{"id":30402,"date":"2019-10-31T21:35:21","date_gmt":"2019-10-31T18:35:21","guid":{"rendered":"https:\/\/prohoster.info\/blog\/flexiremap-protiv-raid\/"},"modified":"2019-10-31T21:35:21","modified_gmt":"2019-10-31T18:35:21","slug":"flexiremap-protiv-raid","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sq\/blog\/administrirovanie\/flexiremap-protiv-raid","title":{"rendered":"FlexiRemap\u00ae kund\u00ebr RAID","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Algoritmet RAID u prezantuan p\u00ebr publikun n\u00eb vitin 1987. Edhe sot, ato mbeten teknologjia m\u00eb e k\u00ebrkuar p\u00ebr mbrojtjen dhe p\u00ebrshpejtimin e qasjes n\u00eb t\u00eb dh\u00ebna n\u00eb fush\u00ebn e ruajtjes s\u00eb informacionit. Por mosha e teknologjis\u00eb IT, q\u00eb ka kaluar 30 vjet, \u00ebsht\u00eb m\u00eb shum\u00eb nj\u00eb plakje sesa pjekuri. Arsyeja \u00ebsht\u00eb p\u00ebrparimi, q\u00eb sjell vazhdimisht mund\u00ebsi t\u00eb reja. N\u00eb koh\u00ebt kur praktikisht nuk kishte asnj\u00eb ruajt\u00ebs tjet\u00ebr p\u00ebrve\u00e7 HDD-ve, algoritmet RAID lejuan p\u00ebrdorimin m\u00eb efikas t\u00eb burimeve t\u00eb ruajtjes s\u00eb disponueshme. Megjithat\u00eb, me shfaqjen e SSD-ve, situata ka ndryshuar rr\u00ebnj\u00ebsisht. Tani, RAID n\u00eb pun\u00ebn me ruajt\u00ebsit solid\u00eb \u00ebsht\u00eb b\u00ebr\u00eb nj\u00eb 'k\u00ebputje' p\u00ebr performanc\u00ebn e tyre. Prandaj, p\u00ebr t\u00eb zbuluar potencialin e plot\u00eb t\u00eb karakteristikave t\u00eb shpejt\u00ebsis\u00eb s\u00eb SSD-ve, nevojitet nj\u00eb qasje krejt\u00ebsisht e ndryshme p\u00ebr t\u00eb punuar me ta.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"FlexiRemap\u00ae kund\u00ebr RAID\" src=\"\/wp-content\/uploads\/2019\/03\/1633250deaffc822dbd043caa229ea2b.png\" style=\"display:block;margin: 0 auto;\" \/><noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<p>P\u00ebrve\u00e7 ndryshimeve t\u00eb dukshme mes HDD-ve dhe SSD-ve n\u00eb parimet e funksionimit, k\u00ebto dy lloje t\u00eb ruajt\u00ebsve kan\u00eb edhe nj\u00eb karakteristik\u00eb tjet\u00ebr t\u00eb r\u00ebnd\u00ebsishme: \u00e7do hard disk mund t\u00eb riparoj\u00eb t\u00eb dh\u00ebna t\u00eb ndryshme me granularitet prej nj\u00eb blloku (zakonisht 4KB tani). P\u00ebr SSD-t\u00eb, procesi i riparimit \u00ebsht\u00eb nj\u00eb procedur\u00eb shum\u00eb m\u00eb e komplikuar.<\/p>\n<p><\/p>\n<ul>\n<li>T\u00eb dh\u00ebnat e ndryshuara kopjohen n\u00eb nj\u00eb vend t\u00eb ri. N\u00eb k\u00ebt\u00eb rast, granulariteti \u00ebsht\u00eb po ai bllok, por q\u00eb p\u00ebrb\u00ebhet nga disa faqe dhe ka nj\u00eb madh\u00ebsi prej 256KB - 4MB. Pra, kur ndryshojn\u00eb ato 4KB, \u00ebsht\u00eb e nevojshme t\u00eb kopjohen gjithashtu t\u00eb gjitha fqejt e fqinj\u00ebve, q\u00eb formojn\u00eb nj\u00eb bllok t\u00eb vet\u00ebm.<\/li>\n<li>Blloqet 'e vjetra' sh\u00ebnohen si t\u00eb pap\u00ebrdorura, p\u00ebr t'u fshir\u00eb m\u00eb von\u00eb nga mbledh\u00ebsi i 'mbeturinave' (Garbage Collector).<\/li>\n<\/ul>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"FlexiRemap\u00ae kund\u00ebr RAID\" src=\"\/wp-content\/uploads\/2019\/03\/79f6a2a9657171387121b00c956f9034.png\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><i>Shkrimi\/riparimi i rregullt n\u00eb SSD<\/i><\/p>\n<p><\/p>\n<p>N\u00eb rastin e shkrimit\/riparimit t\u00eb rregullt, kjo karakteristik\u00eb e funksionimit t\u00eb SSD-ve nuk luan nj\u00eb rol t\u00eb madh n\u00eb performanc\u00ebn e tij, pasi blloqet jan\u00eb t\u00eb vendosura af\u00ebr, dhe mbledh\u00ebsi i 'mbeturinave' ka plot\u00ebsisht mund\u00ebsi t\u00eb p\u00ebrballoj\u00eb pun\u00ebn e tij n\u00eb sfond. Por n\u00eb jet\u00ebn reale, dhe sidomos n\u00eb segmentin Enterprise, p\u00ebr SSD-t\u00eb shpesh p\u00ebrdoret qasja e rast\u00ebsishme n\u00eb t\u00eb dh\u00ebna. Dhe k\u00ebto t\u00eb dh\u00ebna shkruhen n\u00eb vende t\u00eb rast\u00ebsishme n\u00eb ruajt\u00ebsit.<\/p>\n<p><\/p>\n<p>Sa m\u00eb shum\u00eb t\u00eb dh\u00ebna q\u00eb shkruhen n\u00eb SSD, aq m\u00eb e v\u00ebshtir\u00eb b\u00ebhet puna e mbledh\u00ebsit t\u00eb \"plehrave\", pasi fragmentimi rritet ndjesh\u00ebm. Si rezultat, arrin momenti kur procesi i pastrimit t\u00eb kujtes\u00ebs ndalon s\u00eb qeni \"n\u00eb background\": performanca e SSD bie ndjesh\u00ebm, pasi nj\u00eb pjes\u00eb e konsiderueshme e saj kapet nga Garbage Collector.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"FlexiRemap\u00ae kund\u00ebr RAID\" src=\"\/wp-content\/uploads\/2019\/03\/3374a6b98f220f7c4e4ff75a04565c26.png\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><i>Pozita reale e t\u00eb dh\u00ebnave n\u00eb SSD gjat\u00eb p\u00ebrdorimit t\u00eb p\u00ebrditsh\u00ebm<\/i><\/p>\n<p><\/p>\n<p>P\u00ebr t\u00eb ilustruar efektin e ndikimit t\u00eb pun\u00ebs s\u00eb mbledh\u00ebsit t\u00eb \"plehrave\" n\u00eb var\u00ebsi t\u00eb modit t\u00eb shkrimit n\u00eb kujtes\u00eb, mund t\u00eb kryhen teste shum\u00eb t\u00eb thjeshta: shkrim i rregullt dhe i rast\u00ebsish\u00ebm me blloqe 4KB n\u00eb nj\u00eb kujtes\u00eb me kapacitet 100GB. (Burimi \u2013 kompania <noindex><a rel=\"nofollow\" href=\"http:\/\/www.micron.com\/~\/media\/documents\/products\/technical-marketing-brief\/brief_ssd_effect_data_placement_writes.pdf\">Micron<\/a><\/noindex>)<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"FlexiRemap\u00ae kund\u00ebr RAID\" src=\"\/wp-content\/uploads\/2019\/03\/7e3b1f25dd27463d2c7b08ae84ff44b4.png\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><i>Performanca gjat\u00eb shkrimit t\u00eb rregullt<\/i><\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"FlexiRemap\u00ae kund\u00ebr RAID\" src=\"\/wp-content\/uploads\/2019\/03\/9c7d7be5982d6df688cf9481a0e9a826.png\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><i>Performanca gjat\u00eb shkrimit t\u00eb rast\u00ebsish\u00ebm<\/i><\/p>\n<p><\/p>\n<p>Si\u00e7 duket nga testet, r\u00ebnia e performanc\u00ebs mund t\u00eb arrij\u00eb mbi dyfish. Dhe kjo \u00ebsht\u00eb vet\u00ebm nj\u00eb kujtes\u00eb e vetme. N\u00eb rastin e p\u00ebrdorimit t\u00eb SSD-ve si pjes\u00eb e nj\u00eb grupi RAID, numri i operacioneve t\u00eb shkrimit rritet ndjesh\u00ebm, fal\u00ebpun\u00ebs p\u00ebr me paritet.<\/p>\n<p><\/p>\n<p>N\u00eb p\u00ebrgjith\u00ebsi, p\u00ebr shkak t\u00eb k\u00ebtyre ve\u00e7orive t\u00eb pun\u00ebs s\u00eb SSD-ve, p\u00ebr to ekziston nj\u00eb paramet\u00ebr i till\u00eb si koeficienti i shkrimit (write amplification). Kjo \u00ebsht\u00eb raporti i sasis\u00eb s\u00eb t\u00eb dh\u00ebnave q\u00eb jan\u00eb shkruar n\u00eb kujtes\u00eb, ndaj sasis\u00eb s\u00eb t\u00eb dh\u00ebnave q\u00eb n\u00eb t\u00eb v\u00ebrtet\u00eb d\u00ebrgoi hosti. Dhe p\u00ebr RAID5 m\u00eb popullor, ky koeficient \u00ebsht\u00eb ~3.5. <\/p>\n<p><\/p>\n<p>Si rezultat, sistemet me RAID klasik n\u00eb esenc\u00ebn e tyre shfryt\u00ebzojn\u00eb SSD-t\u00eb vet\u00ebm ~10% t\u00eb shpejt\u00ebsis\u00eb s\u00eb tyre reale dhe kan\u00eb nj\u00eb shkall\u00eb t\u00eb dob\u00ebt t\u00eb shkall\u00ebzimit n\u00eb performanc\u00eb kur rritet numri i kujtesave p\u00ebrtej dhjet\u00eb.<\/p>\n<p><\/p>\n<p>Gjithashtu, duhet theksuar se operacionet e tepruara t\u00eb shkrimit jo vet\u00ebm q\u00eb reduktojn\u00eb performanc\u00ebn e SSD-ve, por gjithashtu zvog\u00eblojn\u00eb burimin e tij q\u00eb nuk \u00ebsht\u00eb aspak i pafund, duke shkurtuar k\u00ebshtu jet\u00ebgjat\u00ebsin\u00eb e kujtes\u00ebs.<\/p>\n<p><\/p>\n<p><noindex><a rel=\"nofollow\" href=\"http:\/\/accelstor.ru\/page\/flexiremap-technology\">Teknologjia FlexiRemap\u00ae<\/a><\/noindex>, q\u00eb \u00ebsht\u00eb thelbi i t\u00eb gjitha produkteve AccelStor, \u00ebsht\u00eb zhvilluar si nj\u00eb alternativ\u00eb ndaj algoritmeve klasike t\u00eb RAID gjat\u00eb pun\u00ebs me SSD. Inovativiteti i teknologjis\u00eb \u00ebsht\u00eb vler\u00ebsuar nga patenta t\u00eb ndryshme dhe \u00e7mime (p\u00ebrfshir\u00eb n\u00eb Flash Memory Summit 2016), si dhe nga rezultatet e testeve t\u00eb pavarura (p.sh., SPC1).<\/p>\n<p><\/p>\n<p>Q\u00ebllimi <noindex><a rel=\"nofollow\" href=\"http:\/\/accelstor.ru\/page\/flexiremap-advantages\">FlexiRemap\u00ae<\/a><\/noindex> \u0441\u043e\u0441\u0442\u043e\u0438\u0442 \u0432 \u043f\u0440\u0435\u043e\u0431\u0440\u0430\u0437\u043e\u0432\u0430\u043d\u0438\u0438 \u0432\u0441\u0435\u0445 \u043f\u043e\u0441\u0442\u0443\u043f\u0430\u044e\u0449\u0438\u0445 \u0437\u0430\u043f\u0440\u043e\u0441\u043e\u0432 \u043d\u0430 \u0437\u0430\u043f\u0438\u0441\u044c, \u0438 \u0433\u043b\u0430\u0432\u043d\u044b\u043c \u043e\u0431\u0440\u0430\u0437\u043e\u043c \u0442\u0438\u043f\u0430 random, \u0432 \u043d\u0430\u0431\u043e\u0440 \u0431\u043b\u043e\u043a\u043e\u0432, \u043c\u0430\u043a\u0441\u0438\u043c\u0430\u043b\u044c\u043d\u043e \u043f\u043e\u0445\u043e\u0436\u0435\u0433\u043e \u043d\u0430 \u0440\u0435\u0436\u0438\u043c \u043f\u043e\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044c\u043d\u043e\u0439 \u0437\u0430\u043f\u0438\u0441\u0438 \u0441 \u0442\u043e\u0447\u043a\u0438 \u0437\u0440\u0435\u043d\u0438\u044f \u043d\u0430\u043a\u043e\u043f\u0438\u0442\u0435\u043b\u044f. \u0412 \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442\u0435 \u0437\u0430\u043f\u0438\u0441\u044c \u043d\u0430 SSD \u043f\u0440\u043e\u0438\u0441\u0445\u043e\u0434\u0438\u0442 \u0432 \u043c\u0430\u043a\u0441\u0438\u043c\u0430\u043b\u044c\u043d\u043e \u043a\u043e\u043c\u0444\u043e\u0440\u0442\u043d\u043e\u043c \u0434\u043b\u044f \u043d\u0438\u0445 \u0440\u0435\u0436\u0438\u043c\u0435, \u0430 \u0438\u0442\u043e\u0433\u043e\u0432\u0430\u044f \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c \u043f\u0440\u0435\u0432\u044b\u0448\u0430\u0435\u0442 \u043b\u044e\u0431\u044b\u0435 \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u0441 \u043a\u043b\u0430\u0441\u0441\u0438\u0447\u0435\u0441\u043a\u0438\u043c RAID.<\/p>\n<p><\/p>\n<p>\u0412\u0441\u0435 SSD \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0430\u0445 AccelStor \u0434\u0435\u043b\u044f\u0442\u0441\u044f \u043d\u0430 \u0434\u0432\u0435 \u0441\u0438\u043c\u043c\u0435\u0442\u0440\u0438\u0447\u043d\u044b\u0435 \u0433\u0440\u0443\u043f\u043f\u044b FlexiRemap\u00ae. \u0420\u0430\u0437\u043c\u0435\u0440 \u0433\u0440\u0443\u043f\u043f\u044b \u0437\u0430\u0432\u0438\u0441\u0438\u0442 \u043e\u0442 \u043c\u043e\u0434\u0435\u043b\u0438 \u0438 \u0441\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u0442 5-11 \u043d\u0430\u043a\u043e\u043f\u0438\u0442\u0435\u043b\u0435\u0439. \u0414\u043b\u044f \u043e\u0442\u043a\u0430\u0437\u043e\u0443\u0441\u0442\u043e\u0439\u0447\u0438\u0432\u043e\u0441\u0442\u0438 \u0432\u043d\u0443\u0442\u0440\u0438 \u0433\u0440\u0443\u043f\u043f\u044b \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u0442\u0441\u044f parity \u043f\u043e\u0434\u043e\u0431\u043d\u043e RAID5. \u041e\u0431\u0435 \u0433\u0440\u0443\u043f\u043f\u044b \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044e\u0442\u0441\u044f \u0441\u043e\u0432\u043c\u0435\u0441\u0442\u043d\u043e, \u043e\u0431\u0440\u0430\u0437\u0443\u044f \u043e\u0431\u0449\u0435\u0435 \u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u0441\u0442\u0432\u043e \u0445\u0440\u0430\u043d\u0435\u043d\u0438\u044f. \u041f\u043e\u044d\u0442\u043e\u043c\u0443 \u0438\u0442\u043e\u0433\u043e\u0432\u0430\u044f \u043e\u0442\u043a\u0430\u0437\u043e\u0443\u0441\u0442\u043e\u0439\u0447\u0438\u0432\u043e\u0441\u0442\u044c \u0431\u0443\u0434\u0435\u0442 \u0430\u043d\u0430\u043b\u043e\u0433\u0438\u0447\u043d\u0430 \u043c\u0430\u0441\u0441\u0438\u0432\u0443 RAID50, \u0441\u043e\u0441\u0442\u043e\u044f\u0449\u0435\u0433\u043e \u0438\u0437 \u0434\u0432\u0443\u0445 \u0433\u0440\u0443\u043f\u043f: \u0441\u0438\u0441\u0442\u0435\u043c\u0430 \u0441\u043f\u043e\u0441\u043e\u0431\u043d\u0430 \u0432\u044b\u0434\u0435\u0440\u0436\u0430\u0442\u044c \u043e\u0442\u043a\u0430\u0437 \u0434\u043e \u0434\u0432\u0443\u0445 SSD, \u043d\u043e \u043d\u0435 \u0431\u043e\u043b\u0435\u0435 \u043e\u0434\u043d\u043e\u0433\u043e \u0432 \u043a\u0430\u0436\u0434\u043e\u0439 \u0433\u0440\u0443\u043f\u043f\u0435 FlexiRemap\u00ae.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"FlexiRemap\u00ae kund\u00ebr RAID\" src=\"\/wp-content\/uploads\/2019\/03\/76adaa3e4a9dbd1394ba18dac79e21e5.png\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>\u0412\u0441\u0435 \u043f\u043e\u0441\u0442\u0443\u043f\u0430\u044e\u0449\u0438\u0435 \u0437\u0430\u043f\u0440\u043e\u0441\u044b \u043d\u0430 \u0437\u0430\u043f\u0438\u0441\u044c \u0434\u0440\u043e\u0431\u044f\u0442\u0441\u044f \u043d\u0430 \u0431\u043b\u043e\u043a\u0438 \u0440\u0430\u0437\u043c\u0435\u0440\u043e\u043c 4\u041a\u0411, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u0432 \u0440\u0435\u0436\u0438\u043c\u0435 round robin \u0437\u0430\u043f\u0438\u0441\u044b\u0432\u0430\u044e\u0442\u0441\u044f \u043d\u0430 \u043e\u0431\u0435 \u0433\u0440\u0443\u043f\u043f\u044b FlexiRemap\u00ae. \u041f\u0440\u0438 \u044d\u0442\u043e\u043c \u0441\u0438\u0441\u0442\u0435\u043c\u0430 \u043f\u043e\u0441\u0442\u043e\u044f\u043d\u043d\u043e \u0432\u0435\u0434\u0435\u0442 \u0443\u0447\u0435\u0442 \u0432\u043e\u0441\u0442\u0440\u0435\u0431\u043e\u0432\u0430\u043d\u043d\u043e\u0441\u0442\u0438 \u0437\u0430\u043f\u0438\u0441\u0430\u043d\u043d\u044b\u0445 \u0431\u043b\u043e\u043a\u043e\u0432, \u0441\u0442\u0430\u0440\u0430\u044f\u0441\u044c \u043f\u0440\u0438 \u0438\u0445 \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u0438 \u0437\u0430\u043f\u0438\u0441\u044b\u0432\u0430\u0442\u044c \u043f\u043e\u0434\u043e\u0431\u043d\u044b\u0435 \u0431\u043b\u043e\u043a\u0438 \u043c\u0430\u043a\u0441\u0438\u043c\u0430\u043b\u044c\u043d\u043e \u0431\u043b\u0438\u0437\u043a\u043e \u0434\u0440\u0443\u0433 \u043a \u0434\u0440\u0443\u0433\u0443. \u041f\u043e\u043b\u0443\u0447\u0430\u0435\u0442\u0441\u044f \u0432\u0438\u0440\u0442\u0443\u0430\u043b\u044c\u043d\u044b\u0439 \u0430\u043d\u0430\u043b\u043e\u0433 \u0442\u0438\u0440\u0438\u043d\u0433\u0430, \u0435\u0441\u043b\u0438 \u0432\u044b\u0440\u0430\u0436\u0430\u0442\u044c\u0441\u044f \u0432 \u0442\u0435\u0440\u043c\u0438\u043d\u0430\u0445 \u0421\u0425\u0414. \u0412 \u044d\u0442\u043e\u043c \u0441\u043b\u0443\u0447\u0430\u0435 \u0437\u043d\u0430\u0447\u0438\u0442\u0435\u043b\u044c\u043d\u043e \u043e\u0431\u043b\u0435\u0433\u0447\u0430\u0435\u0442\u0441\u044f \u0440\u0430\u0431\u043e\u0442\u0430 \u0441\u0431\u043e\u0440\u0449\u0438\u043a\u0430 \u00ab\u043c\u0443\u0441\u043e\u0440\u0430\u00bb: \u0432\u0435\u0434\u044c \u043d\u0435\u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u043c\u044b\u0435 \u0431\u043b\u043e\u043a\u0438 \u043f\u043e\u0441\u0442\u043e\u044f\u043d\u043d\u043e \u0431\u0443\u0434\u0443\u0442 \u043d\u0430\u0445\u043e\u0434\u0438\u0442\u044c\u0441\u044f \u0440\u044f\u0434\u043e\u043c.<\/p>\n<p><\/p>\n<p>Duhet t\u00eb theksohet se <noindex><a rel=\"nofollow\" href=\"http:\/\/accelstor.ru\/page\/modeli-vysokoj-dostupnosti-ha\">\u0441\u0438\u0441\u0442\u0435\u043c\u044b AccelStor<\/a><\/noindex> \u0432 \u043e\u0442\u043b\u0438\u0447\u0438\u0435 \u043e\u0442 \u043f\u0440\u043e\u0434\u0443\u043a\u0446\u0438\u0438 \u043a\u043e\u043d\u043a\u0443\u0440\u0435\u043d\u0442\u043e\u0432 \u043d\u0435 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044e\u0442 \u0444\u0443\u043d\u043a\u0446\u0438\u043e\u043d\u0430\u043b \u043a\u044d\u0448\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u0432\u0445\u043e\u0434\u044f\u0449\u0438\u0445 \u0437\u0430\u043f\u0440\u043e\u0441\u043e\u0432 \u0432 \u043e\u043f\u0435\u0440\u0430\u0442\u0438\u0432\u043d\u043e\u0439 \u043f\u0430\u043c\u044f\u0442\u0438 \u043a\u043e\u043d\u0442\u0440\u043e\u043b\u043b\u0435\u0440\u0430. \u0412\u0441\u0435 \u043f\u043e\u0441\u0442\u0443\u043f\u0430\u044e\u0449\u0438\u0435 \u0431\u043b\u043e\u043a\u0438 \u0434\u0430\u043d\u043d\u044b\u0445 \u043d\u0435\u043c\u0435\u0434\u043b\u0435\u043d\u043d\u043e \u0437\u0430\u043f\u0438\u0441\u044b\u0432\u0430\u044e\u0442\u0441\u044f \u043d\u0430 SSD. \u0425\u043e\u0441\u0442 \u043f\u043e\u043b\u0443\u0447\u0430\u0435\u0442 \u043f\u043e\u0434\u0442\u0432\u0435\u0440\u0436\u0434\u0435\u043d\u0438\u0435 \u043e\u0431 \u0443\u0441\u043f\u0435\u0448\u043d\u043e\u0439 \u0437\u0430\u043f\u0438\u0441\u0438 \u0442\u043e\u043b\u044c\u043a\u043e \u043f\u043e\u0441\u043b\u0435 \u0444\u0438\u0437\u0438\u0447\u0435\u0441\u043a\u043e\u0433\u043e \u0440\u0430\u0437\u043c\u0435\u0449\u0435\u043d\u0438\u044f \u0434\u0430\u043d\u043d\u044b\u0445 \u043d\u0430 \u043d\u0430\u043a\u043e\u043f\u0438\u0442\u0435\u043b\u044f\u0445. \u0412 RAM \u0445\u0440\u0430\u043d\u044f\u0442\u0441\u044f \u043b\u0438\u0448\u044c \u0442\u0430\u0431\u043b\u0438\u0446\u044b \u0440\u0430\u0437\u043c\u0435\u0449\u0435\u043d\u0438\u044f \u0431\u043b\u043e\u043a\u043e\u0432 \u043d\u0430 SSD \u0434\u043b\u044f \u0443\u0441\u043a\u043e\u0440\u0435\u043d\u0438\u044f \u0434\u043e\u0441\u0442\u0443\u043f\u0430 \u0438 \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0435\u043d\u0438\u044f, \u043a\u0443\u0434\u0430 \u0437\u0430\u043f\u0438\u0441\u0430\u0442\u044c \u043e\u0447\u0435\u0440\u0435\u0434\u043d\u043e\u0439 \u0431\u043b\u043e\u043a \u0434\u0430\u043d\u043d\u044b\u0445. \u0420\u0430\u0437\u0443\u043c\u0435\u0435\u0442\u0441\u044f, \u0434\u043b\u044f \u043d\u0430\u0434\u0435\u0436\u043d\u043e\u0441\u0442\u0438 \u043a\u043e\u043f\u0438\u0438 \u044d\u0442\u0438\u0445 \u0442\u0430\u0431\u043b\u0438\u0446 \u0440\u0430\u0441\u043f\u043e\u043b\u043e\u0436\u0435\u043d\u044b \u0438 \u043d\u0430 \u0441\u0430\u043c\u0438\u0445 \u043d\u043e\u0441\u0438\u0442\u0435\u043b\u044f\u0445. \u0412 \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442\u0435 \u0441\u0438\u0441\u0442\u0435\u043c\u0430\u043c AccelStor \u043d\u0435 \u0442\u0440\u0435\u0431\u0443\u0435\u0442\u0441\u044f \u043d\u0438\u043a\u0430\u043a\u0430\u044f \u0437\u0430\u0449\u0438\u0442\u0430 \u043a\u044d\u0448\u0430 \u0432 \u0432\u0438\u0434\u0435 \u0431\u0430\u0442\u0430\u0440\u0435\u0438\/\u043a\u043e\u043d\u0434\u0435\u043d\u0441\u0430\u0442\u043e\u0440\u0430 (\u0432\u043f\u0440\u043e\u0447\u0435\u043c, \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u0438\u0442\u044c \u0441\u0432\u044f\u0437\u044c \u0441 \u0418\u0411\u041f \u0438\u043c\u0435\u0435\u0442\u0441\u044f \u2013 \u0434\u043b\u044f \u00ab\u043c\u044f\u0433\u043a\u043e\u0433\u043e\u00bb \u0432\u044b\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u044f \u0432 \u0441\u043b\u0443\u0447\u0430\u0435 \u043f\u0440\u043e\u0431\u043b\u0435\u043c \u0441 \u044d\u043b\u0435\u043a\u0442\u0440\u043e\u043f\u0438\u0442\u0430\u043d\u0438\u0435\u043c).<\/p>\n<p><\/p>\n<p>Fal\u00eb k\u00ebtij qasje n\u00eb organizimin e shkrimit, mbledh\u00ebsi i \"mbetjeve\" \u00ebsht\u00eb n\u00eb gjendje t\u00eb punoj\u00eb n\u00eb sfond, pa ndikuar ndjesh\u00ebm n\u00eb shpejt\u00ebsin\u00eb e magazinave, \u00e7ka lejon q\u00eb n\u00eb sistem t\u00eb p\u00ebrpunohen deri n\u00eb 90% e performanc\u00ebs s\u00eb SSD. Kjo \u00ebsht\u00eb arsyeja pse treguesit e lart\u00eb IOPS n\u00eb sistemet AccelStor jan\u00eb t\u00eb pranish\u00ebm, krahas All Flash, q\u00eb bazohen n\u00eb algoritme RAID.<\/p>\n<p><\/p>\n<p>Nj\u00eb ve\u00e7ori tjet\u00ebr e r\u00ebnd\u00ebsishme e teknologjis\u00eb FlexiRemap\u00ae \u00ebsht\u00eb reduktimi i duksh\u00ebm i operacioneve t\u00eb tep\u00ebrta t\u00eb shkrimit n\u00eb SSD. K\u00ebshtu, koeficienti i shkrimit (write amplification) p\u00ebr sistemet AccelStor \u00ebsht\u00eb vet\u00ebm 1.3, e cila n\u00eb terma t\u00eb zakonsh\u00ebm do t\u00eb thot\u00eb se jeta e magazinave rritet m\u00eb shum\u00eb se 2.5 her\u00eb krahasuar me RAID5! <\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"FlexiRemap\u00ae kund\u00ebr RAID\" src=\"\/wp-content\/uploads\/2019\/03\/c503ed537aed33aa0e1e98595ed020a2.png\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>Fal\u00eb kontrollit t\u00eb vazhduesh\u00ebm nga sistemi mbi politik\u00ebn e vendosjes s\u00eb t\u00eb dh\u00ebnave n\u00eb SSD, t\u00eb gjitha magazinat konsumohen nj\u00ebsoj. Ky qasje lejon parashikimin e jet\u00ebs s\u00eb tyre dhe d\u00ebrgimin e nj\u00eb sinjali administartorit kur burimi i shkrimit \u00ebsht\u00eb n\u00eb p\u00ebrfundim.<\/p>\n<p><\/p>\n<p>Sht\u00eb e qart\u00eb se SSD-t\u00eb mund t\u00eb d\u00ebshtojn\u00eb. N\u00eb k\u00ebt\u00eb rast, sistemi menj\u00ebher\u00eb do t\u00eb filloj\u00eb rind\u00ebrtimin n\u00eb nj\u00eb nga disk\u00ebt rezerv\u00eb. Gjat\u00eb k\u00ebsaj kohe, grupi FlexiRemap\u00ae, n\u00eb gjendje t\u00eb degraduar, kalon n\u00eb modin \"vet\u00ebm p\u00ebr lexim\", nd\u00ebrsa t\u00eb gjitha k\u00ebrkesat p\u00ebr shkrim d\u00ebrgohen n\u00eb grupin e dyt\u00eb. Ky mekaniz\u00ebm mbrojt\u00ebs \u00ebsht\u00eb parashikuar p\u00ebr t\u00eb p\u00ebrshpejtuar operacionin e rind\u00ebrtimit dhe p\u00ebr t\u00eb reduktuar probabilitetin e d\u00ebshtimit t\u00eb nj\u00eb diskut tjet\u00ebr n\u00eb t\u00eb nj\u00ebjtin grup. Nj\u00eb e v\u00ebrtet\u00eb \u00ebsht\u00eb se gjat\u00eb rind\u00ebrtimit, t\u00eb gjitha magazinat n\u00eb grup p\u00ebrjetojn\u00eb nj\u00eb ngarkes\u00eb t\u00eb rritur p\u00ebr shkak t\u00eb nd\u00ebrhyrjeve t\u00eb operacioneve t\u00eb leximit, shkrimit dhe rikuperimit n\u00eb hot spare. K\u00ebshtu, rritet probabiliteti p\u00ebr d\u00ebshtimin e disku tjet\u00ebr. Sa m\u00eb shum\u00eb operacione shkrimi, aq m\u00eb gjat\u00eb do t\u00eb zgjas\u00eb rind\u00ebrtimi. <\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"FlexiRemap\u00ae kund\u00ebr RAID\" src=\"\/wp-content\/uploads\/2019\/03\/c6389348c25427854ae24a17da9b89a7.png\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>Pas p\u00ebrfundimit t\u00eb procesit t\u00eb rikuperimit dhe kthimit t\u00eb grupit FlexiRemap\u00ae n\u00eb gjendjen normale, do t\u00eb ket\u00eb nj\u00eb pakic\u00eb n\u00eb burimin e shkrimit midis dy grupeve. Prandaj, p\u00ebr t\u00eb balancuar k\u00ebt\u00eb, operacionet e ardhshme t\u00eb shkrimit do t\u00eb ndodhin m\u00eb shpesh n\u00eb grupin e rikuperuar (sigurisht, me nj\u00eb llogari q\u00eb performanca p\u00ebrfundimtare e sistemit t\u00eb mos vuaj\u00eb shum\u00eb).<\/p>\n<p><\/p>\n<blockquote><p>P\u00ebrmir\u00ebsimi i performanc\u00ebs s\u00eb sistemeve All Flash, t\u00eb cilat mb\u00ebshteten n\u00eb algoritmet RAID, \u00ebsht\u00eb i pamundur t\u00eb tejkaloj\u00eb disa vlerat (~280K IOPS@4K shkrim t\u00eb rast\u00ebsish\u00ebm), edhe me p\u00ebrdorimin e sistemeve komplekse t\u00eb \u043a\u0435\u0448\u0438\u0440\u0438\u043c. Teknologjia FlexiRemap\u00ae, p\u00ebr shkak t\u00eb nj\u00eb qasjeje krejt\u00ebsisht t\u00eb ndryshme ndaj organizimit t\u00eb hap\u00ebsir\u00ebs s\u00eb ruajtjes, jo vet\u00ebm q\u00eb e kalon leht\u00ebsisht k\u00ebt\u00eb barrier\u00eb, por gjithashtu rrit me disa her\u00eb jet\u00ebgjat\u00ebsin\u00eb e SSD-ve. Prandaj, sistemet <noindex><a rel=\"nofollow\" href=\"http:\/\/accelstor.ru\">AccelStor<\/a><\/noindex> kan\u00eb p\u00ebrpar\u00ebsi t\u00eb dukshme mes grupeve All Flash n\u00eb shum\u00eb aspekte (IOPS\/ $, GB\/ $, TCO, ROI), duke i b\u00ebr\u00eb ato kandidat\u00eb ideal\u00eb p\u00ebr pozita ky\u00e7e n\u00eb qendrat e t\u00eb dh\u00ebnave t\u00eb klient\u00ebve p\u00ebr zgjidhjen e detyrave q\u00eb k\u00ebrkojn\u00eb shum\u00eb burime.<\/p><\/blockquote>\n<p>Burimi: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/accelstor\/blog\/445336\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0410\u043b\u0433\u043e\u0440\u0438\u0442\u043c\u044b RAID \u0431\u044b\u043b\u0438 \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u044b \u043e\u0431\u0449\u0435\u0441\u0442\u0432\u0435\u043d\u043d\u043e\u0441\u0442\u0438 \u0432 \u0434\u0430\u043b\u0435\u043a\u043e\u043c 1987 \u0433\u043e\u0434\u0443. \u041f\u043e \u0441\u0435\u0439 \u0434\u0435\u043d\u044c \u043e\u043d\u0438 \u043e\u0441\u0442\u0430\u044e\u0442\u0441\u044f \u043d\u0430\u0438\u0431\u043e\u043b\u0435\u0435 \u0432\u043e\u0441\u0442\u0440\u0435\u0431\u043e\u0432\u0430\u043d\u043d\u043e\u0439 \u0442\u0435\u0445\u043d\u043e\u043b\u043e\u0433\u0438\u0435\u0439 \u0437\u0430\u0449\u0438\u0442\u044b \u0438 \u0443\u0441\u043a\u043e\u0440\u0435\u043d\u0438\u044f \u0434\u043e\u0441\u0442\u0443\u043f\u0430 \u043a \u0434\u0430\u043d\u043d\u044b\u043c \u0432 \u0441\u0444\u0435\u0440\u0435 \u0445\u0440\u0430\u043d\u0435\u043d\u0438\u044f \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u0438. \u041d\u043e \u0432\u043e\u0437\u0440\u0430\u0441\u0442 IT \u0442\u0435\u0445\u043d\u043e\u043b\u043e\u0433\u0438\u0438, \u043f\u0435\u0440\u0435\u0448\u0430\u0433\u043d\u0443\u0432\u0448\u0435\u0439 30-\u0442\u0438 \u043b\u0435\u0442\u043d\u0438\u0439 \u0440\u0443\u0431\u0435\u0436, \u2013 \u044d\u0442\u043e \u0441\u043a\u043e\u0440\u0435\u0435 \u043d\u0435 \u0437\u0440\u0435\u043b\u043e\u0441\u0442\u044c, \u0430 \u0443\u0436\u0435 \u0441\u0442\u0430\u0440\u043e\u0441\u0442\u044c. \u041f\u0440\u0438\u0447\u0438\u043d\u043e\u0439 \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u043f\u0440\u043e\u0433\u0440\u0435\u0441\u0441, \u043d\u0435\u0443\u043c\u043e\u043b\u0438\u043c\u043e \u043d\u0435\u0441\u0443\u0449\u0438\u0439 \u0432 \u0441\u0435\u0431\u0435 \u043d\u043e\u0432\u044b\u0435 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u0438. \u0412\u043e \u0432\u0440\u0435\u043c\u0435\u043d\u0430, \u043a\u043e\u0433\u0434\u0430 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