{"id":31305,"date":"2019-10-31T21:40:34","date_gmt":"2019-10-31T18:40:34","guid":{"rendered":"https:\/\/prohoster.info\/blog\/realizatsiya-ssd-keshirovaniya-v-shd-qsan-xcubesan\/"},"modified":"2019-10-31T21:40:34","modified_gmt":"2019-10-31T18:40:34","slug":"realizatsiya-ssd-keshirovaniya-v-shd-qsan-xcubesan","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sk\/blog\/administrirovanie\/realizatsiya-ssd-keshirovaniya-v-shd-qsan-xcubesan","title":{"rendered":"Implement\u00e1cia SSD caching v STH QSAN XCubeSAN","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Technol\u00f3gie zvy\u0161ovania v\u00fdkonu zalo\u017een\u00e9 na vyu\u017e\u00edvan\u00ed SSD, ktor\u00e9 sa be\u017ene aplikuj\u00fa v \u00falo\u017en\u00fdch syst\u00e9moch, boli d\u00e1vno vyn\u00e1jden\u00e9. Predov\u0161etk\u00fdm ide o pou\u017eitie SSD ako priestoru na ukladanie, \u010do je 100% efekt\u00edvne, ale aj n\u00e1kladn\u00e9. Preto sa vyu\u017e\u00edvaj\u00fa technol\u00f3gie tieringu a caching, kde sa SSD pou\u017e\u00edvaj\u00fa iba pre najvyh\u013ead\u00e1vanej\u0161ie (\u201ehor\u00face\u201c) d\u00e1ta. Tiering je vhodn\u00fd pre scen\u00e1re dlhodob\u00e9ho (dni-t\u00fd\u017edne) pou\u017e\u00edvania \u201ehor\u00facich\u201c d\u00e1t. A caching, naopak, pre kr\u00e1tkodob\u00e9 (min\u00faty-hodiny) pou\u017e\u00edvanie. Obe tieto mo\u017enosti s\u00fa implementovan\u00e9 v \u00falo\u017en\u00fdch syst\u00e9moch. <noindex><a rel=\"nofollow\" href=\"http:\/\/www.qsan.su\/goods\/sistemyi-xraneniya-dannyix\/\">QSAN XCubeSAN<\/a><\/noindex>. V tomto \u010dl\u00e1nku sa zameriame na realiz\u00e1ciu druh\u00e9ho algoritmu \u2013 <noindex><a rel=\"nofollow\" href=\"http:\/\/www.qsan.su\/soft\/san-os-4.0\/ssd-keshirovanie-(qcache-2.0).html\">SSD caching<\/a><\/noindex>.<\/p>\n<p>\n<img decoding=\"async\" alt=\"Implement\u00e1cia SSD caching v STH QSAN XCubeSAN\" src=\"\/wp-content\/uploads\/2019\/04\/e2e97119a949509f4a3fe8e17a4238ac.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<p>Podstatou technol\u00f3gie SSD caching je pou\u017eitie SSD ako medzi\u010dl\u00e1nku medzi tvrd\u00fdmi diskami a opera\u010dnou pam\u00e4\u0165ou ovl\u00e1da\u010da. V\u00fdkon SSD je samozrejme ni\u017e\u0161\u00ed ako v\u00fdkon vlastnej cache ovl\u00e1da\u010da, no na druhej strane je objem o poriadny kus v\u00e4\u010d\u0161\u00ed. Preto z\u00edskavame ak\u00fdsi kompromis medzi r\u00fdchlos\u0165ou a objemom.<\/p>\n<p><\/p>\n<p><b>Indik\u00e1cie pre pou\u017eitie SSD cache na \u010d\u00edtanie:<\/b><\/p>\n<p><\/p>\n<ul>\n<li>Prevaha oper\u00e1ci\u00ed \u010d\u00edtania nad oper\u00e1ciami z\u00e1pisu (\u010dasto charakteristick\u00e9 pre datab\u00e1zy a webov\u00e9 aplik\u00e1cie);<\/li>\n<li>Existencia \u00fazkeho miesta vo forme v\u00fdkonu po\u013ea tvrd\u00fdch diskov;<\/li>\n<li>Objem vy\u017eadovan\u00fdch d\u00e1t je men\u0161\u00ed ako objem SSD cache.<\/li>\n<\/ul>\n<p><\/p>\n<p>Indik\u00e1cie na pou\u017eitie SSD cache na \u010d\u00edtanie+z\u00e1pis s\u00fa rovnak\u00e9, s v\u00fdnimkou charakteru oper\u00e1ci\u00ed \u2013 zmie\u0161an\u00fd typ (napr\u00edklad s\u00faborov\u00fd server).<\/p>\n<p><\/p>\n<p>V\u00e4\u010d\u0161ina predajcov \u00falo\u017en\u00fdch syst\u00e9mov pou\u017e\u00edva vo svojich produktoch SSD cache len pre oper\u00e1cie \u010d\u00edtania. Z\u00e1sadn\u00fdm rozdielom <noindex><a rel=\"nofollow\" href=\"http:\/\/www.qsan.su\/\">QSAN <\/a><\/noindex>od nich je mo\u017enos\u0165 vyu\u017eitia cache aj pre z\u00e1pis. Na aktiv\u00e1ciu funkcie SSD caching v \u00falo\u017en\u00fdch syst\u00e9moch QSAN je potrebn\u00e9 zak\u00fapi\u0165 samostatn\u00fa licenciu (distribuovan\u00fa v elektronickej forme).<\/p>\n<p><\/p>\n<p>SSD cache in XCubeSAN is physically implemented as separate SSD cache pools. The system can support up to four of them. Each pool uses its own set of SSDs. The properties of the virtual disk allow us to specify whether it will use a cache pool and which one. The enabling and disabling of cache use for volumes can be done online without stopping input\/output. SSDs can also be added to or removed from the pool on-the-fly. When creating an SSD cache pool, it is necessary to choose its operating mode: read-only or read+write. This affects its physical organization. Since there can be multiple cache pools, their functionality can differ (meaning that there can be cache pools for both reading and reading+writing in the system simultaneously).<\/p>\n<p><\/p>\n<p>If the cache pool is used only for reading, it can consist of 1 to 8 SSDs. The disks do not have to be of the same capacity or from the same vendor, as they are combined in an NRAID+ structure. All SSDs in the pool are used collectively. The system actively tries to distribute incoming requests across all SSDs to achieve maximum performance. In case one of the SSDs fails, nothing critical will happen: the cache merely contains a copy of the data stored on the hard disk array. The available SSD cache volume will simply be reduced (or become zero if the initial SSD cache was from a single storage device).<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Implement\u00e1cia SSD caching v STH QSAN XCubeSAN\" src=\"\/wp-content\/uploads\/2019\/04\/1e592445ff41335c844e0a47b2e664c3.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>If the cache is used for read + write operations, the number of SSDs in the pool must be even, as the contents are mirrored across pairs of drives (an NRAID 1+ structure is used). Cache duplication is necessary because it can contain data that has not yet been written to the hard disks. In this case, the failure of an SSD in the cache pool would lead to data loss. However, with NRAID 1+, the failure of an SSD would simply switch the cache to a 'read-only' mode, flushing any unwritten data to the hard disk array. After replacing the faulty SSD, the cache will return to its original operating mode. For added security, a dedicated hot spare can be assigned to the cache operating in read + write mode.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Implement\u00e1cia SSD caching v STH QSAN XCubeSAN\" src=\"\/wp-content\/uploads\/2019\/04\/61c6ba4b29ab31c3ded112b12f8103ce.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>Pri pou\u017eit\u00ed funkcie SSD caching v XCubeSAN existuje nieko\u013eko po\u017eiadaviek na objem pam\u00e4te kontrol\u00e9rov \u00falo\u017en\u00e9ho syst\u00e9mu: \u010d\u00edm viac syst\u00e9movej pam\u00e4te, t\u00fdm v\u00e4\u010d\u0161\u00ed objem cache poolu bude k dispoz\u00edcii.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Implement\u00e1cia SSD caching v STH QSAN XCubeSAN\" src=\"\/wp-content\/uploads\/2019\/04\/40da0dba6094c55adaa54b8d9cbc1bcd.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>Na rozdiel od v\u00e4\u010d\u0161iny v\u00fdrobcov \u00falo\u017en\u00fdch syst\u00e9mov, ktor\u00ed pon\u00fakaj\u00fa len mo\u017enos\u0165 zapn\u00fa\u0165\/vypn\u00fa\u0165 SSD cache, QSAN poskytuje v\u00e4\u010d\u0161ie mo\u017enosti. Konkr\u00e9tne je mo\u017en\u00e9 zvoli\u0165 re\u017eim fungovania cache pod\u013ea charakteru z\u00e1\u0165a\u017ee. Existuj\u00fa tri preddefinovan\u00e9 \u0161abl\u00f3ny, ktor\u00e9 s\u00fa najbli\u017e\u0161ie k pr\u00edslu\u0161n\u00fdm slu\u017eb\u00e1m: datab\u00e1za, s\u00faborov\u00fd syst\u00e9m, webov\u00e1 slu\u017eba. Okrem toho m\u00f4\u017ee administr\u00e1tor vytvori\u0165 vlastn\u00fd profil s po\u017eadovan\u00fdmi hodnotami parametrov: <\/p>\n<p><\/p>\n<ul>\n<li>Ve\u013ekos\u0165 bloku (Cache Block Size) \u2013 1\/2\/4 MB<\/li>\n<li>Po\u010det po\u017eiadaviek na \u010d\u00edtanie bloku, aby bol skop\u00edrovan\u00fd do cache (Populate-on-Read Threshold) \u2013 1..4<\/li>\n<li>Po\u010det po\u017eiadaviek na z\u00e1pis bloku, aby bol skop\u00edrovan\u00fd do cache (Populate-on-Write Threshold) \u2013 0..4<\/li>\n<\/ul>\n<p><img decoding=\"async\" alt=\"Implement\u00e1cia SSD caching v STH QSAN XCubeSAN\" src=\"\/wp-content\/uploads\/2019\/04\/b584e87c4b067ac06a4b78063007f31f.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>Profily je mo\u017en\u00e9 meni\u0165 \u00abna let\u00bb av\u0161ak, samozrejme, s vymazan\u00edm obsahu cache a jeho nov\u00fdm \u00abohriat\u00edm\u00bb.<\/p>\n<p><\/p>\n<p>Pri posudzovan\u00ed princ\u00edpu fungovania SSD cache je mo\u017en\u00e9 vy\u010dleni\u0165 z\u00e1kladn\u00e9 oper\u00e1cie pri pr\u00e1ci s \u0148ou:<\/p>\n<p><\/p>\n<ul>\n<li><noindex><a rel=\"nofollow\" href=\"#1\">\u010c\u00edtanie d\u00e1t, ke\u010f nie s\u00fa dostupn\u00e9 v cache;<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"#2\">\u010c\u00edtanie d\u00e1t, ke\u010f s\u00fa pr\u00edtomn\u00e9 v cache;<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"#3\">Z\u00e1pis d\u00e1t pri pou\u017eit\u00ed cache na \u010d\u00edtanie;<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"#4\">Z\u00e1pis d\u00e1t pri pou\u017eit\u00ed cache na \u010d\u00edtanie + z\u00e1pis.<\/a><\/noindex><\/li>\n<\/ul>\n<p><noindex><a rel=\"nofollow\" name=\"1\"><\/a><\/noindex><\/p>\n<p><img decoding=\"async\" alt=\"Implement\u00e1cia SSD caching v STH QSAN XCubeSAN\" src=\"\/wp-content\/uploads\/2019\/04\/c9f70934f1d9bed5ad60c716bcd3ed30.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><i>\u010c\u00edtanie d\u00e1t, ke\u010f nie s\u00fa dostupn\u00e9 v cache<\/i><\/p>\n<p><\/p>\n<ol>\n<li>Po\u017eiadavka od hostite\u013ea prich\u00e1dza do kontrol\u00e9ra;<\/li>\n<li>Ke\u010f\u017ee po\u017eadovan\u00e9 d\u00e1ta nie s\u00fa v SSD cache, na\u010d\u00edtavaj\u00fa sa z pevn\u00fdch diskov;<\/li>\n<li>Na\u010d\u00edtan\u00e9 d\u00e1ta sa posielaj\u00fa hostite\u013eovi. S\u00fa\u010dasne sa kontroluje, \u010di s\u00fa tieto bloky \u00abhor\u00face\u00bb;<\/li>\n<li>Ak \u00e1no, skop\u00edruj\u00fa sa do SSD cache pre \u010fal\u0161ie pou\u017eitie.<\/li>\n<\/ol>\n<p><noindex><a rel=\"nofollow\" name=\"2\"><\/a><\/noindex><\/p>\n<p><img decoding=\"async\" alt=\"Implement\u00e1cia SSD caching v STH QSAN XCubeSAN\" src=\"\/wp-content\/uploads\/2019\/04\/9eac4b4cf003fb310101b3981dfed177.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><i>\u010c\u00edtanie d\u00e1t, ke\u010f s\u00fa pr\u00edtomn\u00e9 v cache<\/i><\/p>\n<p><\/p>\n<ol>\n<li>Po\u017eiadavka od hostite\u013ea prich\u00e1dza do kontrol\u00e9ra;<\/li>\n<li>Ke\u010f\u017ee po\u017eadovan\u00e9 d\u00e1ta s\u00fa v SSD cache, na\u010d\u00edtavaj\u00fa sa odtia\u013e;<\/li>\n<li>Na\u010d\u00edtan\u00e9 d\u00e1ta sa posielaj\u00fa hostite\u013eovi.<\/li>\n<\/ol>\n<p><noindex><a rel=\"nofollow\" name=\"3\"><\/a><\/noindex><\/p>\n<p><img decoding=\"async\" alt=\"Implement\u00e1cia SSD caching v STH QSAN XCubeSAN\" src=\"\/wp-content\/uploads\/2019\/04\/ae1f52f5882f19916f0b49b0619dae41.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><i>Z\u00e1pis d\u00e1t pri pou\u017eit\u00ed cache na \u010d\u00edtanie <\/i><\/p>\n<p><\/p>\n<ol>\n<li>Po\u017eiadavka na z\u00e1pis od hostite\u013ea prich\u00e1dza do kontrol\u00e9ra;<\/li>\n<li>D\u00e1ta sa zapisuj\u00fa na pevn\u00e9 disky;<\/li>\n<li>Hostite\u013eovi sa vr\u00e1ti odpove\u010f o \u00faspe\u0161nom z\u00e1pise;<\/li>\n<li>S\u00fa\u010dasne sa kontroluje, \u010di je blok \u00abhor\u00faci\u00bb (porovn\u00e1va sa parameter Populate-on-Write Threshold). Ak \u00e1no, skop\u00edruje sa do SSD cache pre n\u00e1sledn\u00e9 pou\u017eitie.<\/li>\n<\/ol>\n<p><noindex><a rel=\"nofollow\" name=\"4\"><\/a><\/noindex><\/p>\n<p><img decoding=\"async\" alt=\"Implement\u00e1cia SSD caching v STH QSAN XCubeSAN\" src=\"\/wp-content\/uploads\/2019\/04\/b69debdc836e3c1d93f64aa8724dd322.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><i>Z\u00e1pis d\u00e1t pri pou\u017eit\u00ed cache na \u010d\u00edtanie+z\u00e1pis<\/i><\/p>\n<p><\/p>\n<ol>\n<li>Po\u017eiadavka na z\u00e1pis od hostite\u013ea prich\u00e1dza do kontrol\u00e9ra;<\/li>\n<li>D\u00e1ta sa zapisuj\u00fa do SSD cache;<\/li>\n<li>Hostite\u013eovi sa vr\u00e1ti odpove\u010f o \u00faspe\u0161nom z\u00e1pise;<\/li>\n<li>\u00dadaje z SSD cache sa na pozad\u00ed zapisuj\u00fa na pevn\u00e9 disky;<\/li>\n<\/ol>\n<h2>Overenie v praxi <\/h2>\n<p>\n<b class=\"spoiler_title\">Testovac\u00ed st\u00e1nok<\/b><\/p>\n<p>2 servery (CPU: 2 x Xeon E5-2620v3 2.4Hz \/ RAM: 32GB) s\u00fa pripojen\u00e9 dvoma portami cez Fibre Channel 16G priamo k SAN XCubeSAN XS5224D (16GB RAM\/ovl\u00e1dac\u00ed jednotka).<\/p>\n<p><\/p>\n<p>Na pole s \u00fadajmi sa pou\u017e\u00edvalo 16 x Seagate Constellation ES, ST500NM0001, 500GB, SAS 6Gb\/s, zapojen\u00fdch v RAID5 (15+1) a 8 x HGST Ultrastar SSD800MH.B, HUSMH8010BSS200, 100GB, SAS 12Gb\/s ako cache.<\/p>\n<p><\/p>\n<p>Boli vytvoren\u00e9 2 zv\u00e4zky: po jednom pre ka\u017ed\u00fd server. <\/p>\n<h3>Test 1. SSD cache iba pre \u010d\u00edtanie s 1-8 SSD<\/h3>\n<p><\/p>\n<p><b>SSD Cache<\/b><\/p>\n<p><\/p>\n<ul>\n<li>I\/O Typ: Prisp\u00f4sobenie<\/li>\n<li>Ve\u013ekos\u0165 bloku cache: 4MB<\/li>\n<li><b>Popul\u00e1cia pri \u010d\u00edtan\u00ed prah: 1<\/b><\/li>\n<li>Popul\u00e1cia pri z\u00e1pise prah: 0<\/li>\n<\/ul>\n<p><b>I\/O Vzor<\/b> <\/p>\n<p><\/p>\n<ul>\n<li>N\u00e1stroj: IOmeter V1.1.0<\/li>\n<li>Pracovn\u00edci: 1<\/li>\n<li>Nevybaven\u00e9 (H\u013abka fronty): 128<\/li>\n<li><b>\u0160pecifik\u00e1cie pr\u00edstupu: 4KB, 100% \u010d\u00edtanie, 100% n\u00e1hodne<\/b><\/li>\n<\/ul>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Implement\u00e1cia SSD caching v STH QSAN XCubeSAN\" src=\"\/wp-content\/uploads\/2019\/04\/6d9f4d3912d066662067fba52eb0e938.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><img decoding=\"async\" alt=\"Implement\u00e1cia SSD caching v STH QSAN XCubeSAN\" src=\"\/wp-content\/uploads\/2019\/04\/665aa2f35d5d78bdb4a128eaea55faf2.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>Teoreticky plat\u00ed, \u017ee \u010d\u00edm viac SSD je v cache poole, t\u00fdm vy\u0161\u0161\u00ed je v\u00fdkon. V praxi sa to aj potvrdilo. Jedin\u00fdm v\u00fdnimo\u010dn\u00fdm pr\u00edpadom je, \u017ee v\u00fdrazn\u00e9 zv\u00fd\u0161enie po\u010dtu SSD pri malom po\u010dte zv\u00e4zkov nevedie k exploz\u00edvnemu efektu. <\/p>\n<p><\/p>\n<h3>Test 2. SSD cache v re\u017eime \u010d\u00edtanie + z\u00e1pis s 2-8 SSD<\/h3>\n<p><\/p>\n<p><b>SSD Cache<\/b><\/p>\n<p><\/p>\n<ul>\n<li> I\/O Typ: Prisp\u00f4sobenie<\/li>\n<li>Ve\u013ekos\u0165 bloku cache: 4MB<\/li>\n<li>Popul\u00e1cia pri \u010d\u00edtan\u00ed prah: 1<\/li>\n<li><b>Popul\u00e1cia pri z\u00e1pise prah: 1 <\/b><\/li>\n<\/ul>\n<p><b>I\/O Vzor<\/b> <\/p>\n<p><\/p>\n<ul>\n<li>N\u00e1stroj: IOmeter V1.1.0<\/li>\n<li>Pracovn\u00edci: 1<\/li>\n<li>Nevybaven\u00e9 (H\u013abka fronty): 128<\/li>\n<li><b>\u0160pecifik\u00e1cie pr\u00edstupu: 4KB, 100% z\u00e1pis, 100% n\u00e1hodne <\/b><\/li>\n<\/ul>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Implement\u00e1cia SSD caching v STH QSAN XCubeSAN\" src=\"\/wp-content\/uploads\/2019\/04\/6177fe7ef2c74045d760ba94598acb34.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><img decoding=\"async\" alt=\"Implement\u00e1cia SSD caching v STH QSAN XCubeSAN\" src=\"\/wp-content\/uploads\/2019\/04\/2e1f749b827d43dd3fa8dcd33243bd9e.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>Rovnak\u00fd v\u00fdsledok: exploz\u00edvny rast v\u00fdkonnosti a \u0161k\u00e1lovanie pri zvy\u0161ovan\u00ed po\u010dtu SSD.<\/p>\n<p><\/p>\n<p>V oboch testoch bol objem pracovn\u00fdch \u00fadajov men\u0161\u00ed ako celkov\u00fd objem cache. Preto sa \u010dasom v\u0161etky bloky skop\u00edrovali do cache. A pr\u00e1ca sa u\u017e v podstate vykon\u00e1vala s SSD, pri\u010dom prakticky nezasahovala do pevn\u00fdch diskov. Cie\u013eom t\u00fdchto testov bolo jasne uk\u00e1za\u0165 efekt\u00edvnos\u0165 prehriatia cache a \u0161k\u00e1lovania jeho v\u00fdkonu v z\u00e1vislosti od po\u010dtu SSD.<\/p>\n<p><\/p>\n<p>Teraz sa vr\u00e1\u0165me z nebies na zem a skontrolujme praktickej\u0161iu situ\u00e1ciu, ke\u010f objem \u00fadajov prevy\u0161uje ve\u013ekos\u0165 cache. Aby test prebehol v rozumnom \u010dase (doba \u00abprehriatia\u00bb cache sa pri zvy\u0161ovan\u00ed ve\u013ekosti zv\u00e4zku v\u00fdrazne zvy\u0161uje), obmedz\u00edme sa na ve\u013ekos\u0165 zv\u00e4zku 120GB. <\/p>\n<p><\/p>\n<h3>Test 3. Emul\u00e1cia fungovania datab\u00e1zy <\/h3>\n<p><\/p>\n<p><b>SSD Cache<\/b><\/p>\n<p><\/p>\n<ul>\n<li> <b>I\/O Typ: Datab\u00e1za<\/b><\/li>\n<li>Ve\u013ekos\u0165 bloku cache: 1MB<\/li>\n<li>Popul\u00e1cia pri \u010d\u00edtan\u00ed prah: 2<\/li>\n<li>Popul\u00e1cia pri z\u00e1pise prah: 1 <\/li>\n<\/ul>\n<p><b>I\/O Vzor<\/b> <\/p>\n<p><\/p>\n<ul>\n<li>N\u00e1stroj: IOmeter V1.1.0<\/li>\n<li>Pracovn\u00edci: 1<\/li>\n<li>Nevybaven\u00e9 (H\u013abka fronty): 128<\/li>\n<li><b>\u0160pecifik\u00e1cie pr\u00edstupu: 8KB, 67% \u010d\u00edtanie, 100% n\u00e1hodne<\/b><\/li>\n<\/ul>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Implement\u00e1cia SSD caching v STH QSAN XCubeSAN\" src=\"\/wp-content\/uploads\/2019\/04\/949b9fc604cf3a932ebf308d19fc9ff1.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<h2>Verdikt <\/h2>\n<p><\/p>\n<blockquote><p>Ako zrejm\u00fd z\u00e1ver sa pon\u00faka dobr\u00e1 efekt\u00edvnos\u0165 vyu\u017eitia SSD cache na zv\u00fd\u0161enie v\u00fdkonu akejko\u013evek SAN. Pou\u017eite na <noindex><a rel=\"nofollow\" href=\"http:\/\/www.qsan.su\/goods\/sistemyi-xraneniya-dannyix\/\">QSAN XCubeSAN<\/a><\/noindex> Toto vyhl\u00e1senie plat\u00ed v plnej miere: funkcia SSD cache je realizovan\u00e1 vynikaj\u00faco. To sa t\u00fdka podpory re\u017eimov \u010d\u00edtania a \u010d\u00edtania + z\u00e1pisu, flexibiln\u00e9ho nastavenia pre ak\u00e9ko\u013evek sc\u00e9n\u00e1\u0159e vyu\u017eitia a kone\u010dnej v\u00fdkonnosti syst\u00e9mu ako celku. Preto za ve\u013emi rozumn\u00fa cenu (cena licencie je porovnate\u013en\u00e1 s cenou 1-2 SSD) mo\u017eno v\u00fdrazne zv\u00fd\u0161i\u0165 celkov\u00fa v\u00fdkonnos\u0165.<\/p><\/blockquote>\n<p>Zdroj: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/skilline\/blog\/432366\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0422\u0435\u0445\u043d\u043e\u043b\u043e\u0433\u0438\u0438 \u043f\u043e\u0432\u044b\u0448\u0435\u043d\u0438\u044f \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u0438, \u043e\u0441\u043d\u043e\u0432\u0430\u043d\u043d\u044b\u0435 \u043d\u0430 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0438 SSD \u0438 \u0448\u0438\u0440\u043e\u043a\u043e \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u043c\u044b\u0435 \u0432 \u0421\u0425\u0414, \u0443\u0436\u0435 \u0434\u0430\u0432\u043d\u043e \u0438\u0437\u043e\u0431\u0440\u0435\u0442\u0435\u043d\u044b. \u041f\u0440\u0435\u0436\u0434\u0435 \u0432\u0441\u0435\u0433\u043e \u2013 \u044d\u0442\u043e \u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0438\u0435 SSD \u0432 \u043a\u0430\u0447\u0435\u0441\u0442\u0432\u0435 \u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u0441\u0442\u0432\u0430 \u0445\u0440\u0430\u043d\u0435\u043d\u0438\u044f, \u0447\u0442\u043e \u043d\u0430 100% \u044d\u0444\u0444\u0435\u043a\u0442\u0438\u0432\u043d\u043e, \u043d\u043e \u0434\u043e\u0440\u043e\u0433\u043e. \u041f\u043e\u044d\u0442\u043e\u043c\u0443 \u0432 \u0445\u043e\u0434 \u0438\u0434\u0443\u0442 \u0442\u0435\u0445\u043d\u043e\u043b\u043e\u0433\u0438\u0438 \u0442\u0438\u0440\u0438\u043d\u0433\u0430 \u0438 \u043a\u044d\u0448\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f, \u0433\u0434\u0435 SSD \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044e\u0442\u0441\u044f \u0442\u043e\u043b\u044c\u043a\u043e \u0434\u043b\u044f \u043d\u0430\u0438\u0431\u043e\u043b\u0435\u0435 \u0432\u043e\u0441\u0442\u0440\u0435\u0431\u043e\u0432\u0430\u043d\u043d\u044b\u0445 (\u00ab\u0433\u043e\u0440\u044f\u0447\u0438\u0445\u00bb) \u0434\u0430\u043d\u043d\u044b\u0445. \u0422\u0438\u0440\u0438\u043d\u0433 \u0445\u043e\u0440\u043e\u0448 \u0434\u043b\u044f \u0441\u0446\u0435\u043d\u0430\u0440\u0438\u0435\u0432 \u0434\u043e\u043b\u0433\u043e\u0432\u0440\u0435\u043c\u0435\u043d\u043d\u043e\u0433\u043e (\u0434\u043d\u0438-\u043d\u0435\u0434\u0435\u043b\u0438) \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u044f 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