{"id":610,"date":"2018-11-27T21:57:57","date_gmt":"2018-11-27T20:57:57","guid":{"rendered":"https:\/\/virtualguru.cz\/?p=610"},"modified":"2018-11-27T22:24:12","modified_gmt":"2018-11-27T21:24:12","slug":"vsan-cast-1-co-to-je-a-proc-ji-chtit","status":"publish","type":"post","link":"https:\/\/virtualguru.cz\/en\/2018\/11\/27\/vsan-cast-1-co-to-je-a-proc-ji-chtit\/","title":{"rendered":"vSAN \u2013 \u010d\u00e1st 1: co to je a pro\u010d j\u00ed cht\u00edt?"},"content":{"rendered":"

Co je\u00a0<\/b>vSAN<\/b>?<\/b> \u00a0<\/span><\/p>\n

VMware vSAN je technologie, kter\u00e1 poskytuje \u0161k\u00e1lovateln\u00e9, vysoce v\u00fdkonn\u00e9 datov\u00e9 \u00falo\u017ei\u0161t\u011b na softwarov\u00e9 b\u00e1zi. \u010casto v t\u00e9to souvislosti najdete tak\u00e9 term\u00edny \u201cSDS\u201d nebo \u201cHCI\u201d.\u00a0<\/span><\/p>\n

Co <\/b>j<\/b>e SDS?<\/b>\u00a0<\/span><\/p>\n

Software defined storage (SDS) je l\u00edbiv\u00fd marketingov\u00fd n\u00e1zev, kter\u00fdm se dnes ozna\u010duj\u00ed v\u0161echny storage produkty prim\u00e1rn\u011b zalo\u017een\u00e9 na softwarov\u00e9 vrstv\u011b. Neboli software, kter\u00fd je instalov\u00e1n na komoditn\u00ed x86 servery a zprost\u0159edkov\u00e1v\u00e1 datovou a management vrstvu fyzick\u00fdch disk\u016f v takov\u00e9mto serveru. \u00a0<\/span><\/p>\n

Co je HCI?<\/b>\u00a0<\/span><\/p>\n

Hyperconverged Infrastructure (HCI), jedn\u00e1 se o infrastrukturu kombinuj\u00edc\u00ed z\u00e1kladn\u00ed stavebn\u00ed bloky, v\u00fdpo\u010detn\u00ed v\u00fdkon (CPU), opera\u010dn\u00ed pam\u011b\u0165 (RAM) a \u00falo\u017en\u00fd prostor (HDD\/SSD). Jak\u00fd je ale rozd\u00edl oproti klasick\u00e9mu fyzick\u00e9mu serveru, kter\u00fd toto obsahuje tak\u00e9? Z\u00e1kladem HCI je krom\u011b komoditn\u00edho x86 serveru tak\u00e9 virtualiza\u010dn\u00ed engine, do kter\u00e9ho jsou implementov\u00e1ny ostatn\u00ed \u010d\u00e1sti poskytuj\u00edc\u00ed softwarovou storage (SDS) a\u00a0softwarov\u00fd networking (SDN). V\u0161e je tak spojeno do jednotn\u00e9ho syst\u00e9mu, kter\u00fd m\u00e1 jednotn\u00fd management. Nezbytnou vlastnost\u00ed takov\u00e9ho syst\u00e9mu je tak\u00e9 \u0161k\u00e1lovatelnost a vysok\u00e1 dostupnost.\u00a0<\/span><\/p>\n

Softwarov\u00e9 vs. Hardwarov\u00e9 diskov\u00e9 pole<\/b>?<\/b>\u00a0<\/span><\/p>\n

Diskov\u00e9 pole v podob\u011b dedikovan\u00e9ho hardwaru je to, na co jsme zvykl\u00ed. V\u00edme, \u017ee je to \u201cjedno\u00fa\u010delov\u00e9\u201d za\u0159\u00edzen\u00ed s jednozna\u010dn\u011b definovan\u00fdm v\u00fdkonem a uzav\u0159en\u00fdm opera\u010dn\u00edm syst\u00e9mem. N\u011bjak mu\u00a0za ta l\u00e9ta d\u016fv\u011b\u0159ujeme, proto\u017ee n\u00e1s m\u00e1lokdy opravdu zklamalo. \u00a0<\/span><\/p>\n

Proti tomu m\u00e1me softwarovou vrstvu, kter\u00e9 z n\u011bjak\u00e9ho d\u016fvodu d\u016fv\u011b\u0159ujeme m\u00e9n\u011b. Nov\u00e9 marketingov\u00e9 n\u00e1zvy na n\u00e1s chrl\u00ed v\u00fdrobci ka\u017edou chv\u00edli a p\u0159itom se nejedn\u00e1 o nic nov\u00e9ho. Softwarov\u00e9 storage jako Openfiler prvn\u00ed vyd\u00e1n\u00ed v roce 2004, FreeNAS prvn\u00ed vyd\u00e1n\u00ed 2005, NexentaStor prvn\u00ed vyd\u00e1n\u00ed 2008, maj\u00ed za sebou v\u00edce ne\u017e 10 let v\u00fdvoje. Um\u00edte si vzpomenout, jak dlouho jsou s n\u00e1mi softwarov\u00e9 RAIDy? A pou\u017e\u00edvaj\u00ed se dodnes. \u00a0<\/span><\/p>\n

Tohle byly p\u0159\u00edklady z opensource sv\u011bta a co enterprise? Vzpome\u0148me nap\u0159\u00edklad Lefthand Networks. Ji\u017e v roce 2001 p\u0159i\u0161li s nez\u00e1visl\u00fdm storage enginem, kter\u00fd umo\u017e\u0148oval takzvan\u00fd \u201cnetwork RAID\u201d a diskov\u00fd prostor byl prezentov\u00e1n po iSCSI. A\u017e pot\u00e9, co HP Lefthand v roce 2008 koupilo, jej uzav\u0159elo na sv\u00e9 servery. St\u00e1le se ale jednalo o softwarovou storage. Kdy\u017e pak p\u0159i\u0161lo kr\u00e1sn\u00e9 ozna\u010den\u00ed SDS, tak produkt op\u011bt vzali a umo\u017enili jeho instalaci do virtu\u00e1ln\u00edho sv\u011bta (zjednodu\u0161en\u011b \u0159e\u010deno). Pro\u010d se tedy softwarov\u00fdch diskov\u00fdch pol\u00ed ob\u00e1vat? Maj\u00ed za sebou ji\u017e dlouhou \u0159adu let a jsou mnoh\u00fdmi z n\u00e1s otestov\u00e1ny. To, co n\u00e1s brzd\u00ed, nen\u00ed technologie, ta dnes v mnoh\u00e9m p\u0159ekon\u00e1v\u00e1 klasick\u00e9 \u201cblack box\u201d diskov\u00e9 syst\u00e9my. Pr\u00e1v\u011b kv\u016fli na\u0161\u00ed ned\u016fv\u011b\u0159e je v\u00fdvoji t\u011bchto produkt\u016f v\u011bnov\u00e1na i v\u011bt\u0161\u00ed pe\u010dlivost. Tyto syst\u00e9my, pokud jsou vyv\u00edjeny nativn\u011b pro virtulizovan\u00e9 prost\u0159ed\u00ed (stejn\u011b jako vSAN), jsou opro\u0161t\u011bny od mnoh\u00fdch limit\u016f, kter\u00e9 fyzick\u00fd sv\u011bt m\u011bl a maj\u00ed v sob\u011b implementov\u00e1no mnoho samoopravn\u00fdch mechanizm\u016f, o kter\u00fdch se klasick\u00fdm diskov\u00fdm pol\u00edm ani nezd\u00e1.\u00a0<\/span><\/p>\n

Nen\u00ed tedy \u010das zm\u011bnit n\u00e1zor?<\/b>\u00a0<\/span><\/p>\n

VMware vSAN, jak jsem ji\u017e \u0159ekl, je od z\u00e1kladu nativn\u011b vyv\u00edjena pro virtualizovan\u00e9 prost\u0159ed\u00ed. Jej\u00ed prvn\u00ed verze spat\u0159ila sv\u011btlo sv\u011bta v roce 2013. Jej\u00ed obrovskou p\u0159ednost\u00ed oproti jin\u00fdm produkt\u016fm nasazovan\u00fdm do prost\u0159ed\u00ed VMware je, \u017ee je v j\u00e1d\u0159e samotn\u00e9ho hypervizoru. Nen\u00ed tak nutno implementovat \u017e\u00e1dn\u00e1 dal\u0161\u00ed \u201cVM\u201d. V p\u0159\u00edpad\u011b All Flash konfigurace m\u00e1 tak masivn\u00ed, distribuovan\u00fd v\u00fdkon, kter\u00e9mu jen t\u011b\u017eko monolitick\u00e1 diskov\u00e1 pole konkuruj\u00ed. V neposledn\u00ed \u0159ad\u011b pak dal\u0161\u00ed obrovskou v\u00fdhodou je vysok\u00e1 \u0161k\u00e1lovatelnost. Cel\u00fd syst\u00e9m pak jednodu\u0161e a za b\u011bhu lze roz\u0161i\u0159ovat a t\u00edm navy\u0161ovat jeho v\u00fdkon i kapacitu.\u00a0<\/span><\/p>","protected":false},"excerpt":{"rendered":"

Co je\u00a0vSAN? \u00a0 VMware vSAN je technologie, kter\u00e1 poskytuje \u0161k\u00e1lovateln\u00e9, vysoce v\u00fdkonn\u00e9 datov\u00e9 \u00falo\u017ei\u0161t\u011b na softwarov\u00e9 b\u00e1zi. \u010casto v t\u00e9to souvislosti najdete tak\u00e9 term\u00edny \u201cSDS\u201d…<\/p>\n

Continue ReadingvSAN \u2013 \u010d\u00e1st 1: co to je a pro\u010d j\u00ed cht\u00edt?<\/span> <\/i><\/a><\/div>","protected":false},"author":3,"featured_media":619,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"iawp_total_views":189,"footnotes":""},"categories":[5],"tags":[13],"class_list":["post-610","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-vsan","tag-vsan","entry"],"_links":{"self":[{"href":"https:\/\/virtualguru.cz\/en\/wp-json\/wp\/v2\/posts\/610","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/virtualguru.cz\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/virtualguru.cz\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/virtualguru.cz\/en\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/virtualguru.cz\/en\/wp-json\/wp\/v2\/comments?post=610"}],"version-history":[{"count":5,"href":"https:\/\/virtualguru.cz\/en\/wp-json\/wp\/v2\/posts\/610\/revisions"}],"predecessor-version":[{"id":618,"href":"https:\/\/virtualguru.cz\/en\/wp-json\/wp\/v2\/posts\/610\/revisions\/618"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/virtualguru.cz\/en\/wp-json\/wp\/v2\/media\/619"}],"wp:attachment":[{"href":"https:\/\/virtualguru.cz\/en\/wp-json\/wp\/v2\/media?parent=610"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/virtualguru.cz\/en\/wp-json\/wp\/v2\/categories?post=610"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/virtualguru.cz\/en\/wp-json\/wp\/v2\/tags?post=610"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}