{"id":36263,"date":"2019-10-31T22:10:35","date_gmt":"2019-10-31T19:10:35","guid":{"rendered":"https:\/\/prohoster.info\/blog\/aerodisk-engine-katastrofoustojchivost-chast-2-metroklaster\/"},"modified":"2019-10-31T22:10:35","modified_gmt":"2019-10-31T19:10:35","slug":"aerodisk-engine-katastrofoustojchivost-chast-2-metroklaster","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sq\/blog\/administrirovanie\/aerodisk-engine-katastrofoustojchivost-chast-2-metroklaster","title":{"rendered":"AERODISK Engine: Q\u00ebndrueshm\u00ebria ndaj katastrofave. Pjesa 2. Metroklauster","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><img decoding=\"async\" alt=\"AERODISK Engine: Q\u00ebndrueshm\u00ebria ndaj katastrofave. Pjesa 2. Metroklauster\" src=\"\/wp-content\/uploads\/2019\/07\/7671ec455e464b7fe98b0b8ffcd38e24.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>P\u00ebrsh\u00ebndetje, lexues t\u00eb Habr\u00ebs! N\u00eb artikullin e kaluar, ne fol\u00ebm p\u00ebr nj\u00eb mjet t\u00eb thjesht\u00eb p\u00ebr q\u00ebndrueshm\u00ebri n\u00eb sistemet e ruajtjes AERODISK ENGINE \u2013 replikimin. N\u00eb k\u00ebt\u00eb artikull, do t\u00eb shkojm\u00eb te nj\u00eb tem\u00eb m\u00eb t\u00eb nd\u00ebrlikuar dhe interesante \u2013 metroklasteri, q\u00eb \u00ebsht\u00eb nj\u00eb mjet automatizimi p\u00ebr mbrojtjen nga katastrofat p\u00ebr dy qendra t\u00eb t\u00eb dh\u00ebnave, duke lejuar operimin e tyre n\u00eb modin aktiv-aktiv. Do t\u00eb tregojm\u00eb, do t\u00eb shfaqim, do t\u00eb thyem dhe do t\u00eb rregullojm\u00eb.<\/p>\n<p><noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<h2 id=\"kak-obychno-v-nachale-teoriya\">Si zakonisht, n\u00eb fillim teoria<\/h2>\n<p><\/p>\n<p>Metroklasteri \u00ebsht\u00eb nj\u00eb klaster i shp\u00ebrndar\u00eb n\u00eb disa lokacione brenda qytetit ose rajonit. Fjala \"klaster\" na sugjeron qart\u00eb se kompleksi \u00ebsht\u00eb automatizuar, pra kalimi i nyjave t\u00eb klasterit n\u00eb rast defektesh (failover) ndodh automatikisht. <\/p>\n<p><\/p>\n<p>K\u00ebtu ndodhet dallimi kryesor mes metroklasterit dhe replikimit t\u00eb zakonsh\u00ebm. Automatizimi i operacioneve. Dometh\u00ebn\u00eb, n\u00eb rast ngjarjesh t\u00eb ndryshme (d\u00ebshtimi i qendr\u00ebs s\u00eb t\u00eb dh\u00ebnave, nd\u00ebrprerja e kanaleve, etj.), sistemi i ruajtjes do t\u00eb ekzekutoj\u00eb automatikisht veprimet e nevojshme p\u00ebr t\u00eb ruajtur aksesin n\u00eb t\u00eb dh\u00ebna. Me replikat e zakonshme, k\u00ebto veprime realizohen t\u00ebr\u00ebsisht ose pjes\u00ebrisht manualisht nga administratori.<\/p>\n<p><\/p>\n<h3 id=\"dlya-chego-eto-nuzhno\">P\u00ebr \u00e7far\u00eb nevojitet kjo?<\/h3>\n<p><\/p>\n<p>Q\u00ebllimi kryesor q\u00eb ndjekin klient\u00ebt, duke p\u00ebrdorur implementime t\u00eb ndryshme t\u00eb metroklasterit, \u00ebsht\u00eb t\u00eb minimizojn\u00eb RTO (Q\u00ebllimi i Koh\u00ebs s\u00eb Rikuperimit). Dometh\u00ebn\u00eb, t\u00eb minimizojn\u00eb koh\u00ebn e rikuperimit t\u00eb sh\u00ebrbimeve IT pas nj\u00eb d\u00ebshtimi. N\u00ebse p\u00ebrdoret replikimi i zakonsh\u00ebm, koha e rikuperimit do t\u00eb jet\u00eb gjithmon\u00eb m\u00eb e gjat\u00eb se koha e rikuperimit me metroklaster. Pse? Shum\u00eb thjesht\u00eb. Administrator\u00ebt duhet t\u00eb jen\u00eb n\u00eb vendin e pun\u00ebs dhe t\u00eb kalojn\u00eb replikimin manualisht, nd\u00ebrsa metroklasteri e b\u00ebn k\u00ebt\u00eb automatikisht.<\/p>\n<p><\/p>\n<p>N\u00ebse nuk keni nj\u00eb administrator t\u00eb dedikuar q\u00eb nuk fle, nuk ha, nuk pi duhan dhe nuk \u00ebsht\u00eb i s\u00ebmur\u00eb, por q\u00eb 24 or\u00eb n\u00eb dit\u00eb monitoron gjendjen e sistemit t\u00eb ruajtjes, at\u00ebher\u00eb nuk ka mund\u00ebsi t\u00eb garantoni se administratori do t\u00eb jet\u00eb i disponuesh\u00ebm p\u00ebr kalimin manual n\u00eb rast d\u00ebshtimi. <\/p>\n<p><\/p>\n<p>P\u00ebr rrjedhoj\u00eb, RTO n\u00eb rastin e munges\u00ebs s\u00eb metroklasterit ose t\u00eb nj\u00eb administratori t\u00eb pavdekur t\u00eb nivelit 99 do t\u00eb jet\u00eb e barabart\u00eb me shum\u00ebn e koh\u00ebs s\u00eb kalimit t\u00eb t\u00eb gjitha sistemeve dhe intervalin maksimal t\u00eb koh\u00ebs, brenda t\u00eb cilit administratori do t\u00eb filloj\u00eb t\u00eb punoj\u00eb me sistemin e ruajtjes dhe sistemet p\u00ebrkat\u00ebse. <\/p>\n<p><\/p>\n<p>K\u00ebshtu, arrijm\u00eb n\u00eb p\u00ebrfundimin e qart\u00eb se metroklasteri duhet t\u00eb p\u00ebrdoret kur k\u00ebrkesa p\u00ebr RTO \u00ebsht\u00eb minuta, e jo or\u00eb ose dit\u00eb. Dometh\u00ebn\u00eb, kur n\u00eb rastin e r\u00ebnies m\u00eb t\u00eb keqe t\u00eb qendr\u00ebs s\u00eb t\u00eb dh\u00ebnave, departamenti IT duhet t\u00eb siguroj\u00eb biznesit nj\u00eb koh\u00eb rikuperimi t\u00eb aksesit n\u00eb sh\u00ebrbimet IT brenda minutash, ose madje sekondash.<\/p>\n<p><\/p>\n<h3 id=\"kak-eto-rabotaet\">Si funksionon?<\/h3>\n<p><\/p>\n<p>N\u00eb nivelin m\u00eb t\u00eb ul\u00ebt, metroklasteri p\u00ebrdor mekanizmin e replikimit t\u00eb sinkronizuar t\u00eb t\u00eb dh\u00ebnave, t\u00eb cilin e kemi p\u00ebrshkruar n\u00eb artikullin e kaluar (shih. <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/aerodisk\/blog\/456348\/\">link<\/a><\/noindex>). Pasi replikimi \u00ebsht\u00eb i sinkronizuar, at\u00ebher\u00eb k\u00ebrkesat p\u00ebr t\u00eb jan\u00eb p\u00ebrkat\u00ebse, dhe m\u00eb sakt\u00eb:<\/p>\n<p><\/p>\n<ul>\n<li>fibra optike si fizik\u00eb, Ethernet 10 gigabit (ose m\u00eb lart);<\/li>\n<li>distanca nd\u00ebrmjet qendrave t\u00eb t\u00eb dh\u00ebnave nuk duhet t\u00eb jet\u00eb m\u00eb shum\u00eb se 40 kilometra;<\/li>\n<li>vonesa e kanalit optik nd\u00ebrmjet qendrave t\u00eb t\u00eb dh\u00ebnave (nd\u00ebrmjet sistemeve t\u00eb ruajtjes) deri n\u00eb 5 milisekonda (optimalisht 2).<\/li>\n<\/ul>\n<p><\/p>\n<p>T\u00eb gjitha k\u00ebto k\u00ebrkesa jan\u00eb rekomanduese, q\u00eb do t\u00eb thot\u00eb se metroklasteri do t\u00eb funksionoj\u00eb edhe n\u00ebse k\u00ebto k\u00ebrkesa nuk respektohen, por duhet t\u00eb kuptohet se pasojat e mosrespektimit t\u00eb k\u00ebtyre k\u00ebrkesave jan\u00eb ngadal\u00ebsimi i pun\u00ebs s\u00eb t\u00eb dyja sistemeve t\u00eb ruajtjes n\u00eb metroklaster.<\/p>\n<p><\/p>\n<p>Pra, p\u00ebr t\u00eb transferuar t\u00eb dh\u00ebnat nd\u00ebrmjet sistemeve t\u00eb ruajtjes p\u00ebrdoret replikimi sinkron, dhe si kalohen automatikisht replikat dhe m\u00eb e r\u00ebnd\u00ebsishmja, si t\u00eb shmangim split-brain? P\u00ebr k\u00ebt\u00eb, n\u00eb nivelin e m\u00ebparsh\u00ebm p\u00ebrdoret nj\u00eb entitet shtes\u00eb \u2013 arbitri. <\/p>\n<p><\/p>\n<h3 id=\"kak-rabotaet-arbitr-i-v-chem-ego-zadacha\">Si funksionon arbitri dhe cila \u00ebsht\u00eb detyra e tij?<\/h3>\n<p><\/p>\n<p>Arbitri p\u00ebrb\u00ebn nj\u00eb makin\u00eb virtuale t\u00eb vog\u00ebl, ose nj\u00eb klaster hardware q\u00eb duhet t\u00eb aktivizohet n\u00eb nj\u00eb lokacion t\u00eb tret\u00eb (p.sh., n\u00eb zyr\u00eb) dhe t\u00eb siguroj\u00eb akses n\u00eb sistemin e ruajtjes p\u00ebrmes ICMP dhe SSH. Pas aktivizimit, arbitrit do t'i p\u00ebrcaktohet nj\u00eb IP, dhe pastaj nga sistemi i ruajtjes do t\u00eb tregohet adresa e tij, plus adresat e kontrolleve t\u00eb larg\u00ebta q\u00eb marrin pjes\u00eb n\u00eb metroklaster. Pas k\u00ebsaj, arbitri \u00ebsht\u00eb gati p\u00ebr pun\u00eb.<\/p>\n<p><\/p>\n<p>Arbitri kryen monitorimin e vazhduesh\u00ebm t\u00eb t\u00eb gjitha sistemeve t\u00eb ruajtjes n\u00eb metroklaster dhe n\u00eb rast t\u00eb pamund\u00ebsis\u00eb s\u00eb ndonj\u00eb sistemi t\u00eb ruajtjes, ai, pas konfirmimit t\u00eb pamund\u00ebsis\u00eb nga nj\u00eb pjes\u00ebmarr\u00ebs tjet\u00ebr t\u00eb klasterit (nj\u00eb nga sistemet e ruajtjes \"t\u00eb gjalla\"), merr vendimin p\u00ebr fillimin e procedur\u00ebs s\u00eb kalimit t\u00eb rregullave t\u00eb replikimit dhe t\u00eb mapimit.<\/p>\n<p><\/p>\n<p>Nj\u00eb pik\u00eb shum\u00eb e r\u00ebnd\u00ebsishme. Arbitri gjithmon\u00eb duhet t\u00eb gjendet n\u00eb nj\u00eb lokacion t\u00eb ndrysh\u00ebm nga ato ku ndodhen sistemet e ruajtjes, dometh\u00ebn\u00eb as n\u00eb qendr\u00ebn e t\u00eb dh\u00ebnave 1, ku ndodhet sistemi 1, as n\u00eb qendr\u00ebn e t\u00eb dh\u00ebnave 2, ku \u00ebsht\u00eb instaluar sistemi 2. <\/p>\n<p><\/p>\n<p>Pse? Sepse vet\u00ebm k\u00ebshtu arbitri, me ndihm\u00ebn e nj\u00eb prej sistemeve t\u00eb mbijetuara, mund t\u00eb p\u00ebrcaktoj\u00eb qart\u00eb dhe pa gabime r\u00ebnien e ndonj\u00eb prej dy lokacioneve ku jan\u00eb vendosur sistemet e ruajtjes. \u00c7do m\u00ebnyr\u00eb tjet\u00ebr e vendosjes s\u00eb arbitrit mund t\u00eb \u00e7oj\u00eb n\u00eb split-brain. <\/p>\n<p><\/p>\n<h3 id=\"teper-pogruzimsya-v-detali-raboty-arbitra\">Tani tani, le t\u00eb hedhim nj\u00eb v\u00ebshtrim n\u00eb detajet e funksionimit t\u00eb arbitrave.<\/h3>\n<p><\/p>\n<p>Arbitri aktivizon disa sh\u00ebrbime q\u00eb monitorojn\u00eb vazhdimisht t\u00eb gjith\u00eb kontrollor\u00ebt e ruajtjes. N\u00ebse rezultati i monitorimit ndryshon nga i m\u00ebparshmi (i disponuesh\u00ebm \/ i paq\u00ebndrueshem), ai regjistrohet n\u00eb nj\u00eb baz\u00eb t\u00eb vog\u00ebl t\u00eb dh\u00ebnash q\u00eb funksionon gjithashtu n\u00eb arbitr.<\/p>\n<p><\/p>\n<p><strong>Le t\u00eb shqyrtojm\u00eb logjik\u00ebn e funksionimit t\u00eb arbitrave m\u00eb n\u00eb detaje.<\/strong><\/p>\n<p><\/p>\n<p><u>Hapi 1. Identifikimi i pap\u00ebrshtatshm\u00ebris\u00eb.<\/u> Ngjarja sinjalizuese p\u00ebr d\u00ebshtimin e ruajtjes \u00ebsht\u00eb mungesa e ping-ut nga t\u00eb dy kontrollor\u00ebt e nj\u00eb ruajtjeje p\u00ebr 5 sekonda. <\/p>\n<p><\/p>\n<p><u>Hapi 2. Aktivizimi i procedur\u00ebs s\u00eb kalimit. <\/u>Pasi arbitri t\u00eb kuptoj\u00eb se nj\u00eb nga ruajt\u00ebsit \u00ebsht\u00eb i paq\u00ebndruesh\u00ebm, ai d\u00ebrgon nj\u00eb k\u00ebrkes\u00eb tek ruajt\u00ebsi 'i gjall\u00eb' p\u00ebr t'u siguruar se ruajt\u00ebsi 'i vdekur' \u00ebsht\u00eb me t\u00eb v\u00ebrtet\u00eb i vdekur. <\/p>\n<p><\/p>\n<p>Pasi t\u00eb marr\u00eb nj\u00eb komand\u00eb t\u00eb till\u00eb nga arbitri, ruajt\u00ebsi i dyt\u00eb (i gjall\u00eb) kontrollon p\u00ebrs\u00ebri disponueshm\u00ebrin\u00eb e ruajt\u00ebsit t\u00eb par\u00eb q\u00eb ka r\u00ebn\u00eb, dhe n\u00ebse ai nuk \u00ebsht\u00eb i disponuesh\u00ebm, d\u00ebrgon nj\u00eb konfirmim te arbitri p\u00ebr t\u00eb pohuar dyshimin e tij. Ruajt\u00ebsi \u00ebsht\u00eb, me t\u00eb v\u00ebrtet\u00eb, i paq\u00ebndruesh\u00ebm. <\/p>\n<p><\/p>\n<p>Pasi t\u00eb marr\u00eb nj\u00eb konfirmim t\u00eb till\u00eb, arbitri aktivizon procedur\u00ebn e larg\u00ebt p\u00ebr kalimin e replikacionit dhe ngritjen e hart\u00ebs n\u00eb ato replika q\u00eb kan\u00eb qen\u00eb aktive (primary) n\u00eb ruajt\u00ebsin e r\u00ebn\u00eb, dhe d\u00ebrgon nj\u00eb komand\u00eb te ruajt\u00ebsi i dyt\u00eb p\u00ebr t\u2019i b\u00ebr\u00eb k\u00ebto replika nga secondary n\u00eb primary dhe p\u00ebr t\u00eb ngritur hart\u00ebn. Po ashtu, ruajt\u00ebsi i dyt\u00eb, p\u00ebrkat\u00ebsisht, i realizon k\u00ebto procedura, pas t\u00eb cilave siguron aksesin n\u00eb LUN-at e humbura nga ai.<\/p>\n<p><\/p>\n<p>Pse \u00ebsht\u00eb e nevojshme nj\u00eb verifikim shtes\u00eb? P\u00ebr kvorumin. Pra, shumica e numrit t\u00eb \u00e7ifteve (3) t\u00eb pjes\u00ebmarr\u00ebsve n\u00eb grupin e klasterit duhet t\u00eb konfirmojn\u00eb r\u00ebnien e nj\u00eb prej nyjave t\u00eb klasterit. Vet\u00ebm at\u00ebher\u00eb kjo vendimmarrje do t\u00eb ishte e sakt\u00eb. Kjo b\u00ebhet p\u00ebr t\u00eb shmangur kalimin e gabuar dhe, p\u00ebrkat\u00ebsisht, split-brain. <\/p>\n<p><\/p>\n<p>Hapi 2 zgjat rreth 5 \u2013 10 sekonda, k\u00ebshtu q\u00eb, duke marr\u00eb parasysh koh\u00ebn e nevojshme p\u00ebr t\u00eb identifikuar pap\u00ebrshtatshm\u00ebrin\u00eb (5 sekonda), brenda 10 \u2013 15 sekondave pas aksidentit, LUN-at me ruajt\u00ebsin e r\u00ebn\u00eb do t\u00eb jen\u00eb automatikisht t\u00eb disponuesh\u00ebm p\u00ebr t'u punuar me ruajt\u00ebsin e gjall\u00eb. <\/p>\n<p><\/p>\n<p>Natyrisht, p\u00ebr t\u00eb shmangur shk\u00ebputjen e lidhjeve me hostet, \u00ebsht\u00eb e nevojshme t\u00eb sigurohet gjithashtu nj\u00eb konfigurim i sakt\u00eb i skadencave n\u00eb hoste. Skadenca e rekomanduar \u00ebsht\u00eb t\u00eb pakt\u00ebn 30 sekonda. Kjo do t\u00eb parandaloj\u00eb hostin q\u00eb t\u00eb shk\u00ebput\u00eb lidhjen me ruajt\u00ebsin gjat\u00eb kalimit t\u00eb ngarkes\u00ebs n\u00eb rast aksidenti dhe do t\u00eb garantoj\u00eb munges\u00ebn e nd\u00ebrprerjeve n\u00eb input-output.<\/p>\n<p><\/p>\n<blockquote><p>Pauz\u00eb, p\u00ebrkthehet se n\u00ebse metroklasteri \u00ebsht\u00eb kaq i mir\u00eb, pse nevojitet ndonj\u00ebher\u00eb replikim i zakonsh\u00ebm? <\/p><\/blockquote>\n<p>N\u00eb fakt, gj\u00ebrat nuk jan\u00eb aq t\u00eb thjeshta. <\/p>\n<p><\/p>\n<h3 id=\"rassmotrim-plyusy-i-minusy-metroklastera\">Le t\u00eb shqyrtojm\u00eb p\u00ebrfitimet dhe disavantazhet e metroklasterit.<\/h3>\n<p><\/p>\n<p>Pra, kemi kuptuar se p\u00ebrfitimet evidente t\u00eb metroklasterit krahasuar me replikimin e zakonsh\u00ebm jan\u00eb:<\/p>\n<p><\/p>\n<ul>\n<li>Automatizimi i plot\u00eb, i cili garanton koh\u00eb minimale rikuperimi n\u00eb rast katastrofe;<\/li>\n<li>Dhe kjo \u00ebsht\u00eb gjith\u00e7ka :-).<\/li>\n<\/ul>\n<p><\/p>\n<p>Tani, vini re disavantazhet:<\/p>\n<p><\/p>\n<ul>\n<li>Kostoja e zgjidhjes. Edhe pse metroklasteri n\u00eb sistemet Aerodisk nuk k\u00ebrkon licenc\u00eb shtes\u00eb (po p\u00ebrdoret e nj\u00ebjta licenc\u00eb si p\u00ebr replik\u00ebn), kostoja e zgjidhjes do t\u00eb jet\u00eb ende m\u00eb e lart\u00eb se p\u00ebrdorimi i replikimit sinkron. Duhet t\u00eb realizohen t\u00eb gjitha k\u00ebrkesat p\u00ebr replikim sinkron, plus k\u00ebrkesat e metroklasterit q\u00eb lidhen me komunikim shtes\u00eb dhe nj\u00eb platform\u00eb t\u00eb tret\u00eb (shih planifikimin e metroklasterit);<\/li>\n<li>Kompleksiteti i zgjidhjes. Metroklasteri \u00ebsht\u00eb nd\u00ebrtuar n\u00eb m\u00ebnyr\u00eb q\u00eb t\u00eb jet\u00eb shum\u00eb m\u00eb kompleks se nj\u00eb replik i zakonsh\u00ebm dhe k\u00ebrkon shum\u00eb m\u00eb tep\u00ebr v\u00ebmendje dhe p\u00ebrpjekje p\u00ebr planifikim, konfigurim dhe dokumentacion.<\/li>\n<\/ul>\n<p><\/p>\n<p>Si p\u00ebrfundim. <strong>Metroklasteri \u00ebsht\u00eb, pa dyshim, nj\u00eb zgjidhje shum\u00eb teknologjike dhe e mir\u00eb, kur ju nevojitet q\u00eb t\u00eb garantoni RTO n\u00eb sekonda ose minuta.<\/strong> Por n\u00ebse nj\u00eb detyr\u00eb e till\u00eb nuk ekziston, dhe RTO n\u00eb or\u00eb \u00ebsht\u00eb n\u00eb rregull p\u00ebr biznesin, at\u00ebher\u00eb nuk ka kuptim t\u00eb p\u00ebrdoret nj\u00eb arm\u00eb p\u00ebr t\u00eb gjuajtur shqiponjat. Mjafton nj\u00eb replikim i zakonsh\u00ebm pun\u00ebtor\u00ebsh, sepse metroklasteri do t\u00eb shkaktoj\u00eb shpenzime shtes\u00eb dhe do t\u00eb komplikoj\u00eb infrastruktur\u00ebn IT.<\/p>\n<p><\/p>\n<h2 id=\"planirovanie-metroklastera\">Planifikimi i metroklasterit.<\/h2>\n<p><\/p>\n<p>Ky seksion nuk pretendon t\u00eb jet\u00eb nj\u00eb udh\u00ebzues gjith\u00ebp\u00ebrfshir\u00ebs p\u00ebr projektimin e metroklasterit, por thjesht tregon drejtimet kryesore q\u00eb duhet t\u00eb studiohen n\u00ebse keni vendosur t\u00eb nd\u00ebrtoni nj\u00eb sistem t\u00eb till\u00eb. Prandaj, kur implementoni nj\u00eb metroklaster, sigurohuni t\u00eb p\u00ebrfshini p\u00ebr konsultime prodhuesin e ruajtjes (dometh\u00ebn\u00eb ne) dhe sistemet e tjera p\u00ebrkat\u00ebse.<\/p>\n<p><\/p>\n<h3 id=\"ploschadki\">Platformat.<\/h3>\n<p><\/p>\n<p>Si\u00e7 p\u00ebrmendet m\u00eb sip\u00ebr, p\u00ebr elektroklasterin k\u00ebrkojn\u00eb t\u00eb pakt\u00ebn tri platforma. Dy Qendra t\u00eb Dh\u00ebnash, ku do t\u00eb punojn\u00eb ruajt\u00ebsit dhe sistemet p\u00ebrkat\u00ebse, si dhe nj\u00eb platform\u00eb t\u00eb tret\u00eb, ku do t\u00eb funksionoj\u00eb arbitri.<\/p>\n<p><\/p>\n<p>Distanca e rekomanduar midis Qendrave t\u00eb t\u00eb Dh\u00ebnave nuk duhet t\u00eb kaloj\u00eb 40 kilometra. Nj\u00eb distanc\u00eb m\u00eb e madhe do t\u00eb sjell\u00eb me shum\u00eb gjas\u00eb vonesa shtes\u00eb, t\u00eb cilat n\u00eb rastin e metrokasterit jan\u00eb jasht\u00ebzakonisht t\u00eb pad\u00ebshirueshme. T\u00eb kujtojm\u00eb, vonesat duhet t\u00eb jen\u00eb deri n\u00eb 5 milisekonda, megjithat\u00eb \u00ebsht\u00eb e preferueshme t\u00eb gjojm\u00eb brenda 2.<\/p>\n<p><\/p>\n<p>Rekomandohet t\u00eb kontrolloni vonesat edhe gjat\u00eb planifikimit. \u00c7do ofrues m\u00eb shum\u00eb ose m\u00eb pak i avancuar, q\u00eb ofron fibra optike midis Qendrave t\u00eb t\u00eb Dh\u00ebnave, mund t\u00eb organizoj\u00eb nj\u00eb kontroll cil\u00ebsor mjaft shpejt. <\/p>\n<p><\/p>\n<p>Sa i p\u00ebrket vonesave deri te arbitri (pra midis platform\u00ebs s\u00eb tret\u00eb dhe dy t\u00eb parave), pragu i rekomanduar i vonesave \u00ebsht\u00eb deri n\u00eb 200 milisekonda, pra nj\u00eb lidhje e zakonshme VPN korporative mbi Internetin do t\u00eb ishte e p\u00ebrshtatshme.<\/p>\n<p><\/p>\n<h3 id=\"kommutaciya-i-set\">\u00c7far\u00eb lidhjeje dhe rrjeti<\/h3>\n<p><\/p>\n<p>N\u00eb dallim nga skema me replikim, ku mjafton t\u00eb lidhni sistemet e ruajtjes nga platforma t\u00eb ndryshme, skema me metrokasterin k\u00ebrkon lidhjen e hosteve me t\u00eb dy sistemet e ruajtjes n\u00eb platforma t\u00eb ndryshme. P\u00ebr ta b\u00ebr\u00eb m\u00eb t\u00eb qart\u00eb diferenc\u00ebn, t\u00eb dy skemat jan\u00eb treguar m\u00eb posht\u00eb.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"AERODISK Engine: Q\u00ebndrueshm\u00ebria ndaj katastrofave. Pjesa 2. Metroklauster\" src=\"\/wp-content\/uploads\/2019\/07\/12334c29a498f686e8eb946daab587c1.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"AERODISK Engine: Q\u00ebndrueshm\u00ebria ndaj katastrofave. Pjesa 2. Metroklauster\" src=\"\/wp-content\/uploads\/2019\/07\/46db8c81d15be3f89e1f9dbee4489e3b.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>Si\u00e7 mund t\u00eb shihet nga skema, hostet e platform\u00ebs s\u00eb par\u00eb shikojn\u00eb si n\u00eb sistemin e ruajtjes 1, ashtu edhe n\u00eb sistemin e ruajtjes 2. Po ashtu, n\u00eb m\u00ebnyr\u00eb t\u00eb kund\u00ebrt, hostet e platform\u00ebs s\u00eb dyt\u00eb shikojn\u00eb si n\u00eb sistemin e ruajtjes 2 ashtu edhe n\u00eb sistemin e ruajtjes 1. Pra, \u00e7do host e sheh t\u00eb dy sistemet e ruajtjes. Ky \u00ebsht\u00eb nj\u00eb kusht i domosdosh\u00ebm p\u00ebr funksionimin e metrokasterit.<\/p>\n<p><\/p>\n<p>Natyrisht, nuk ka nevoj\u00eb q\u00eb \u00e7do host t\u00eb \u00e7oj\u00eb nj\u00eb kabllo optike n\u00eb Qendr\u00ebn e t\u00eb Dh\u00ebnave tjet\u00ebr, pasi nuk do t\u00eb mjaftonin portet dhe kabllot. T\u00eb gjitha k\u00ebto lidhje duhet t\u00eb realizohen p\u00ebrmes switch-ev Ethernet 10G+ ose FibreChannel 8G+ (FC vet\u00ebm p\u00ebr lidhjen midis hosteve dhe sistemit t\u00eb ruajtjes p\u00ebr IO, kanali i replikimit aktualisht \u00ebsht\u00eb i arritsh\u00ebm vet\u00ebm n\u00ebp\u00ebrmjet IP (Ethernet 10G+). <\/p>\n<p><\/p>\n<p>Tani disa fjal\u00eb mbi topologjin\u00eb e rrjetit. Nj\u00eb pik\u00eb e r\u00ebnd\u00ebsishme \u00ebsht\u00eb konfigurimi i sakt\u00eb i subnet-eve. Duhet t\u00eb p\u00ebrcaktohen menj\u00ebher\u00eb disa subnet-e p\u00ebr lloje t\u00eb ndryshme trafikesh:<\/p>\n<p><\/p>\n<ul>\n<li>Subnete p\u00ebr replikim, n\u00ebp\u00ebrmjet t\u00eb cilave do t\u00eb sinkronizohen t\u00eb dh\u00ebnat mes sistemeve t\u00eb ruajtjes. Mund t\u00eb ket\u00eb disa, n\u00eb k\u00ebt\u00eb rast nuk ka r\u00ebnd\u00ebsi, gjith\u00e7ka varet nga topologjia aktuale (e realizuar tashm\u00eb) e rrjetit. N\u00ebse ka dy, at\u00ebher\u00eb, natyrisht, duhet t\u00eb konfigurohet ruterimi midis tyre;<\/li>\n<li>Subnete p\u00ebr ruajtjen e t\u00eb dh\u00ebnave, p\u00ebrmes t\u00eb cilave hostet do t\u00eb ken\u00eb qasje n\u00eb burimet e sistemit t\u00eb ruajtjes (n\u00ebse \u00ebsht\u00eb iSCSI). Duhet t\u00eb ket\u00eb nga nj\u00eb n\u00eb \u00e7do Qend\u00ebr t\u00eb t\u00eb Dh\u00ebnave;<\/li>\n<li>Subnete menaxhuese, pra tri subnete q\u00eb mund t\u00eb ruterizohen n\u00eb tri platforma, nga t\u00eb cilat realizohet menaxhimi i sistemit t\u00eb ruajtjes, dhe gjithashtu aty ndodhet arbitri.<\/li>\n<\/ul>\n<p><\/p>\n<p>Subnetet p\u00ebr qasje n\u00eb burimet e hosteve nuk i shqyrtojm\u00eb k\u00ebtu, pasi ato varen shum\u00eb nga detyrat. <\/p>\n<p><\/p>\n<p>Ndarja e trafik\u00ebve t\u00eb ndrysh\u00ebm n\u00eb subnet-e t\u00eb ndryshme \u00ebsht\u00eb shum\u00eb e r\u00ebnd\u00ebsishme (sidomos \u00ebsht\u00eb e r\u00ebnd\u00ebsishme q\u00eb t\u00eb ndahet replikimi nga input-output), sepse n\u00ebse e bashkoni t\u00eb gjith\u00eb trafikun n\u00eb nj\u00eb subnet \"t\u00eb trash\u00eb\", at\u00ebher\u00eb nuk do t\u00eb jet\u00eb e mundur t\u00eb menaxhoni k\u00ebt\u00eb trafik, dhe n\u00eb kushtet e dy Qendrave t\u00eb t\u00eb Dh\u00ebnave, mund t\u00eb shkaktoj\u00eb variante t\u00eb ndryshme t\u00eb p\u00ebrplasjeve rrjet\u00ebrore. N\u00eb k\u00ebt\u00eb \u00e7\u00ebshtje, n\u00eb kuad\u00ebr t\u00eb k\u00ebtij artikulli nuk do t\u00eb thellohemi shum\u00eb, pasi p\u00ebr planifikimin e nj\u00eb rrjeti t\u00eb shtrir\u00eb midis Qendrave t\u00eb t\u00eb Dh\u00ebnave mund t\u00eb liremni n\u00eb burime t\u00eb prodhuesve t\u00eb pajisjeve rrjet\u00ebrore, ku \u00ebsht\u00eb p\u00ebrshkruar shum\u00eb holl\u00ebsisht.<\/p>\n<p><\/p>\n<h3 id=\"konfiguraciya-arbitra\">Konfigurimi i arbitrit<\/h3>\n<p><\/p>\n<p>Arbitrit i duhet t\u00eb siguroj\u00eb akses n\u00eb t\u00eb gjitha nd\u00ebrfaqet menaxhuese t\u00eb sistemit t\u00eb ruajtjes p\u00ebrmes protokolleve ICMP dhe SSH. Gjithashtu, duhet t\u00eb mendohet p\u00ebr q\u00ebndrueshm\u00ebrin\u00eb e arbitrit. K\u00ebtu ka nj\u00eb \u00e7\u00ebshtje.<\/p>\n<p><\/p>\n<p>Q\u00ebndrueshm\u00ebria e arbitrit \u00ebsht\u00eb shum\u00eb e d\u00ebshirueshme, por jo e detyrueshme. \u00c7far\u00eb do t\u00eb ndodh\u00eb n\u00ebse arbitri shembet n\u00eb momentin e gabuar?<\/p>\n<p><\/p>\n<ul>\n<li>Funksionimi i metrokasterit n\u00eb m\u00ebnyr\u00eb t\u00eb rregullt nuk do t\u00eb ndryshoj\u00eb, pasi arbitri nuk ndikon aspak n\u00eb funksionimin e metrokasterit n\u00eb m\u00ebnyr\u00ebn e tij t\u00eb zakonshme (detyra e tij \u00ebsht\u00eb t\u00eb kaloj\u00eb n\u00eb koh\u00eb ngarkes\u00ebn midis Qendrave t\u00eb t\u00eb Dh\u00ebnave)<\/li>\n<li>Megjithat\u00eb, n\u00ebse arbitri bie p\u00ebr nj\u00eb arsye ose nj\u00eb tjet\u00ebr dhe \"faton\" nj\u00eb emergjenc\u00eb n\u00eb Qendr\u00ebn e t\u00eb Dh\u00ebnave, at\u00ebher\u00eb nuk do t\u00eb ket\u00eb asnj\u00eb kalim, sepse nuk ka ask\u00ebnd q\u00eb t\u00eb jap\u00eb komandat e nevojshme p\u00ebr kalim dhe t\u00eb organizoj\u00eb kuorum. N\u00eb k\u00ebt\u00eb rast, metrokasteri do t\u00eb shnd\u00ebrrohet n\u00eb nj\u00eb skem\u00eb t\u00eb zakonshme me replikim, t\u00eb cil\u00ebn do t\u00eb duhet ta kalosh manualisht gjat\u00eb katastrof\u00ebs, e cila do t\u00eb ndikoj\u00eb n\u00eb RTO.<\/li>\n<\/ul>\n<p><\/p>\n<p>\u00c7far\u00eb vjen m\u00eb pas? N\u00ebse n\u00eb t\u00eb v\u00ebrtet\u00eb duhet t\u00eb sigurosh nj\u00eb nivel minimal t\u00eb RTO, duhet t\u00eb sigurosh q\u00ebndrueshm\u00ebrin\u00eb e arbitrit. P\u00ebr k\u00ebt\u00eb ka dy opsione:<\/p>\n<p><\/p>\n<ul>\n<li>T\u00eb nisin nj\u00eb makin\u00eb virtuale me arbitrin n\u00eb nj\u00eb hipervizor t\u00eb q\u00ebndruesh\u00ebm, pasi t\u00eb gjitha hipervizor\u00ebt e avancuar mb\u00ebshtesin q\u00ebndrueshm\u00ebrin\u00eb;<\/li>\n<li>N\u00ebse n\u00eb platform\u00ebn e tret\u00eb (n\u00eb nj\u00eb zyr\u00eb hipotetike) \u00ebsht\u00eb e v\u00ebshtir\u00eb t\u00eb vendos\u00ebsh nj\u00eb klaster t\u00eb mir\u00eb, nuk ka asnj\u00eb klaster ekzistues hipervizor\u00ebsh, ne kemi parapar\u00eb nj\u00eb variant harduerik t\u00eb arbitrit, i cili \u00ebsht\u00eb realizuar n\u00eb nj\u00eb kuti 2U, n\u00eb t\u00eb cil\u00ebn punojn\u00eb dy servera t\u00eb zakonsh\u00ebm x-86 dhe q\u00eb mund t\u00eb p\u00ebrballoj\u00eb nj\u00eb d\u00ebshtim lokal.<\/li>\n<\/ul>\n<p><\/p>\n<p>Ne rekomandojm\u00eb n\u00eb m\u00ebnyr\u00eb t\u00eb ngjashme t\u00eb sigurohet q\u00eb arbitri t\u00eb jet\u00eb i q\u00ebndruesh\u00ebm, pavar\u00ebsisht se n\u00eb m\u00ebnyr\u00eb normale nuk \u00ebsht\u00eb i nevojsh\u00ebm p\u00ebr metrokasterin. Por si\u00e7 tregon teoria dhe praktika, n\u00ebse d\u00ebshirojm\u00eb t\u00eb krijojm\u00eb nj\u00eb infrastruktur\u00eb t\u00eb v\u00ebrtet\u00eb t\u00eb besueshme ndaj katastrofave, \u00ebsht\u00eb m\u00eb mir\u00eb t\u00eb mbrohemi. M\u00eb mir\u00eb t\u00eb mbrojm\u00eb veten dhe biznesin nga 'ligji i mjerimit', q\u00eb do t\u00eb thot\u00eb nga d\u00ebshtimi i papritur t\u00eb arbitrit dhe nj\u00eb nga platformat ku ndodhet SCSI.<\/p>\n<p><\/p>\n<h3 id=\"arhitektura-resheniya\">Arkitektura e zgjidhjes<\/h3>\n<p><\/p>\n<p>Duke marr\u00eb parasysh k\u00ebrkesat e m\u00ebsip\u00ebrme, ne arrijm\u00eb n\u00eb arkitektur\u00ebn e p\u00ebrgjithshme t\u00eb zgjidhjes.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"AERODISK Engine: Q\u00ebndrueshm\u00ebria ndaj katastrofave. Pjesa 2. Metroklauster\" src=\"\/wp-content\/uploads\/2019\/07\/e60f67d6705d940f1c06b06328bf99a5.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>LUN-et duhet t\u00eb shp\u00ebrndahen n\u00eb m\u00ebnyr\u00eb t\u00eb barabart\u00eb midis dy platformave p\u00ebr t\u00eb shmangur ngarkes\u00ebn e madhe. N\u00eb t\u00eb nj\u00ebjt\u00ebn koh\u00eb, gjat\u00eb analiz\u00ebs s\u00eb sizimit n\u00eb t\u00eb dyja Qendrat e t\u00eb Dh\u00ebnave, duhet t\u00eb parashikohet jo vet\u00ebm dyfishi i v\u00ebllimit (i nevojsh\u00ebm p\u00ebr ruajtjen e t\u00eb dh\u00ebnave n\u00eb t\u00eb dy SCSI-t\u00eb), por edhe dyfishi i performanc\u00ebs n\u00eb IOPS dhe MB\/s, p\u00ebr t\u00eb shmangur degradimin e aplikacioneve n\u00eb kushtet e d\u00ebshtimit t\u00eb nj\u00eb nga Qendrat e t\u00eb Dh\u00ebnave.<\/p>\n<p><\/p>\n<p>Dua t\u00eb theksoj se me nj\u00eb qasje t\u00eb duhur n\u00eb sizim (dmth, duke siguruar kufijt\u00eb e nevojsh\u00ebm t\u00eb IOPS dhe MB\/s, si dhe burimet e nevojshme t\u00eb CPU dhe RAM) gjat\u00eb d\u00ebshtimit t\u00eb nj\u00eb nga SCSI-t\u00eb n\u00eb metrokaster, nuk do t\u00eb ket\u00eb nj\u00eb r\u00ebnie t\u00eb r\u00ebnd\u00ebsishme t\u00eb performanc\u00ebs kur punojm\u00eb me nj\u00eb SCSI.<\/p>\n<p><\/p>\n<p>Kjo shpikohet nga fakti se gjat\u00eb pun\u00ebs s\u00eb dy platformave, replikimi sinqyr q\u00eb funksionon 'han' gjysm\u00ebn e performanc\u00ebs gjat\u00eb shkrimit, sepse \u00e7do transaksion duhet t\u00eb regjistrohet n\u00eb dy SCSI (si RAID-1\/10). Pra, gjat\u00eb d\u00ebshtimit t\u00eb nj\u00eb nga SCSI-t\u00eb, ndikimi i replikimit p\u00ebrkoh\u00ebsisht (deri sa t\u00eb riparohen SCSI-t\u00eb e d\u00ebshtuar) zhduket dhe ne marrim nj\u00eb rritje dyfish t\u00eb performanc\u00ebs p\u00ebr shkrim. Pas q\u00eb LUN-et e SCSI-t t\u00eb d\u00ebshtuar t\u00eb rindez ven\u00eb n\u00eb SCSI-n\u00eb e pun\u00ebs, kjo rritje dyfish do t\u00eb zhduket nga ngarkesa e LUN-eve t\u00eb SCSI-t tjet\u00ebr, dhe ne kthehemi n\u00eb nivelin e nj\u00ebjt\u00eb t\u00eb performanc\u00ebs q\u00eb kishim para 'd\u00ebshtimit', por vet\u00ebm n\u00eb kuad\u00ebr t\u00eb nj\u00eb platforme. <\/p>\n<p><\/p>\n<p>Me nj\u00eb sizim t\u00eb men\u00e7ur, mund t\u00eb sigurojm\u00eb kushte, n\u00eb t\u00eb cilat d\u00ebshtimi i nj\u00eb t\u00ebr\u00eb SCSI nuk do t\u00eb ndjehet fare nga p\u00ebrdoruesit. Por p\u00ebrs\u00ebri, kjo k\u00ebrkon nj\u00eb sizim shum\u00eb t\u00eb kujdessh\u00ebm, p\u00ebr t\u00eb cilin, me t\u00eb v\u00ebrtet\u00eb, mund t\u00eb na kontaktoni pa pages\u00eb :-).<\/p>\n<p><\/p>\n<h2 id=\"nastroyka-metroklastera\">Konfigurimi i metrokasterit<\/h2>\n<p><\/p>\n<p>Konfigurimi i metrokasterit \u00ebsht\u00eb shum\u00eb i ngjash\u00ebm me konfigurimin e replikimit t\u00eb zakonsh\u00ebm, q\u00eb e p\u00ebrshkruam n\u00eb <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/aerodisk\/blog\/456348\/\">artikulli i m\u00ebparsh\u00ebm<\/a><\/noindex>. Prandaj, do t\u00eb p\u00ebrqendrohemi vet\u00ebm n\u00eb dallimet. Ne kemi konfiguruar n\u00eb laboratorin ton\u00eb nj\u00eb q\u00ebndrim, t\u00eb bazuar n\u00eb arkitektur\u00ebn e m\u00ebsip\u00ebrme, n\u00eb versionin minimal: dy SCSI, t\u00eb lidhura p\u00ebrmes 10G Ethernet midis tyre, dy switch-e 10G dhe nj\u00eb host, i cili shikon p\u00ebrmes switcheve t\u00eb dy SCSI me porte 10G. Arbitri funksionon n\u00eb nj\u00eb makin\u00eb virtuale.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"AERODISK Engine: Q\u00ebndrueshm\u00ebria ndaj katastrofave. Pjesa 2. Metroklauster\" src=\"\/wp-content\/uploads\/2019\/07\/04e318609929553ed651fd702f0c7327.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>Kur konfigurojm\u00eb VIP (IP virtuale) p\u00ebr replikat, duhet t\u00eb zgjedhim llojin e VIP - p\u00ebr metrokaster.<\/p>\n<p><\/p>\n<p><noindex><a rel=\"nofollow\" href=\"https:\/\/habrastorage.org\/webt\/ym\/aw\/89\/ymaw89gofhplngagm5nvveg4oe0.png\"><img decoding=\"async\" alt=\"AERODISK Engine: Q\u00ebndrueshm\u00ebria ndaj katastrofave. Pjesa 2. Metroklauster\" src=\"\/wp-content\/uploads\/2019\/07\/974acf7aad3244c48049d09ff9b99a52.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/p>\n<p><\/p>\n<p>Kemi krijuar dy lidhje replikimi p\u00ebr dy LUN-et dhe i kemi shp\u00ebrndar\u00eb ato n\u00eb dy SCSI: LUN TEST Primary n\u00eb SCSI1 (lidhja METRO), LUN TEST2 Primary p\u00ebr SCSI2 (lidhja METRO2).<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"AERODISK Engine: Q\u00ebndrueshm\u00ebria ndaj katastrofave. Pjesa 2. Metroklauster\" src=\"\/wp-content\/uploads\/2019\/07\/7ff6c2bcf23bfa48974ba3ae5538e424.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>P\u00ebr to kemi konfiguruar dy targeta t\u00eb nj\u00ebjt\u00eb (n\u00eb rastin ton\u00eb iSCSI, por p\u00ebrkrahim edhe FC, logjika e konfigurimit \u00ebsht\u00eb e nj\u00ebjt\u00eb).<\/p>\n<p><\/p>\n<p>SCSI1:<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"AERODISK Engine: Q\u00ebndrueshm\u00ebria ndaj katastrofave. Pjesa 2. Metroklauster\" src=\"\/wp-content\/uploads\/2019\/07\/e8378f8a65ea7886d9bf0b97b76394c4.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>SCSI2:<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"AERODISK Engine: Q\u00ebndrueshm\u00ebria ndaj katastrofave. Pjesa 2. Metroklauster\" src=\"\/wp-content\/uploads\/2019\/07\/dee6c339ff0b15ec24f8d2d19d874921.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>P\u00ebr lidhjet e replikimit kemi b\u00ebr\u00eb mapimet n\u00eb \u00e7do SCSI.<\/p>\n<p><\/p>\n<p>SCSI1:<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"AERODISK Engine: Q\u00ebndrueshm\u00ebria ndaj katastrofave. Pjesa 2. Metroklauster\" src=\"\/wp-content\/uploads\/2019\/07\/c71dcc46058731acb7fdf44a2ae52f56.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>SCSI2:<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"AERODISK Engine: Q\u00ebndrueshm\u00ebria ndaj katastrofave. Pjesa 2. Metroklauster\" src=\"\/wp-content\/uploads\/2019\/07\/f473a0862ccb11d55ff1b1f13d5db87e.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>Konfiguruam multipath dhe e prezantuam n\u00eb host.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"AERODISK Engine: Q\u00ebndrueshm\u00ebria ndaj katastrofave. Pjesa 2. Metroklauster\" src=\"\/wp-content\/uploads\/2019\/07\/e3eea3967f75388cf5bd5aeb8ec4f5df.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"AERODISK Engine: Q\u00ebndrueshm\u00ebria ndaj katastrofave. Pjesa 2. Metroklauster\" src=\"\/wp-content\/uploads\/2019\/07\/20ce2c6f94a1ec507704b2adabe7f7fa.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<h3 id=\"nastraivaem-arbitra\">Konfigurojm\u00eb arbitrin<\/h3>\n<p><\/p>\n<p>Me arbitrin vet\u00eb nuk ka shum\u00eb p\u00ebr t\u00eb b\u00ebr\u00eb, duhet thjesht ta aktivizoni n\u00eb platform\u00ebn e tret\u00eb, t\u00eb caktoni IP-n\u00eb dhe t\u00eb konfigurojm\u00eb qasjen p\u00ebr ICMP dhe SSH. Vet\u00eb konfigurimi b\u00ebhet nga SCSI-t\u00eb. N\u00eb t\u00eb nj\u00ebjt\u00ebn koh\u00eb, konfigurojm\u00eb arbitrin mjafton t\u00eb b\u00ebhet nj\u00eb her\u00eb n\u00eb cilindo nga kontrollet e SCSI-n\u00eb n\u00eb metrokaster, k\u00ebto cil\u00ebsime do t\u00eb shtrihen automatikisht n\u00eb t\u00eb gjith\u00eb kontrollet.<\/p>\n<p><\/p>\n<p>N\u00eb seksionin Replikimi i Udh\u00ebs&gt;&gt; Metrokaster (n\u00eb cilindo kontrollor)&gt;&gt; butoni \"Konfiguro\".<\/p>\n<p><\/p>\n<p><noindex><a rel=\"nofollow\" href=\"https:\/\/habrastorage.org\/webt\/sy\/h0\/x-\/syh0x-gywrz2yu8w9mk0us5mwcg.jpeg\"><img decoding=\"async\" alt=\"AERODISK Engine: Q\u00ebndrueshm\u00ebria ndaj katastrofave. Pjesa 2. Metroklauster\" src=\"\/wp-content\/uploads\/2019\/07\/c83c1dd267dcbe0203af23e2f10772c4.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/p>\n<p><\/p>\n<p>Futni IP-n\u00eb e arbitrit, si dhe nd\u00ebrfaqet e menaxhimit t\u00eb dy kontrolleve t\u00eb SCSI t\u00eb larg\u00ebt.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"AERODISK Engine: Q\u00ebndrueshm\u00ebria ndaj katastrofave. Pjesa 2. Metroklauster\" src=\"\/wp-content\/uploads\/2019\/07\/760f6f703f5f0eef1072c4c6ca393089.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>Pas k\u00ebsaj duhet t\u00eb aktivizoni t\u00eb gjitha sh\u00ebrbimet (butoni \"Rinisni gjith\u00e7ka\"). N\u00eb rastin e ri-konfigurimi n\u00eb t\u00eb ardhmen, do t\u00eb nevojitet t\u00eb rinisni sh\u00ebrbimet, p\u00ebr t'u siguruar q\u00eb cil\u00ebsimet t\u00eb hyjn\u00eb n\u00eb fuqi.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"AERODISK Engine: Q\u00ebndrueshm\u00ebria ndaj katastrofave. Pjesa 2. Metroklauster\" src=\"\/wp-content\/uploads\/2019\/07\/ad25df4a17879bcddb45480368c51095.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>Kontrollojm\u00eb q\u00eb t\u00eb gjitha sh\u00ebrbimet jan\u00eb aktivizuar.<\/p>\n<p><\/p>\n<p><noindex><a rel=\"nofollow\" href=\"https:\/\/habrastorage.org\/webt\/oh\/mw\/xl\/ohmwxl5jry0dufgfamey0ddxris.jpeg\"><img decoding=\"async\" alt=\"AERODISK Engine: Q\u00ebndrueshm\u00ebria ndaj katastrofave. Pjesa 2. Metroklauster\" src=\"\/wp-content\/uploads\/2019\/07\/15b658834b7682c6cc3b76882ad9e4ab.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/p>\n<p><\/p>\n<p><strong>K\u00ebshtu, konfigurimi i metrokasterit p\u00ebrfundon.<\/strong><\/p>\n<p><\/p>\n<h2 id=\"krash-test\">Testimi i d\u00ebshtimit<\/h2>\n<p><\/p>\n<p>Testimi i d\u00ebshtimit n\u00eb rastin ton\u00eb do t\u00eb jet\u00eb mjaft i thjesht\u00eb dhe i shpejt\u00eb, pasi funksionaliteti i replikimit (kalimi, konsistenca etj.) \u00ebsht\u00eb trajtuar n\u00eb <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/aerodisk\/blog\/456348\/\">artikullin e kaluar.<\/a><\/noindex>. Pra, p\u00ebr t\u00eb provuar besueshm\u00ebrin\u00eb e metrokasterit, mjafton t\u00eb kontrollojm\u00eb automatizimin e identifikimit t\u00eb d\u00ebshtimit, kalimin dhe munges\u00ebn e humbjeve gjat\u00eb shkrimit (ndalimi i hyrjes dhe daljes). <\/p>\n<p><\/p>\n<p>P\u00ebr k\u00ebt\u00eb, ne simullojm\u00eb nj\u00eb d\u00ebshtim t\u00eb plot\u00eb t\u00eb nj\u00eb SCSI, duke e fikur fizikisht t\u00eb dy kontrollor\u00ebt e saj, duke nisur m\u00eb par\u00eb kopjimin e nj\u00eb file t\u00eb madh n\u00eb LUN, i cili duhet t\u00eb aktivizohet n\u00eb SCSI-n\u00eb tjet\u00ebr.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"AERODISK Engine: Q\u00ebndrueshm\u00ebria ndaj katastrofave. Pjesa 2. Metroklauster\" src=\"\/wp-content\/uploads\/2019\/07\/b1b108313472a03983bc1b8690c70369.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>Nd\u00ebrpresim nj\u00eb SHTD. N\u00eb SHTD-n\u00eb e dyt\u00eb shohim alerte dhe mesazhe n\u00eb log, q\u00eb tregojn\u00eb se lidhja me sistemin fqinj \u00ebsht\u00eb humbur. N\u00ebse jan\u00eb t\u00eb konfiguruara njoftimet p\u00ebrmes SMTP ose SNMP monitorimi, administratori do t\u00eb marr\u00eb njoftimet p\u00ebrkat\u00ebse.<\/p>\n<p><\/p>\n<p><noindex><a rel=\"nofollow\" href=\"https:\/\/habrastorage.org\/webt\/ae\/jo\/xv\/aejoxv6piwk4fvl-nc1leklbxce.jpeg\"><img decoding=\"async\" alt=\"AERODISK Engine: Q\u00ebndrueshm\u00ebria ndaj katastrofave. Pjesa 2. Metroklauster\" src=\"\/wp-content\/uploads\/2019\/07\/9af3728eec93cc2e17048ec596748cb1.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/p>\n<p><\/p>\n<p>Sikur t\u00eb kalojn\u00eb 10 sekonda (duket n\u00eb t\u00eb dyja screenshot-et) lidhja e replikimit METRO (ajo, q\u00eb ishte Primary n\u00eb SHTD-n\u00eb q\u00eb ra) automatikisht u b\u00eb Primary n\u00eb SHTD-n\u00eb q\u00eb funksionon. Duke p\u00ebrfituar nga hartimi ekzistues, LUN TEST mbeti i aksesuesh\u00ebm p\u00ebr host-in, shkrimi ra pak (brenda 10% t\u00eb premtuar), por nuk u nd\u00ebrpre. <\/p>\n<p><\/p>\n<p><noindex><a rel=\"nofollow\" href=\"https:\/\/habrastorage.org\/webt\/v_\/gj\/d9\/v_gjd9sgoi5hwrgjdkwxwtdomeu.jpeg\"><img decoding=\"async\" alt=\"AERODISK Engine: Q\u00ebndrueshm\u00ebria ndaj katastrofave. Pjesa 2. Metroklauster\" src=\"\/wp-content\/uploads\/2019\/07\/e0131eb534ed10f1ac64a19d42d0b53f.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"AERODISK Engine: Q\u00ebndrueshm\u00ebria ndaj katastrofave. Pjesa 2. Metroklauster\" src=\"\/wp-content\/uploads\/2019\/07\/644da1a8b2de75637b58094f549d4de0.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p><strong>Testi p\u00ebrfundoi me sukses.<\/strong><\/p>\n<p><\/p>\n<h2 id=\"podvodim-itog\">T\u00eb p\u00ebrmbledhim<\/h2>\n<p><\/p>\n<p>Implementimi aktual i metroklastit n\u00eb sistemet e ruajtjes AERODISK Engine N-seri plot\u00ebsisht i mund\u00ebson zgjidhjen e detyrave, ku k\u00ebrkohet q\u00eb t\u00eb p\u00ebrjashtohet ose minimizohet koha e nd\u00ebrprerjes s\u00eb sh\u00ebrbimeve IT dhe t\u00eb sigurohet funksionimi i tyre n\u00eb modin 24\/7\/365 me shpenzime minime pune. <\/p>\n<p><\/p>\n<p>Mund t\u00eb thuhet, sigurisht, se e gjith\u00eb kjo \u00ebsht\u00eb teori, kushte ideale laboratorike dhe k\u00ebshtu me radh\u00eb... POR ne kemi nj\u00eb s\u00ebr\u00eb projektesh t\u00eb realizuara, n\u00eb t\u00eb cilat kemi realizuar funksionalitetin e q\u00ebndrueshm\u00ebris\u00eb ndaj fatkeq\u00ebsive, dhe sistemet funksionojn\u00eb shk\u00eblqyesh\u00ebm. Nj\u00eb nga klient\u00ebt tan\u00eb mjaft t\u00eb njohur, ku p\u00ebrdoren pik\u00ebrisht dy SHTD n\u00eb nj\u00eb konfigurim q\u00ebndrese ndaj fatkeq\u00ebsive, tashm\u00eb ka dh\u00ebn\u00eb miratimin p\u00ebr publikimin e informacionit n\u00eb lidhje me projektin, prandaj n\u00eb pjes\u00ebn tjet\u00ebr do t\u00eb flasim p\u00ebr implementimin n\u00eb terren.<\/p>\n<p><\/p>\n<p>Faleminderit, presim nj\u00eb diskutim produktiv.<\/p>\n<p>Burimi: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/aerodisk\/blog\/460305\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041f\u0440\u0438\u0432\u0435\u0442, \u0447\u0438\u0442\u0430\u0442\u0435\u043b\u0438 \u0425\u0430\u0431\u0440\u0430! \u0412 \u043f\u0440\u043e\u0448\u043b\u043e\u0439 \u0441\u0442\u0430\u0442\u044c\u0435 \u043c\u044b \u0440\u0430\u0441\u0441\u043a\u0430\u0437\u0430\u043b\u0438 \u043e \u043f\u0440\u043e\u0441\u0442\u043e\u043c \u0441\u0440\u0435\u0434\u0441\u0442\u0432\u0435 \u043a\u0430\u0442\u0430\u0441\u0442\u0440\u043e\u0444\u043e\u0443\u0441\u0442\u043e\u0439\u0447\u0438\u0432\u043e\u0441\u0442\u0438 \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0430\u0445 \u0445\u0440\u0430\u043d\u0435\u043d\u0438\u044f AERODISK ENGINE \u2013 \u043e \u0440\u0435\u043f\u043b\u0438\u043a\u0430\u0446\u0438\u0438. \u0412 \u044d\u0442\u043e\u0439 \u0441\u0442\u0430\u0442\u044c\u0435 \u043c\u044b \u043f\u043e\u0433\u0440\u0443\u0437\u0438\u043c\u0441\u044f \u0432 \u0431\u043e\u043b\u0435\u0435 \u0441\u043b\u043e\u0436\u043d\u0443\u044e \u0438 \u0438\u043d\u0442\u0435\u0440\u0435\u0441\u043d\u0443\u044e \u0442\u0435\u043c\u0443 \u2013 \u043c\u0435\u0442\u0440\u043e\u043a\u043b\u0430\u0441\u0442\u0435\u0440, \u0442\u043e \u0435\u0441\u0442\u044c \u0441\u0440\u0435\u0434\u0441\u0442\u0432\u043e \u0430\u0432\u0442\u043e\u043c\u0430\u0442\u0438\u0437\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u0439 \u0437\u0430\u0449\u0438\u0442\u044b \u043e\u0442 \u043a\u0430\u0442\u0430\u0441\u0442\u0440\u043e\u0444 \u0434\u043b\u044f \u0434\u0432\u0443\u0445 \u0426\u041e\u0414-\u043e\u0432, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0435\u0435 \u0440\u0430\u0431\u043e\u0442\u0430\u0442\u044c \u0426\u041e\u0414-\u0430\u043c \u0432 \u0440\u0435\u0436\u0438\u043c\u0435 active-active. \u0420\u0430\u0441\u0441\u043a\u0430\u0436\u0435\u043c, \u043f\u043e\u043a\u0430\u0436\u0435\u043c, \u0441\u043b\u043e\u043c\u0430\u0435\u043c \u0438 \u043f\u043e\u0447\u0438\u043d\u0438\u043c. \u041a\u0430\u043a [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":27126,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-36263","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.0.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041f\u0440\u0438\u0432\u0435\u0442, \u0447\u0438\u0442\u0430\u0442\u0435\u043b\u0438 \u0425\u0430\u0431\u0440\u0430! 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