{"id":75577,"date":"2020-03-27T07:42:08","date_gmt":"2020-03-27T05:42:08","guid":{"rendered":"https:\/\/prohoster.info\/blog\/administrirovanie\/fast-vp-v-shd-unity-kak-eto-rabotaet"},"modified":"2020-03-27T07:42:08","modified_gmt":"2020-03-27T05:42:08","slug":"fast-vp-v-shd-unity-kak-eto-rabotaet","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/administrirovanie\/fast-vp-v-shd-unity-kak-eto-rabotaet","title":{"rendered":"FAST VP v \u00falo\u017ei\u0161ti Unity: jak to funguje","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Dnes se budeme bavit o zaj\u00edmav\u00e9 technologii implementovan\u00e9 v \u00falo\u017ei\u0161ti Unity\/Unity XT \u2013 FAST VP. Pokud o Unity sly\u0161\u00edte poprv\u00e9, m\u016f\u017eete si na odkazu na konci \u010dl\u00e1nku p\u0159e\u010d\u00edst specifikace syst\u00e9mu. V projektov\u00e9m t\u00fdmu Dell EMC jsem pracoval na FAST VP v\u00edce ne\u017e rok. Dnes v\u00e1m chci podrobn\u011bji p\u0159edstavit tuto technologii a odhalit n\u011bkter\u00e9 detaily jej\u00ed realizace. Samoz\u0159ejm\u011b jen ty, kter\u00e9 mohu sd\u00edlet. Pokud v\u00e1s zaj\u00edmaj\u00ed ot\u00e1zky efektivn\u00edho ukl\u00e1d\u00e1n\u00ed dat, nebo pokud jste si je\u0161t\u011b \u00fapln\u011b nepro\u010detli dokumentaci, tato \u010dl\u00e1nek bude jist\u011b u\u017eite\u010dn\u00fd a zaj\u00edmav\u00fd. <\/p>\n<p><img decoding=\"async\" alt=\"FAST VP v \u00falo\u017ei\u0161ti Unity: jak to funguje\" src=\"\/wp-content\/uploads\/2020\/03\/1f026bfb90e0b050da5222cebf537be7.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\nHned na \u00favod \u0159eknu, co v materi\u00e1lu nebude. Nebude zde anal\u00fdza konkurence a srovn\u00e1n\u00ed s nimi. Tak\u00e9 nepl\u00e1nuji hovo\u0159it o podobn\u00fdch technologi\u00edch z open source, proto\u017ee zv\u011bdav\u00fd \u010dten\u00e1\u0159 u\u017e o nich v\u00ed. A samoz\u0159ejm\u011b nechci nic propagovat.<\/p>\n<h2>\u00dalo\u017en\u00e9 tiering. C\u00edle a \u00fakoly FAST VP<\/h2>\n<p>\nFAST VP je zkratka pro Fully Automated Storage Tiering for Virtual Pool. Zn\u00ed to slo\u017eit\u011b? Nic, te\u010f si to objasn\u00edme. Tiering je zp\u016fsob organizace ukl\u00e1d\u00e1n\u00ed dat, p\u0159i kter\u00e9m existuje n\u011bkolik \u00farovn\u00ed (tiers), kde jsou tato data ulo\u017eena. Ka\u017ed\u00e1 \u00farove\u0148 m\u00e1 sv\u00e9 vlastnosti. Nejzn\u00e1m\u011bj\u0161\u00ed jsou: v\u00fdkon, objem a cena za ulo\u017een\u00ed jednotky informace. Samoz\u0159ejm\u011b mezi nimi existuje vztah.<\/p>\n<p>D\u016fle\u017eitou vlastnost\u00ed tieringu je, \u017ee p\u0159\u00edstup k dat\u016fm je poskytov\u00e1n jednotn\u011b, bez ohledu na to, na kter\u00e9 \u00farovni \u00falo\u017ei\u0161t\u011b se v danou chv\u00edli nach\u00e1z\u00ed, a velikost poolu se rovn\u00e1 sou\u010dtu velikost\u00ed zdroj\u016f, kter\u00e9 do n\u011bj pat\u0159\u00ed. Zde jsou rozd\u00edly od cache: velikost cache se nep\u0159i\u010d\u00edt\u00e1 k celkov\u00e9mu objemu zdroje (v tomto p\u0159\u00edpad\u011b poolu), zat\u00edmco data v cache duplikuj\u00ed n\u011bjak\u00fd fragment dat z prim\u00e1rn\u00edho m\u00e9dia (nebo jej budou duplikovat, pokud data z cache je\u0161t\u011b nebyla zaps\u00e1na). Rozd\u011blen\u00ed dat podle \u00farovn\u00ed je u\u017eivateli skryto. To znamen\u00e1, \u017ee nevid\u00ed, jak\u00e1 konkr\u00e9tn\u00ed data jsou na ka\u017ed\u00e9 \u00farovni, a\u010dkoliv m\u016f\u017ee na to nep\u0159\u00edmo p\u016fsobit prost\u0159ednictv\u00edm nastaven\u00ed politik (o t\u011bch pozd\u011bji).<\/p>\n<p>Nyn\u00ed se pod\u00edvejme na zvl\u00e1\u0161tnosti implementace storage tieringu v Unity. V Unity se vy\u010dle\u0148uj\u00ed 3 \u00farovn\u011b neboli tiers:<\/p>\n<ul>\n<li>Extr\u00e9mn\u00ed v\u00fdkon (SSD)<\/li>\n<li>V\u00fdkon (SAS HDD 10k\/15k RPM)<\/li>\n<li>Kapacita (NL-SAS HDD 7200 RPM)<\/li>\n<\/ul>\n<p>\nJsou se\u0159azeny podle klesaj\u00edc\u00edho v\u00fdkonu a ceny. V Extreme performance jsou zahrnuty v\u00fdhradn\u011b pevn\u00e9 disky (SSD). V dal\u0161\u00edch dvou \u00farovn\u00edch jsou to magnetick\u00e9 disky, kter\u00e9 se li\u0161\u00ed rychlost\u00ed ot\u00e1\u010den\u00ed a tedy i v\u00fdkonem.<\/p>\n<p>\u00dalo\u017en\u00e9 prost\u0159edky stejn\u00e9 \u00farovn\u011b a velikosti se spojuj\u00ed do RAID pole, \u010d\u00edm\u017e vznik\u00e1 RAID skupina (RAID group, zkr\u00e1cen\u011b \u2013 RG); o dostupn\u00fdch a doporu\u010den\u00fdch \u00farovn\u00edch RAID se m\u016f\u017eete do\u010d\u00edst v ofici\u00e1ln\u00ed dokumentaci. Z RAID skupin jedn\u00e9 nebo v\u00edce \u00farovn\u00ed se tvo\u0159\u00ed \u00falo\u017ei\u0161t\u011b dat (Storage pool), ze kter\u00e9ho se potom distribuuje voln\u00e9 m\u00edsto. A u\u017e z poolu je vy\u010dlen\u011bno m\u00edsto pro souborov\u00e9 syst\u00e9my a LUNy.<\/p>\n<p><img decoding=\"async\" alt=\"FAST VP v \u00falo\u017ei\u0161ti Unity: jak to funguje\" src=\"\/wp-content\/uploads\/2020\/03\/00591e7155982ba216b490d3d7214f4c.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<h2>Pro\u010d pot\u0159ebuju tiering?<\/h2>\n<p>\nKr\u00e1tce a abstraktn\u011b: <i>abych dos\u00e1hl v\u011bt\u0161\u00edho v\u00fdsledku s minimem zdroj\u016f.<\/i> Pokud to \u0159ekneme konkr\u00e9tn\u011bji, v\u00fdsledkem se obvykle rozum\u00ed soubor vlastnost\u00ed \u00falo\u017en\u00fdch syst\u00e9m\u016f \u2013 rychlost a doba p\u0159\u00edstupu, n\u00e1klady na \u00falo\u017ei\u0161t\u011b a dal\u0161\u00ed. Minimem zdroj\u016f se mysl\u00ed co nejni\u017e\u0161\u00ed n\u00e1klady: pen\u011bz, energie a podobn\u011b. FAST VP pr\u00e1v\u011b implementuje mechanismy p\u0159erozd\u011blov\u00e1n\u00ed dat mezi r\u016fzn\u00fdmi \u00farovn\u011bmi v \u00falo\u017en\u00e9m syst\u00e9mu Unity\/Unity XT. Pokud mi v\u011b\u0159\u00edte, m\u016f\u017eete p\u0159esko\u010dit n\u00e1sleduj\u00edc\u00ed odstavec. Pro ostatn\u00ed \u0159eknu n\u011bco podrobn\u011bji.<\/p>\n<p>Spr\u00e1vn\u00e9 p\u0159erozd\u011blen\u00ed dat mezi \u00farovn\u011bmi \u00falo\u017ei\u0161t\u011b umo\u017e\u0148uje u\u0161et\u0159it na celkov\u00fdch n\u00e1kladech \u00falo\u017en\u00e9ho syst\u00e9mu, ob\u011btov\u00e1n\u00edm rychlosti p\u0159\u00edstupu k n\u011bkter\u00fdm z\u0159\u00eddka pou\u017e\u00edvan\u00fdm informac\u00edm a zv\u00fd\u0161en\u00edm v\u00fdkonu p\u0159esunem \u010dasto pou\u017e\u00edvan\u00fdch dat na rychlej\u0161\u00ed za\u0159\u00edzen\u00ed. N\u011bkdo by mohl nam\u00edtnout, \u017ee i bez tieringu norm\u00e1ln\u00ed administr\u00e1tor v\u00ed, kam jak\u00e1 data um\u00edstit, jak\u00e9 vlastnosti \u00falo\u017en\u00e9ho syst\u00e9mu jsou \u017e\u00e1douc\u00ed pro jeho \u00fakol atd. To je bezpochyby pravda, ale \u201eru\u010dn\u00ed\u201c p\u0159erozd\u011blov\u00e1n\u00ed dat m\u00e1 sv\u00e9 nev\u00fdhody:<\/p>\n<ul>\n<li>vy\u017eaduje \u010das a pozornost administr\u00e1tora; <\/li>\n<li>ne v\u017edy se poda\u0159\u00ed \u201ep\u0159eorganizovat\u201c zdroje \u00falo\u017en\u00e9ho syst\u00e9mu podle zm\u011bn\u011bn\u00fdch podm\u00ednek;<\/li>\n<li>miz\u00ed d\u016fle\u017eit\u00e1 v\u00fdhoda: unifikovan\u00fd p\u0159\u00edstup k prost\u0159edk\u016fm um\u00edst\u011bn\u00fdm na r\u016fzn\u00fdch \u00farovn\u00edch \u00falo\u017ei\u0161t\u011b. <\/li>\n<\/ul>\n<p>\nAby se spr\u00e1vci storage m\u00e9n\u011b ob\u00e1vali o jistotu zam\u011bstn\u00e1n\u00ed, dod\u00e1m, \u017ee efektivn\u00ed pl\u00e1nov\u00e1n\u00ed zdroj\u016f je tak\u00e9 nezbytn\u00e9. Te\u010f, kdy\u017e jsou \u00fakoly tieringu stru\u010dn\u011b nast\u00edn\u011bny, pod\u00edvejme se, co m\u016f\u017eeme o\u010dek\u00e1vat od FAST VP. Je \u010das vr\u00e1tit se k definici. Prvn\u00ed dv\u011b slova \u2013 Fully Automated \u2013 se p\u0159ekl\u00e1daj\u00ed jako \u201epln\u011b automatizovan\u00fd\u201c a znamenaj\u00ed, \u017ee rozd\u011blen\u00ed podle \u00farovn\u00ed prob\u00edh\u00e1 automaticky. A Virtual Pool je soubor dat, kter\u00fd zahrnuje zdroje z r\u016fzn\u00fdch \u00farovn\u00ed \u00falo\u017ei\u0161t\u011b. Takto to vypad\u00e1:<\/p>\n<p><img decoding=\"async\" alt=\"FAST VP v \u00falo\u017ei\u0161ti Unity: jak to funguje\" src=\"\/wp-content\/uploads\/2020\/03\/75259df2b7f65ad9707c1199dd88f7f6.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nP\u0159edem \u0159eknu, \u017ee FAST VP p\u0159esouv\u00e1 data pouze uvnit\u0159 jednoho poolu, nikoli mezi n\u011bkolika pooly. <\/p>\n<h2>\u00dakoly \u0159e\u0161en\u00e9 FAST VP<\/h2>\n<p>\nNejprve se pod\u00edvejme na to abstraktn\u011b. M\u00e1me pool a n\u011bjak\u00fd mechanismus, kter\u00fd m\u016f\u017ee redistribuovat data uvnit\u0159 tohoto poolu. P\u0159i pam\u011bti na to, \u017ee na\u0161\u00edm c\u00edlem je dos\u00e1hnout maxim\u00e1ln\u00ed v\u00fdkon, si polo\u017eme ot\u00e1zku: jak\u00fdmi zp\u016fsoby jej m\u016f\u017eeme dos\u00e1hnout? M\u016f\u017ee jich b\u00fdt n\u011bkolik, a zde m\u00e1 FAST VP co nab\u00eddnout u\u017eivateli, proto\u017ee technologie p\u0159edstavuje n\u011bco v\u00edc ne\u017e jen storage tiering. Zde jsou zp\u016fsoby, jak m\u016f\u017ee FAST VP zv\u00fd\u0161it v\u00fdkon poolu:<\/p>\n<ul>\n<li>Rozd\u011blen\u00ed dat mezi r\u016fzn\u00e9 typy disk\u016f, \u00farovn\u011b<\/li>\n<li>Rozd\u011blen\u00ed dat mezi disky jednoho typu<\/li>\n<li>Rozd\u011blen\u00ed dat p\u0159i roz\u0161\u00ed\u0159en\u00ed poolu<\/li>\n<\/ul>\n<p>\nNe\u017e budeme rozeb\u00edrat, jak jsou tyto \u00fakoly \u0159e\u0161eny, mus\u00edme zn\u00e1t n\u011bkter\u00e9 nezbytn\u00e9 skute\u010dnosti o fungov\u00e1n\u00ed FAST VP. FAST VP operuje s bloky ur\u010dit\u00e9 velikosti \u2013 256 megabajt\u016f. To je minim\u00e1ln\u00ed kontinu\u00e1ln\u00ed \u201ekousek\u201c dat, kter\u00fd m\u016f\u017ee b\u00fdt p\u0159esunut. V dokumentaci se mu \u0159\u00edk\u00e1 slice. Z pohledu FAST VP se v\u0161echny RAID skupiny skl\u00e1daj\u00ed z t\u011bchto \u201ekousk\u016f\u201c. Odpov\u00eddaj\u00edc\u00edm zp\u016fsobem se v\u0161echny statistiky vstupu a v\u00fdstupu shroma\u017e\u010fuj\u00ed pro takov\u00e9 bloky dat. Pro\u010d byla zvolena pr\u00e1v\u011b takov\u00e1 velikost bloku a bude zmen\u0161ena? Blok je dostate\u010dn\u011b velk\u00fd, ale to je kompromis mezi granularitou dat (men\u0161\u00ed velikost bloku \u2013 p\u0159esn\u011bj\u0161\u00ed rozd\u011blen\u00ed) a dostupn\u00fdmi v\u00fdpo\u010detn\u00edmi zdroji: p\u0159i st\u00e1vaj\u00edc\u00edch tvrd\u00fdch omezen\u00edch na opera\u010dn\u00ed pam\u011b\u0165 a velk\u00e9m po\u010dtu blok\u016f mohou statistick\u00e1 data zab\u00edrat p\u0159\u00edli\u0161 mnoho m\u00edsta a mno\u017estv\u00ed v\u00fdpo\u010dt\u016f se zv\u00fd\u0161\u00ed \u00fam\u011brn\u011b.<\/p>\n<h2>Jak FAST VP umis\u0165uje data v poolu. Politiky<\/h2>\n<p>\nPro spr\u00e1vu um\u00edst\u011bn\u00ed dat v r\u00e1mci poolu s aktivovan\u00fdm FAST VP existuj\u00ed tyto politiky:<\/p>\n<ul>\n<li>Nejvy\u0161\u0161\u00ed dostupn\u00e1 \u00farove\u0148<\/li>\n<li>Automatick\u00e1 \u00farove\u0148<\/li>\n<li>Za\u010dn\u011bte na vysok\u00e9 \u00farovni, pak automatick\u00e1 \u00farove\u0148 (v\u00fdchoz\u00ed)<\/li>\n<li>Nejni\u017e\u0161\u00ed dostupn\u00e1 \u00farove\u0148<\/li>\n<\/ul>\n<p>\nOvliv\u0148uj\u00ed jak po\u010d\u00e1te\u010dn\u00ed um\u00edst\u011bn\u00ed bloku (data jsou poprv\u00e9 zaps\u00e1na), tak n\u00e1sledn\u00e9 p\u0159ealokov\u00e1n\u00ed. Jakmile jsou data ulo\u017eena na disc\u00edch, p\u0159ealokace bude iniciov\u00e1na podle pl\u00e1nu nebo ru\u010dn\u011b.<\/p>\n<p>Nejvy\u0161\u0161\u00ed dostupn\u00e1 \u00farove\u0148 se sna\u017e\u00ed um\u00edstit nov\u00fd blok na nejv\u00fdkonn\u011bj\u0161\u00ed \u00farove\u0148. Pokud na n\u00ed nen\u00ed dostatek m\u00edsta, um\u00edst\u00ed je na dal\u0161\u00ed v\u00fdkonn\u011bj\u0161\u00ed \u00farove\u0148, ale pozd\u011bji mohou b\u00fdt data p\u0159esunuta na v\u00fdkonn\u011bj\u0161\u00ed \u00farove\u0148 (pokud je k dispozici m\u00edsto nebo pokud nahrad\u00ed jin\u00e1 data). Automatick\u00e1 \u00farove\u0148 umis\u0165uje nov\u00e1 data na r\u016fzn\u00e9 \u00farovn\u011b v z\u00e1vislosti na velikosti dostupn\u00e9ho prostoru, a p\u0159ealokuj\u00ed se podle popt\u00e1vky a voln\u00e9ho m\u00edsta. Za\u010dn\u011bte na vysok\u00e9 \u00farovni, pak automatick\u00e1 \u00farove\u0148 \u2013 politikou v\u00fdchoz\u00ed a tak\u00e9 doporu\u010den\u00e1. P\u0159i po\u010d\u00e1te\u010dn\u00edm um\u00edst\u011bn\u00ed funguje jako nejvy\u0161\u0161\u00ed dostupn\u00e1 \u00farove\u0148, a pak doch\u00e1z\u00ed k p\u0159esunu dat v z\u00e1vislosti na jejich statistik\u00e1ch vyu\u017eit\u00ed. Politika nejni\u017e\u0161\u00ed dostupn\u00e9 \u00farovn\u011b se sna\u017e\u00ed um\u00edstit data na nejm\u00e9n\u011b v\u00fdkonnou \u00farove\u0148. <\/p>\n<p>P\u0159enos dat prob\u00edh\u00e1 s n\u00edzkou prioritou, aby nenaru\u0161oval u\u017eite\u010dnou \u010dinnost SDD, nicm\u00e9n\u011b existuje nastaven\u00ed \u201eData relocation rate\u201c, kter\u00e9 m\u011bn\u00ed prioritu. Zde je zvl\u00e1\u0161tnost: ne v\u0161echny datov\u00e9 bloky maj\u00ed stejnou po\u0159ad\u00ed p\u0159ealokace. Nap\u0159\u00edklad bloky ozna\u010den\u00e9 jako metadata budou p\u0159esunuty na rychlej\u0161\u00ed \u00farove\u0148 jako prvn\u00ed. Metadata jsou, jak se to d\u00e1 \u0159\u00edct, \u201edata o datech\u201c, ur\u010dit\u00e1 dodate\u010dn\u00e1 informace, kter\u00e1 nen\u00ed u\u017eivatelsk\u00fdmi daty, ale uchov\u00e1v\u00e1 jejich popis. Nap\u0159\u00edklad informace v souborov\u00e9m syst\u00e9mu o tom, ve kter\u00e9m bloku se nach\u00e1z\u00ed konkr\u00e9tn\u00ed soubor. Rychlost p\u0159\u00edstupu k dat\u016fm tedy z\u00e1vis\u00ed na rychlosti p\u0159\u00edstupu k metadat\u016fm. Vzhledem k tomu, \u017ee metadata jsou obvykle mnohem men\u0161\u00ed, o\u010dek\u00e1v\u00e1 se v\u011bt\u0161\u00ed v\u00fdhoda z jejich p\u0159esouv\u00e1n\u00ed na v\u00fdkonn\u011bj\u0161\u00ed disky.<\/p>\n<h2>Krit\u00e9ria, kter\u00e1 Fast VP pou\u017e\u00edv\u00e1 v praxi<\/h2>\n<p>\nHlavn\u00edm krit\u00e9riem pro ka\u017ed\u00fd blok, pokud to velmi zjednodu\u0161\u00edme, je charakteristika \"popularity\" dat, kter\u00e1 z\u00e1vis\u00ed na po\u010dtu operac\u00ed \u010dten\u00ed a z\u00e1pisu dan\u00e9ho datov\u00e9ho fragmentu. Tato charakteristika se u n\u00e1s naz\u00fdv\u00e1 \u201eTeplota\u201c. Existuj\u00ed popul\u00e1rn\u00ed (hot) data, kter\u00e1 jsou \"teplej\u0161\u00ed\" ne\u017e nepopul\u00e1rn\u00ed. Vypo\u010d\u00edt\u00e1v\u00e1 se pravideln\u011b, ve v\u00fdchoz\u00edm nastaven\u00ed v intervalu jedn\u00e9 hodiny. <\/p>\n<p>Funkce v\u00fdpo\u010dtu teploty m\u00e1 n\u00e1sleduj\u00edc\u00ed vlastnosti:<\/p>\n<ul>\n<li>P\u0159i absenci vstupu\/v\u00fdstupu data s \u010dasem \"ochlazuj\u00ed\".<\/li>\n<li>P\u0159i v\u00edce m\u00e9n\u011b konstantn\u00ed z\u00e1t\u011b\u017ei v \u010dase teplota nejprve roste a pot\u00e9 se stabilizuje v ur\u010dit\u00e9m rozmez\u00ed.<\/li>\n<\/ul>\n<p>\nD\u00e1le se zohled\u0148uj\u00ed politiky popsan\u00e9 v\u00fd\u0161e a voln\u00e9 m\u00edsto na ka\u017ed\u00e9m tieru. Pro n\u00e1zornost uvedu obr\u00e1zek z dokumentace. Tady jsou \u010derven\u011b, \u017elut\u011b a mod\u0159e ozna\u010deny bloky s vysokou, st\u0159edn\u00ed a n\u00edzkou teplotou.<\/p>\n<p><img decoding=\"async\" alt=\"FAST VP v \u00falo\u017ei\u0161ti Unity: jak to funguje\" src=\"\/wp-content\/uploads\/2020\/03\/4815ae20d2e33a8f7f47279da0965ae0.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nAle vra\u0165me se k \u00fakol\u016fm. Tak\u017ee m\u016f\u017eeme za\u010d\u00edt rozeb\u00edrat to, co se d\u011bl\u00e1 k \u0159e\u0161en\u00ed \u00faloh FAST VP.<\/p>\n<h4>A. Rozd\u011blen\u00ed dat mezi r\u016fzn\u00e9 typy disk\u016f, \u00farovn\u011b<\/h4>\n<p>\nTo je hlavn\u00ed \u00fakol FAST VP. Ostatn\u00ed jsou v ur\u010dit\u00e9m smyslu odvozen\u00e9 od n\u011bj. V z\u00e1vislosti na zvolen\u00e9 politice budou data rozd\u011blena mezi r\u016fzn\u00e9 \u00farovn\u011b ukl\u00e1d\u00e1n\u00ed. Nejprve se zohled\u0148uje politika um\u00edst\u011bn\u00ed, pot\u00e9 teplota blok\u016f a velikost\/r\u00fdchlost RAID skupin. <\/p>\n<p>Pro politiky Nejvy\u0161\u0161\u00ed\/N\u011bkolik dostupn\u00fdch tier\u016f je to dost jednoduch\u00e9. Pro zb\u00fdvaj\u00edc\u00ed dv\u011b situace je to tak. Data se rozd\u011bluj\u00ed mezi r\u016fzn\u00e9 \u00farovn\u011b s ohledem na velikost a v\u00fdkon RAID skupin: tak, aby pom\u011br celkov\u00e9 \u201eteploty\u201c blok\u016f k \u201epodm\u00edn\u011bn\u00e9 maxim\u00e1ln\u00ed v\u00fdkonnosti\u201c ka\u017ed\u00e9 RAID skupiny byl p\u0159ibli\u017en\u011b stejn\u00fd. T\u00edmto zp\u016fsobem se z\u00e1t\u011b\u017e rozd\u011bluje v\u00edce m\u00e9n\u011b rovnom\u011brn\u011b. V\u00edce \u017e\u00e1dan\u00e1 data se p\u0159esouvaj\u00ed na rychl\u00e9 nosi\u010de, z\u0159\u00eddka pou\u017e\u00edvan\u00e1 \u2013 na pomalej\u0161\u00ed. Ide\u00e1ln\u011b by rozd\u011blen\u00ed m\u011blo vypadat p\u0159ibli\u017en\u011b takto: <\/p>\n<p><img decoding=\"async\" alt=\"FAST VP v \u00falo\u017ei\u0161ti Unity: jak to funguje\" src=\"\/wp-content\/uploads\/2020\/03\/08ecbdc3dbf0409ba67eaf51eed24745.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<h4>B. Rozd\u011blen\u00ed dat mezi disky stejn\u00e9ho typu<\/h4>\n<p>\nPamatujete, na za\u010d\u00e1tku jsem psal, \u017ee nosi\u010de informac\u00ed z <b>jednoho nebo n\u011bkolika<\/b> Jak se \u00farovn\u011b spojuj\u00ed do jednoho poolu? U jedin\u00e9ho levelu pro FAST VP tak\u00e9 existuje pr\u00e1ce. Aby byla v\u00fdkonnost jak\u00e9koli \u00farovn\u011b maxim\u00e1ln\u00ed, je vhodn\u00e9 rozlo\u017eit data rovnom\u011brn\u011b mezi disky. To teoreticky umo\u017en\u00ed dos\u00e1hnout maxim\u00e1ln\u00edho po\u010dtu IOPS. Data uvnit\u0159 RAID skupiny lze pova\u017eovat za rovnom\u011brn\u011b rozlo\u017een\u00e1 mezi disky, av\u0161ak mezi RAID skupinami to rozhodn\u011b nen\u00ed v\u017edy tak. V p\u0159\u00edpad\u011b disbalance FAST VP p\u0159esune data mezi RAID skupinami \u00fam\u011brn\u011b jejich objemu a \u201epodm\u00edn\u011bn\u00e9 v\u00fdkonnosti\u201c (v \u010d\u00edseln\u00e9m vyj\u00e1d\u0159en\u00ed). Pro n\u00e1zornost uk\u00e1\u017eu sch\u00e9ma rebalance mezi t\u0159emi RAID skupinami:<\/p>\n<p><img decoding=\"async\" alt=\"FAST VP v \u00falo\u017ei\u0161ti Unity: jak to funguje\" src=\"\/wp-content\/uploads\/2020\/03\/df92c278bbc9138beb109de0c05db705.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<h4>V. Rozlo\u017een\u00ed dat p\u0159i roz\u0161\u00ed\u0159en\u00ed poolu<\/h4>\n<p>\nTento \u00fakol je zvl\u00e1\u0161tn\u00edm p\u0159\u00edpadem p\u0159edchoz\u00edho a prov\u00e1d\u00ed se, kdy\u017e je do poolu p\u0159id\u00e1na RAID skupina. Aby nov\u011b p\u0159idan\u00e1 RAID skupina nez\u016fstala nevyu\u017eita, \u010d\u00e1st dat bude p\u0159esunuta na ni, a t\u00edm bude zat\u00ed\u017een\u00ed v\u0161ech RAID skupin p\u0159erozd\u011bleno.<\/p>\n<h2>Vyrovn\u00e1v\u00e1n\u00ed opot\u0159eben\u00ed SSD<\/h2>\n<p>\nPomoc\u00ed vyrovn\u00e1v\u00e1n\u00ed opot\u0159eben\u00ed m\u016f\u017ee FAST VP prodlou\u017eit \u017eivotnost SSD, i kdy\u017e tato funkce p\u0159\u00edmo nesouvis\u00ed s Storage Tiering. Vzhledem k tomu, \u017ee ji\u017e existuj\u00ed \u00fadaje o teplot\u011b, tak\u00e9 se zohled\u0148uje po\u010det z\u00e1pisov\u00fdch operac\u00ed, my um\u00edme p\u0159esouvat bloky dat, bylo by logick\u00e9, aby FAST VP tuto \u00falohu tak\u00e9 vy\u0159e\u0161ilo.<\/p>\n<p>V p\u0159\u00edpad\u011b, \u017ee po\u010det z\u00e1pis\u016f do jedn\u00e9 RAID skupiny v\u00fdrazn\u011b p\u0159evy\u0161uje po\u010det z\u00e1pis\u016f do druh\u00e9, FAST VP p\u0159erozd\u011bl\u00ed data v souladu s po\u010dtem zapisovac\u00edch operac\u00ed. Z jedn\u00e9 strany to sni\u017euje z\u00e1t\u011b\u017e a \u0161et\u0159\u00ed zdroje n\u011bkter\u00fdch disk\u016f, z druh\u00e9 strany to p\u0159id\u00e1v\u00e1 \u201epr\u00e1ci\u201c pro m\u00e9n\u011b zat\u00ed\u017een\u00e9, \u010d\u00edm\u017e zvy\u0161uje celkovou v\u00fdkonnost.<\/p>\n<p>FAST VP si tak bere na sebe tradi\u010dn\u00ed \u00fakoly Storage Tiering a d\u011bl\u00e1 je\u0161t\u011b o n\u011bco v\u00edce. To v\u0161e umo\u017e\u0148uje efektivn\u011b ukl\u00e1dat data v \u00falo\u017ei\u0161t\u00edch rodiny Unity.<\/p>\n<h2>N\u011bkolik rad<\/h2>\n<p><\/p>\n<ol>\n<li>Nedopus\u0165te, abyste opomn\u011bli \u010d\u00edst dokumentaci. Existuj\u00ed nejlep\u0161\u00ed praktiky, kter\u00e9 funguj\u00ed pom\u011brn\u011b dob\u0159e. Pokud se jimi budete \u0159\u00eddit, obvykle nevznikaj\u00ed z\u00e1va\u017en\u00e9 probl\u00e9my. Ostatn\u00ed rady v\u011bt\u0161inou opakuj\u00ed nebo dopl\u0148uj\u00ed tyto.<\/li>\n<li>Pokud jste nastavili a aktivovali FAST VP, je lep\u0161\u00ed ho nechat zapnut\u00fd. Nechte ho rozd\u011blovat data v p\u0159id\u011blen\u00e9m \u010dase a postupn\u011b, m\u00edsto toho, aby se to d\u011blalo jednou za rok a v\u00e1\u017en\u011b ovlivnilo v\u00fdkon jin\u00fdch \u00faloh. V takov\u00fdch p\u0159\u00edpadech m\u016f\u017ee redistribution dat trvat dlouho.<\/li>\n<li>Pe\u010dliv\u011b zva\u017ete v\u00fdb\u011br okna pro relokaci. A\u010dkoliv je to z\u0159ejm\u00e9, pokuste se vybrat \u010das s nejmen\u0161\u00edm zat\u00ed\u017een\u00edm pro Unity a vy\u010dle\u0148te dostate\u010dn\u00e9 \u010dasov\u00e9 okno.<\/li>\n<li>Pl\u00e1nujte roz\u0161\u00ed\u0159en\u00ed \u00falo\u017ei\u0161t\u011b, d\u011blejte to v\u010das. To je obecn\u00e9 doporu\u010den\u00ed, kter\u00e9 plat\u00ed i pro FAST VP. Pokud je objem voln\u00e9ho m\u00edsta velmi mal\u00fd, m\u016f\u017ee se p\u0159esun dat zpomalit nebo st\u00e1t nemo\u017en\u00fdm. Zvl\u00e1\u0161\u0165, pokud jste ignorovali bod 2.<\/li>\n<li>P\u0159i roz\u0161i\u0159ov\u00e1n\u00ed poolu se zapnut\u00fdm FAST VP byste nem\u011bli za\u010d\u00ednat s nejpomalej\u0161\u00edmi disky. To znamen\u00e1, bu\u010f p\u0159id\u011blujte v\u0161echny pl\u00e1novan\u00e9 RAID skupiny najednou, nebo nejprve p\u0159idejte nejrychlej\u0161\u00ed disky. V tomto p\u0159\u00edpad\u011b p\u0159enos dat na nov\u00e9 \"rychl\u00e9\" disky zv\u00fd\u0161\u00ed celkovou rychlost poolu. Naopak, pokud za\u010dnete s \"pomalej\u0161\u00edmi\" disky, m\u016f\u017eete se dostat do velmi nep\u0159\u00edjemn\u00e9 situace. Nejprve dojde k p\u0159enosu dat na nov\u00e9, relativn\u011b pomal\u00e9 disky a potom, p\u0159i p\u0159id\u00e1n\u00ed rychlej\u0161\u00edch, opa\u010dn\u00fdm sm\u011brem. Zde jsou nuance spojen\u00e9 s r\u016fzn\u00fdmi politikami FAST VP, ale v obecn\u00e9m p\u0159\u00edpad\u011b je takov\u00e1 situace mo\u017en\u00e1.<\/li>\n<\/ol>\n<p>\nPokud se d\u00edv\u00e1te na tento produkt, m\u016f\u017eete vyzkou\u0161et Unity v akci zdarma sta\u017een\u00edm Unity VSA virtu\u00e1ln\u00edho za\u0159\u00edzen\u00ed.<\/p>\n<p><img decoding=\"async\" alt=\"FAST VP v \u00falo\u017ei\u0161ti Unity: jak to funguje\" src=\"\/wp-content\/uploads\/2020\/03\/a6ce6116c4ba028b14447157a270e5d2.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nNa z\u00e1v\u011br materi\u00e1lu sd\u00edl\u00edm n\u011bkolik u\u017eite\u010dn\u00fdch odkaz\u016f:<\/p>\n<ul>\n<li>Str\u00e1nka <noindex><a rel=\"nofollow\" href=\"https:\/\/www.delltechnologies.com\/ru-ru\/storage\/unity.htm\">\u00dalo\u017ei\u0161t\u011b Unity<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/community.emc.com\/docs\/DOC-70939\">Dell EMC Unity: Teorie provozu FAST VP<\/a><\/noindex> \u2013 stru\u010dn\u00fd popis funkce<\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/www.dellemc.com\/en-us\/collaterals\/unauth\/white-papers\/products\/storage\/h15086-emc-unity-fast-technology-overview.pdf\">Podrobn\u011bj\u0161\u00ed a podrobn\u011bj\u0161\u00ed popis<\/a><\/noindex>, form\u00e1t pdf<\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/www.dellemc.com\/en-us\/products\/trial-software-download\/index.htm\">Unity VSA\/Cloud edition<\/a><\/noindex><\/li>\n<\/ul>\n<p><\/p>\n<h2> Z\u00e1v\u011br <\/h2>\n<p>\nR\u00e1d bych napsal o mnoha v\u011bcech, ale ch\u00e1pu, \u017ee ne v\u0161echny detaily budou \u010dten\u00e1\u0159e zaj\u00edmat. Nap\u0159\u00edklad bych mohl podrobn\u011bji hovo\u0159it o krit\u00e9ri\u00edch, podle kter\u00fdch FAST VP rozhoduje o p\u0159enosu dat, o procesech anal\u00fdzy statistiky vstupu a v\u00fdstupu. Tak\u00e9 jsem se v\u016fbec nezm\u00ednil o t\u00e9matu spolupr\u00e1ce s <noindex><a rel=\"nofollow\" href=\"https:\/\/www.dellemc.com\/resources\/en-us\/asset\/white-papers\/products\/storage\/h16289-dell_emc_unity-dynamic_pools.pdf\">Dynamick\u00e9 pooly<\/a><\/noindex>, co\u017e by si zaslou\u017eilo samostatn\u00fd \u010dl\u00e1nek. Mohli bychom dokonce spekulovat o budouc\u00edm v\u00fdvoji t\u00e9to technologie. Douf\u00e1m, \u017ee to nebylo nudn\u00e9 a nezapomn\u011bl jsem v\u00e1s unavit. Na shledanou!<br \/>\n<br \/>Zdroj: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/dell_technologies\/blog\/493136\/\">habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0421\u0435\u0433\u043e\u0434\u043d\u044f \u0440\u0435\u0447\u044c \u043f\u043e\u0439\u0434\u0435\u0442 \u043e\u0431 \u0438\u043d\u0442\u0435\u0440\u0435\u0441\u043d\u043e\u0439 \u0442\u0435\u0445\u043d\u043e\u043b\u043e\u0433\u0438\u0438, \u0440\u0435\u0430\u043b\u0438\u0437\u043e\u0432\u0430\u043d\u043d\u043e\u0439 \u0432 \u0421\u0425\u0414 Unity\/Unity XT, \u2013 FAST VP. \u0415\u0441\u043b\u0438 \u0432\u044b \u0432\u043f\u0435\u0440\u0432\u044b\u0435 \u0443\u0441\u043b\u044b\u0448\u0430\u043b\u0438 \u043e Unity, \u0442\u043e \u043f\u043e \u0441\u0441\u044b\u043b\u043a\u0435 \u0432 \u043a\u043e\u043d\u0446\u0435 \u0441\u0442\u0430\u0442\u044c\u0438 \u043c\u043e\u0436\u043d\u043e \u043e\u0437\u043d\u0430\u043a\u043e\u043c\u0438\u0442\u044c\u0441\u044f \u0441 \u0445\u0430\u0440\u0430\u043a\u0442\u0435\u0440\u0438\u0441\u0442\u0438\u043a\u0430\u043c\u0438 \u0441\u0438\u0441\u0442\u0435\u043c\u044b. \u0412 \u043f\u0440\u043e\u0435\u043a\u0442\u043d\u043e\u0439 \u043a\u043e\u043c\u0430\u043d\u0434\u0435 Dell EMC \u044f \u0440\u0430\u0431\u043e\u0442\u0430\u043b \u043d\u0430\u0434 FAST VP \u0431\u043e\u043b\u0435\u0435 \u0433\u043e\u0434\u0430. \u0421\u0435\u0433\u043e\u0434\u043d\u044f \u0445\u043e\u0447\u0443 \u0440\u0430\u0441\u0441\u043a\u0430\u0437\u0430\u0442\u044c \u043e\u0431 \u044d\u0442\u043e\u0439 \u0442\u0435\u0445\u043d\u043e\u043b\u043e\u0433\u0438\u0438 \u043f\u043e\u0434\u0440\u043e\u0431\u043d\u0435\u0435 \u0438 \u0440\u0430\u0441\u043a\u0440\u044b\u0442\u044c \u043d\u0435\u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u0434\u0435\u0442\u0430\u043b\u0438 \u0435\u0435 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":75578,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-75577","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - 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