{"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\/ro\/blog\/administrirovanie\/fast-vp-v-shd-unity-kak-eto-rabotaet","title":{"rendered":"FAST VP \u00een sistemul de stocare Unity: cum func\u021bioneaz\u0103","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Ast\u0103zi vom vorbi despre o tehnologie interesant\u0103 implementat\u0103 \u00een sistemul de stocare Unity\/Unity XT, \u2013 FAST VP. Dac\u0103 auzi\u021bi pentru prima dat\u0103 despre Unity, pute\u021bi consulta specifica\u021biile sistemului prin linkul de la sf\u00e2r\u0219itul articolului. \u00cen echipa de proiect Dell EMC am lucrat la FAST VP mai bine de un an. Ast\u0103zi vreau s\u0103 v\u0103 povestesc mai \u00een detaliu despre aceast\u0103 tehnologie \u0219i s\u0103 dezv\u0103lui c\u00e2teva detalii ale implement\u0103rii sale. Desigur, doar acelea care \u00eemi sunt permise s\u0103 le dezv\u0103lui. Dac\u0103 sunte\u021bi interesat de \u00eentrebarile legate de stocarea eficient\u0103 a datelor sau pur \u0219i simplu nu v-a\u021bi l\u0103murit complet cu documenta\u021bia, atunci acest articol va fi cu siguran\u021b\u0103 util \u0219i interesant. <\/p>\n<p><img decoding=\"async\" alt=\"FAST VP \u00een sistemul de stocare Unity: cum func\u021bioneaz\u0103\" 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 \/>\nVoi spune imediat ce nu va con\u021bine materialul. Nu va include cercetarea concuren\u021bilor \u0219i compara\u021bia cu ace\u0219tia. De asemenea, nu inten\u021bionez s\u0103 vorbesc despre tehnologii similare din open source, pentru c\u0103 cititorul curios \u0219tie deja despre ele. \u0218i, desigur, nu inten\u021bionez s\u0103 fac nicio reclam\u0103.<\/p>\n<h2>Stocarea pe niveluri. Scopurile \u0219i obiectivele FAST VP<\/h2>\n<p>\nFAST VP este prescurtarea pentru Fully Automated Storage Tiering for Virtual Pool. Sun\u0103 complicat? Nimic, acum ne vom l\u0103muri. Tiering-ul este un mod de organizare a stoc\u0103rii datelor, \u00een care exist\u0103 mai multe niveluri (tiers) unde aceste date sunt stocate. Fiecare are propriile caracteristici. Cele mai importante sunt: performan\u021ba, volumul \u0219i pre\u021bul pentru o unitate de informa\u021bie. Desigur, exist\u0103 o interconexiune \u00eentre ele.<\/p>\n<p>O caracteristic\u0103 important\u0103 a tiering-ului este c\u0103 accesul la date este uniform, indiferent de nivelul de stocare pe care se afl\u0103 \u00een acel moment, iar dimensiunea pool-ului este egal\u0103 cu suma dimensiunilor resurselor care \u00eel compun. Aici se afl\u0103 diferen\u021bele fa\u021b\u0103 de cache: dimensiunea cache-ului nu se adaug\u0103 la volumul total al resursei (pool-ului \u00een acest caz), iar datele din cache \u00ee\u0219i duplic\u0103 un anumit fragment de date de pe suportul principal (sau vor duplica, dac\u0103 datele din cache nu au fost \u00eenc\u0103 scrise). De asemenea, distribu\u021bia datelor pe niveluri este ascuns\u0103 de utilizator. Adic\u0103, utilizatorul nu vede exact ce date sunt plasate pe fiecare nivel, de\u0219i poate influen\u021ba acest lucru indirect, prin stabilirea politicilor (despre acestea mai t\u00e2rziu).<\/p>\n<p>Acum s\u0103 ne uit\u0103m la caracteristicile implement\u0103rii stoc\u0103rii pe niveluri \u00een Unity. \u00cen Unity se disting 3 niveluri, sau tiers:<\/p>\n<ul>\n<li>Performan\u021b\u0103 extrem\u0103 (SSDs)<\/li>\n<li>Performan\u021b\u0103 (SAS HDD 10k\/15k RPM)<\/li>\n<li>Capacitate (NL-SAS HDD 7200 RPM)<\/li>\n<\/ul>\n<p>\nEle sunt prezentate \u00een ordine descresc\u0103toare a performan\u021bei \u0219i pre\u021bului. \u00cen Extreme performance sunt incluse exclusiv unit\u0103\u021bi de stocare de tip SSD. Celelalte dou\u0103 niveluri con\u021bin unit\u0103\u021bi pe discuri magnetice, diferite prin viteza de rota\u021bie \u0219i, prin urmare, prin performan\u021b\u0103.<\/p>\n<p>Discurile de stocare din acela\u0219i nivel \u0219i dimensiune sunt grupate \u00eentr-un RAID, form\u00e2nd un RAID group; informa\u021biile despre nivelurile RAID disponibile \u0219i recomandate pot fi g\u0103site \u00een documenta\u021bia oficial\u0103. Grupurile RAID din unul sau mai multe niveluri formeaz\u0103 pool-uri de stocare (Storage pool), din care este apoi distribuit spa\u021biul liber. Apoi, din pool este alocat spa\u021biu pentru sisteme de fi\u0219iere \u0219i LUN-uri.<\/p>\n<p><img decoding=\"async\" alt=\"FAST VP \u00een sistemul de stocare Unity: cum func\u021bioneaz\u0103\" src=\"\/wp-content\/uploads\/2020\/03\/00591e7155982ba216b490d3d7214f4c.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<h2>De ce am nevoie de Tiering?<\/h2>\n<p>\nPe scurt \u0219i abstract: <i>pentru a ob\u021bine un rezultat mai bun, folosind un minim de resurse.<\/i> Dac\u0103 ne referim mai concret, rezultatul se refer\u0103 de obicei la un ansamblu de caracteristici ale SDD \u2013 viteza \u0219i timpul de acces, costul de stocare \u0219i altele. Minim de resurse se refer\u0103 la cele mai mici cheltuieli: bani, energie \u0219i a\u0219a mai departe. FAST VP implementeaz\u0103 tocmai mecanismele de redistribuire a datelor pe diferite niveluri \u00een SDD Unity\/Unity XT. Dac\u0103 m\u0103 crede\u021bi, pute\u021bi s\u0103ri la urm\u0103torul paragraf. Pentru ceilal\u021bi, v\u0103 voi explica pu\u021bin mai \u00een detaliu.<\/p>\n<p>O distribu\u021bie corect\u0103 a datelor pe nivelurile de stocare permite economisirea pe costul total al SDD-ului, sacrific\u00e2nd viteza de acces la unele informa\u021bii rar utilizate, \u0219i \u00eembun\u0103t\u0103\u021be\u0219te performan\u021ba, mut\u00e2nd datele utilizate frecvent pe suporturi mai rapide. Aici cineva ar putea obiecta c\u0103 \u0219i f\u0103r\u0103 tiering, un administrator normal \u0219tie unde s\u0103 plaseze care date, ce caracteristici ale SDD-ului sunt dorite pentru sarcina sa etc. F\u0103r\u0103 \u00eendoial\u0103, este adev\u0103rat, dar distribu\u021bia datelor \u201emanual\u201d are propriile dezavantaje:<\/p>\n<ul>\n<li>necesit\u0103 timp \u0219i aten\u021bie din partea administratorului; <\/li>\n<li>nu reu\u0219e\u0219te \u00eentotdeauna s\u0103 \u201ereconfigureze\u201d resursele SDD-ului \u00een func\u021bie de condi\u021biile schimbate;<\/li>\n<li>dispare un avantaj important: accesul unificat la resursele aflate pe diferite niveluri de stocare. <\/li>\n<\/ul>\n<p>\nPentru a reduce \u00eengrijor\u0103rile administratorilor de storage legate de securitatea locului de munc\u0103, vreau s\u0103 adaug c\u0103 o planificare judicioas\u0103 a resurselor este, de asemenea, necesar\u0103. Acum, c\u00e2nd sarcinile de tiering sunt prezentate \u00een linii mari, s\u0103 vedem ce putem a\u0219tepta de la FAST VP. Aici este momentul s\u0103 revenim la defini\u021bie. Primele dou\u0103 cuvinte \u2013 Fully Automated \u2013 se traduc literal ca \u201ecomplet automatizat\u201d \u0219i \u00eenseamn\u0103 c\u0103 distribu\u021bia pe niveluri se face automat. Iar Virtual Pool este un pool de date care reune\u0219te resurse din diferite niveluri de stocare. Iat\u0103 cum arat\u0103:<\/p>\n<p><img decoding=\"async\" alt=\"FAST VP \u00een sistemul de stocare Unity: cum func\u021bioneaz\u0103\" src=\"\/wp-content\/uploads\/2020\/03\/75259df2b7f65ad9707c1199dd88f7f6.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n\u00cenaint\u00e2ndu-m\u0103, voi men\u021biona c\u0103 FAST VP mut\u0103 date doar \u00een cadrul unui singur pool, nu \u00eentre mai multe pools. <\/p>\n<h2>Sarcinile rezolvate de FAST VP<\/h2>\n<p>\nS\u0103 discut\u0103m mai \u00eent\u00e2i la nivel abstract. Avem un pool \u0219i un mecanism care poate redistribui datele \u00een interiorul acestui pool. \u021ain\u00e2nd cont c\u0103 scopul nostru este de a atinge performan\u021ba maxim\u0103, s\u0103 ne punem \u00eentrebarea: prin ce metode putem realiza acest lucru? Pot exista mai multe modalit\u0103\u021bi, iar FAST VP are multe de oferit utilizatorului, deoarece tehnologia reprezint\u0103 ceva mai mult dec\u00e2t simplu tiering de storage. Iat\u0103 cum poate FAST VP s\u0103 creasc\u0103 performan\u021ba pool-ului:<\/p>\n<ul>\n<li>Distribu\u021bia datelor pe diferite tipuri de discuri, niveluri<\/li>\n<li>Distribu\u021bia datelor \u00eentre discuri de acela\u0219i tip<\/li>\n<li>Redistribu\u021bia datelor atunci c\u00e2nd pool-ul este extins<\/li>\n<\/ul>\n<p>\n\u00cenainte de a analiza modul \u00een care aceste sarcini sunt \u00eendeplinite, trebuie s\u0103 \u0219tim c\u00e2teva fapte necesare despre modul \u00een care func\u021bioneaz\u0103 FAST VP. FAST VP opereaz\u0103 pe blocuri de dimensiuni specifice \u2013 256 megabi\u021bi. Aceasta este dimensiunea minim\u0103 a unui \u201ebucat\u0103\u201d continu\u0103 de date care poate fi mutat\u0103. \u00cen documenta\u021bie, i se spune pur \u0219i simplu: slice. Din perspectiva FAST VP, toate grupurile RAID sunt formate dintr-un set de astfel de \u201ebuc\u0103\u021bi\u201d. Prin urmare, toate statisticile de intrare-ie\u0219ire sunt acumulate pentru aceste blocuri de date. De ce a fost ales acest dimensiune a blocului \u0219i va fi redus? Blocul este destul de mare, dar reprezint\u0103 un compromis \u00eentre granularitatea datelor (cu c\u00e2t dimensiunea blocului este mai mic\u0103 \u2013 cu at\u00e2t distribu\u021bia este mai precis\u0103) \u0219i resursele computa\u021bionale disponibile: av\u00e2nd \u00een vedere limit\u0103rile existente ale memoriei RAM \u0219i num\u0103rul mare de blocuri, statisticile de date pot ocupa prea mult, iar num\u0103rul de calcule va cre\u0219te propor\u021bional.<\/p>\n<h2>Cum FAST VP plaseaz\u0103 datele \u00een pool. Politici<\/h2>\n<p>\nPentru a gestiona plasarea datelor \u00eentr-un pool cu FAST VP activat, exist\u0103 urm\u0103toarele politici:<\/p>\n<ul>\n<li>Cel mai \u00eenalt nivel disponibil<\/li>\n<li>Auto-Tier<\/li>\n<li>\u00cencepe de sus, apoi Auto-Tier (implicit)<\/li>\n<li>Cel mai sc\u0103zut nivel disponibil<\/li>\n<\/ul>\n<p>\nAcestea influen\u021beaz\u0103 at\u00e2t plasarea ini\u021bial\u0103 a blocului (c\u00e2nd datele sunt scrise pentru prima dat\u0103), c\u00e2t \u0219i redistribu\u021bia ulterioar\u0103. Odat\u0103 ce datele sunt plasate pe discuri, redistribu\u021bia va fi ini\u021biat\u0103 conform unui program sau manual.<\/p>\n<p>Cel mai \u00eenalt nivel disponibil \u00eencearc\u0103 s\u0103 plaseze un nou bloc la cel mai performant nivel. Dac\u0103 nu este suficient spa\u021biu, va trece la urm\u0103torul nivel de performan\u021b\u0103, dar apoi datele pot fi mutate la un nivel mai performant (dac\u0103 exist\u0103 spa\u021biu sau prin eliminarea altor date). Auto-Tier plaseaz\u0103 datele noi la diferite niveluri \u00een func\u021bie de dimensiunea spa\u021biului disponibil, iar redistribu\u021bia se face \u00een func\u021bie de cerere \u0219i spa\u021biul liber. \u00cencepe de sus, apoi Auto-Tier \u2013 politica implicit\u0103 \u0219i de asemenea recomandat\u0103. La plasarea ini\u021bial\u0103 func\u021bioneaz\u0103 ca cel mai \u00eenalt nivel disponibil, iar ulterior datele sunt mutate \u00een func\u021bie de statisticile lor de utilizare. Politica cel mai sc\u0103zut nivel disponibil caut\u0103 s\u0103 plaseze datele la cel mai pu\u021bin performant nivel. <\/p>\n<p>Mutarea datelor se desf\u0103\u0219oar\u0103 cu prioritate sc\u0103zut\u0103 pentru a nu afecta activitatea util\u0103 a SVD, \u00eens\u0103 exist\u0103 o setare \u201eRata de relocare a datelor\u201d care schimb\u0103 prioritatea. Aici exist\u0103 o particularitate: nu toate blocurile de date au aceea\u0219i ordine de redistribuire. De exemplu, blocurile marcate ca metadate vor fi mutate la un nivel mai rapid \u00een primul r\u00e2nd. Metadatele reprezint\u0103, ca s\u0103 spunem a\u0219a, \u201edate despre date\u201d, o informa\u021bie suplimentar\u0103 care nu este datele utilizatorului, dar care p\u0103streaz\u0103 descrierea acestora. De exemplu, informa\u021bia din sistemul de fi\u0219iere despre \u00een care bloc se afl\u0103 un anumit fi\u0219ier. A\u0219adar, viteza de acces la date depinde de viteza de acces la metadate. Av\u00e2nd \u00een vedere c\u0103 metadatele sunt de obicei mult mai mici ca dimensiune, se a\u0219teapt\u0103 o c\u00e2\u0219tigare mai mare prin mutarea lor pe discuri mai performante.<\/p>\n<h2>Criteriile pe care Fast VP le utilizeaz\u0103 \u00een func\u021bionare<\/h2>\n<p>\nCriteriul principal pentru fiecare bloc, \u00een termeni foarte generali, este caracteristica de \u00abcerere\u00bb a datelor, care depinde de num\u0103rul de opera\u021biuni de citire \u0219i scriere ale unui fragment de date. Aceast\u0103 caracteristic\u0103 se nume\u0219te \u00abTemperatur\u0103\u00bb. Exist\u0103 date cerute (hot) care sunt \u00abmai fierbin\u021bi\u00bb dec\u00e2t cele nefolosite. Aceasta se calculeaz\u0103 periodic, de obicei cu un interval de o or\u0103. <\/p>\n<p>Func\u021bia de calcul a temperaturii are urm\u0103toarele caracteristici:<\/p>\n<ul>\n<li>\u00cen lipsa opera\u021biunilor de intrare-ie\u0219ire, datele \u00abse r\u0103cesc\u00bb \u00een timp.<\/li>\n<li>\u00cen condi\u021bii de \u00eenc\u0103rcare relativ constant\u0103, temperatura cre\u0219te ini\u021bial \u0219i apoi se stabilizeaz\u0103 \u00eentr-un anumit interval.<\/li>\n<\/ul>\n<p>\nApoi se iau \u00een considerare politicile descrise mai sus \u0219i spa\u021biul liber de pe fiecare tier. Pentru ilustrare, voi aduce o imagine din documenta\u021bie. Aici, blocurile cu temperatur\u0103 mare, medie \u0219i mic\u0103 sunt eviden\u021biate cu culorile ro\u0219u, galben \u0219i albastru, respectiv.<\/p>\n<p><img decoding=\"async\" alt=\"FAST VP \u00een sistemul de stocare Unity: cum func\u021bioneaz\u0103\" src=\"\/wp-content\/uploads\/2020\/03\/4815ae20d2e33a8f7f47279da0965ae0.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nDar s\u0103 ne \u00eentoarcem la sarcini. A\u0219adar, putem \u00eencepe analiza a ceea ce se face pentru a rezolva sarcinile FAST VP.<\/p>\n<h4>A. Distribu\u021bia datelor pe diferite tipuri de discuri, niveluri<\/h4>\n<p>\nAceasta este, de fapt, sarcina principal\u0103 a FAST VP. Celelalte, \u00eentr-un anumit sens, deriv\u0103 din aceasta. \u00cen func\u021bie de politica aleas\u0103, datele vor fi distribuite pe diferite niveluri de stocare. \u00cen primul r\u00e2nd, se ia \u00een considerare politica de plasare, apoi temperatura blocurilor \u0219i dimensiunea\/viteza grupurilor RAID. <\/p>\n<p>Pentru politicile Highest\/Lowest Available Tier, totul este suficient de simplu. \u00cen cazul celorlalte dou\u0103, lucrurile stau astfel. Pe diferite niveluri, datele sunt distribuite av\u00e2nd \u00een vedere dimensiunea \u0219i performan\u021ba grupurilor RAID: astfel \u00eenc\u00e2t raportul dintre \u00abtemperatura\u00bb total\u0103 a blocurilor \u0219i \u00abperforman\u021ba maxim\u0103\u00bb teoretic\u0103 a fiec\u0103rui grup RAID s\u0103 fie aproximativ acela\u0219i. Astfel, sarcina este distribuit\u0103 mai mult sau mai pu\u021bin uniform. Datele mai cerute sunt mutate pe suporturi rapide, iar cele utilizate rar \u2013 pe suporturi mai lente. \u00cen ideal, distribu\u021bia ar trebui s\u0103 arate aproximativ astfel: <\/p>\n<p><img decoding=\"async\" alt=\"FAST VP \u00een sistemul de stocare Unity: cum func\u021bioneaz\u0103\" src=\"\/wp-content\/uploads\/2020\/03\/08ecbdc3dbf0409ba67eaf51eed24745.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<h4>B. Distribu\u021bia datelor \u00eentre discuri de acela\u0219i tip<\/h4>\n<p>\nRe\u021bine\u021bi, la \u00eenceput am spus c\u0103 suporturile de informa\u021bie din <b>una sau mai multe<\/b> C\u00e2te niveluri se combin\u0103 \u00eentr-un singur pool? \u00cen cazul unui singur nivel pentru FAST VP, exist\u0103 \u0219i munc\u0103. Pentru a maximiza performan\u021ba oric\u0103rui nivel, este de preferat s\u0103 se distribueze datele uniform \u00eentre cele trei unit\u0103\u021bi. Aceasta va permite (\u00een teorie) ob\u021binerea celui mai mare num\u0103r de IOPS. Datele din interiorul grupului RAID pot fi considerate distribuite uniform pe discuri, dar \u00eentre grupurile RAID acest lucru nu este \u00eentotdeauna a\u0219a. \u00cen cazul unui dezechilibru, FAST VP va muta datele \u00eentre grupurile RAID propor\u021bional cu volumul \u0219i \u201eperforman\u021ba condi\u021bionat\u0103\u201d (\u00een termeni numerici). Pentru a ilustra, voi prezenta un grafic de reechilibrare \u00eentre trei grupuri RAID:<\/p>\n<p><img decoding=\"async\" alt=\"FAST VP \u00een sistemul de stocare Unity: cum func\u021bioneaz\u0103\" src=\"\/wp-content\/uploads\/2020\/03\/df92c278bbc9138beb109de0c05db705.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<h4>B. Distribu\u021bia datelor la extinderea pool-ului<\/h4>\n<p>\nAceast\u0103 sarcin\u0103 este un caz particular al celei anterioare \u0219i se efectueaz\u0103 atunci c\u00e2nd se adaug\u0103 un grup RAID \u00een pool. Pentru ca grupul RAID proasp\u0103t ad\u0103ugat s\u0103 nu r\u0103m\u00e2n\u0103 neutilizat, o parte din date va fi mutat\u0103 pe acesta, ceea ce va redistribui \u0219i carga \u00eentre toate grupurile RAID.<\/p>\n<h2>Uniformizarea uzurii SSD<\/h2>\n<p>\nPrin intermediul uniformiz\u0103rii uzurii, FAST VP poate prelungi durata de via\u021b\u0103 a SSD-urilor, de\u0219i aceast\u0103 func\u021bie nu se leag\u0103 direct de Storage Tiering. Deoarece deja exist\u0103 date despre temperatur\u0103, num\u0103rul de opera\u021biuni de scriere este de asemenea luat \u00een considerare, iar noi \u0219tim s\u0103 mut\u0103m blocurile de date, ar fi logic ca FAST VP s\u0103 rezolve \u0219i aceast\u0103 sarcin\u0103.<\/p>\n<p>\u00cen cazul \u00een care num\u0103rul de scrieri pe un grup RAID dep\u0103\u0219e\u0219te semnificativ num\u0103rul de scrieri pe altul, FAST VP va redistribui datele \u00een conformitate cu num\u0103rul de opera\u021biuni de scriere. Pe de o parte, aceasta reduce sarcina \u0219i conserveaz\u0103 resursele anumitor discuri, pe de alt\u0103 parte, adaug\u0103 \u201emunc\u0103\u201d pentru cele mai pu\u021bin \u00eenc\u0103rcate, cresc\u00e2nd performan\u021ba general\u0103.<\/p>\n<p>Astfel, FAST VP \u00ee\u0219i asum\u0103 sarcinile tradi\u021bionale ale Storage Tiering \u0219i face \u0219i pu\u021bin mai mult dec\u00e2t at\u00e2t. Toate acestea permit stocarea eficient\u0103 a datelor \u00een familia de produse Unity.<\/p>\n<h2>C\u00e2teva sfaturi<\/h2>\n<p><\/p>\n<ol>\n<li>Nu neglija\u021bi citirea documenta\u021biei. Exist\u0103 cele mai bune practici \u0219i acestea func\u021bioneaz\u0103 destul de bine. Dac\u0103 sunt respectate, \u00een general, nu apar probleme serioase. Celelalte sfaturi repet\u0103 sau completeaz\u0103 \u00een mare parte aceste practici.<\/li>\n<li>Dac\u0103 a\u021bi configurat \u0219i activat FAST VP, este mai bine s\u0103-l l\u0103sa\u021bi activat. S\u0103 permit\u0103 distribuirea datelor \u00een intervalul de timp alocat, pas cu pas, dec\u00e2t odat\u0103 pe an, influen\u021b\u00e2nd grav performan\u021ba altor sarcini. \u00cen astfel de cazuri, redistribuirea datelor poate dura mult timp.<\/li>\n<li>Acorda\u021bi o aten\u021bie deosebit\u0103 alegerii feronierului de relocare. De\u0219i pare evident, \u00eencerca\u021bi s\u0103 alege\u021bi un moment cu cea mai mic\u0103 \u00eenc\u0103rcare pe Unity \u0219i s\u0103 aloca\u021bi un interval de timp suficient.<\/li>\n<li>Planifica\u021bi extinderea SYST, face\u021bi acest lucru la timp. Este o recomandare general\u0103, care este important\u0103 \u0219i pentru FAST VP. Dac\u0103 volumul de spa\u021biu liber este foarte mic, atunci \u0219i mutarea datelor va fi \u00eencetinit\u0103 sau va deveni imposibil\u0103. Mai ales dac\u0103 a\u021bi neglijat punctul 2.<\/li>\n<li>C\u00e2nd extinde\u021bi pool-ul cu FAST VP activat, nu trebuie s\u0103 \u00eencepe\u021bi cu cele mai lente discuri. Adic\u0103 fie ad\u0103uga\u021bi toate grupurile RAID planificate deodat\u0103, fie ad\u0103uga\u021bi mai \u00eent\u00e2i cele mai rapide discuri. \u00cen acest caz, redistribuirea datelor pe noile discuri \"rapide\" va cre\u0219te viteza general\u0103 a pool-ului. \u00cen caz contrar, \u00eencep\u00e2nd cu discurile \"lente\", s-ar putea s\u0103 ave\u021bi o situa\u021bie foarte nepl\u0103cut\u0103. Mai \u00eent\u00e2i, se va realiza transferul datelor pe noile discuri, relativ lente, iar apoi, \u00een momentul ad\u0103ug\u0103rii discurilor mai rapide, \u00een direc\u021bia invers\u0103. Aici sunt nuan\u021be legate de diferitele politici FAST VP, dar \u00een general, o astfel de situa\u021bie este posibil\u0103.<\/li>\n<\/ol>\n<p>\nDac\u0103 sunte\u021bi interesat de acest produs, pute\u021bi \u00eencerca gratuit Unity \u00een ac\u021biune, desc\u0103rc\u00e2nd Unity VSA virtual appliance.<\/p>\n<p><img decoding=\"async\" alt=\"FAST VP \u00een sistemul de stocare Unity: cum func\u021bioneaz\u0103\" src=\"\/wp-content\/uploads\/2020\/03\/a6ce6116c4ba028b14447157a270e5d2.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n\u00cen \u00eencheierea materialului, \u00eemp\u0103rt\u0103\u0219esc c\u00e2teva link-uri utile:<\/p>\n<ul>\n<li>Pagina <noindex><a rel=\"nofollow\" href=\"https:\/\/www.delltechnologies.com\/ru-ru\/storage\/unity.htm\">SYST Unity<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/community.emc.com\/docs\/DOC-70939\">Dell EMC Unity: FAST VP Teoria Oper\u0103rii<\/a><\/noindex> \u2013 descriere scurt\u0103 a func\u021biei<\/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\">O descriere mai complet\u0103 \u0219i detaliat\u0103<\/a><\/noindex>, format 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> Concluzie <\/h2>\n<p>\nA\u0219 dori s\u0103 scriu multe, dar \u00een\u021beleg c\u0103 nu toate detaliile vor fi interesante pentru cititor. De exemplu, a\u0219 putea discuta mai pe larg despre criteriile pe baza c\u0103rora FAST VP ia decizii cu privire la transferul de date, despre procesele de analiz\u0103 a statisticilor de input-output. De asemenea, nu am abordat deloc tema interac\u021biunii cu <noindex><a rel=\"nofollow\" href=\"https:\/\/www.dellemc.com\/resources\/en-us\/asset\/white-papers\/products\/storage\/h16289-dell_emc_unity-dynamic_pools.pdf\">Dynamic Pools<\/a><\/noindex>, iar acest lucru ar necesita un articol separat. Putem chiar s\u0103 ne imagin\u0103m despre dezvoltarea acestei tehnologii. Sper c\u0103 nu a fost plictisitor \u0219i c\u0103 nu v-am obosit. P\u00e2n\u0103 data viitoare!<br \/>\n<br \/>Sursa: <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 5.0.2 - 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