{"id":113018,"date":"2024-01-20T23:28:04","date_gmt":"2024-01-20T21:28:06","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/opyt-sozdaniya-hranilishha-ceph-c-propusknoj-sposobnostyu-tebibajt-v-sekundu"},"modified":"2024-01-20T23:28:04","modified_gmt":"2024-01-20T21:28:06","slug":"opyt-sozdaniya-hranilishha-ceph-c-propusknoj-sposobnostyu-tebibajt-v-sekundu","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/opyt-sozdaniya-hranilishha-ceph-c-propusknoj-sposobnostyu-tebibajt-v-sekundu","title":{"rendered":"Esperienza nella creazione di uno storage Ceph con una larghezza di banda di tebibyte al secondo","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Un ingegnere della Clyso ha riassunto l'esperienza nella creazione di un cluster di storage basato su un sistema distribuito fault-tolerant Ceph, con una capacit\u00e0 superiore a un tebibyte al secondo. Si nota che questo \u00e8 il primo cluster basato su Ceph in grado di raggiungere un simile risultato, ma per ottenere questa performance, gli ingegneri hanno dovuto superare diverse insidie non evidenti.    <\/p>\n<p>Ad esempio, per aumentare le prestazioni del 10-20%, \u00e8 stato sufficiente attivare nel BIOS dei server la modalit\u00e0 di massima performance e disattivare il c-state (il c-state modifica i parametri di risparmio energetico in base al carico, influenzando Ceph). Si \u00e8 anche scoperto che, utilizzando le unit\u00e0 NVMe, il kernel Linux spende molto tempo a gestire i blocchi di spin durante l'aggiornamento della mappatura IOMMU. Disattivare l'IOMMU nel kernel ha portato a un notevole incremento delle prestazioni nei test di lettura e scrittura dei blocchi di dimensione 4MB.     <\/p>\n<p>Tuttavia, disabilitare IOMMU non ha risolto il problema della diminuzione delle prestazioni durante la scrittura casuale di blocchi da 4KB. Investigando la questione, gli ingegneri hanno scoperto delle correzioni negli script di costruzione di Ceph dai progetti Gentoo e Ubuntu, che includevano la compilazione con l'opzione RelWithDebInfo; infatti, con essa, GCC applicava la modalit\u00e0 di ottimizzazione \u00ab-O2\u00bb, che aumentava notevolmente le prestazioni di Ceph. Anche la compilazione con la libreria TCMalloc contribuiva alla riduzione delle prestazioni. Cambiando i flag di compilazione e interrompendo l'uso di TCMalloc, si \u00e8 ridotto il tempo di compattazione di tre volte e migliorate le prestazioni delle operazioni di scrittura casuale con blocchi da 4KB di due volte. Infine, sono state ulteriormente ottimizzate le impostazioni di Reef RocksDB e i gruppi di allocazione (PG).      <\/p>\n<p>Il cluster \u00e8 stato formato da 68 nodi basati su <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/it\/server\/\"   title=\"server\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"1540\">server<\/a> Dell PowerEdge R6615 con CPU AMD EPYC 9454P 48C\/96T. Ogni nodo contiene 10 unit\u00e0 NVMe Dell da 15.36TB, due adattatori Ethernet 100GbE Mellanox ConnectX-6 e 192 GB di RAM. Il software \u00e8 basato su Ubuntu 20.04.6 e Ceph 17.2.7. Nel cluster, su 63 nodi, sono stati attivati 630 OSD (Object Storage Daemon, processo in background che gestisce lo storage dei dati nel locale, uno OSD per ogni unit\u00e0 NVMe), tre processi MON (monitor, che tiene traccia dello stato del cluster) e un processo MGR (Manager, servizio di gestione). La capacit\u00e0 di storage \u00e8 di 8.2 PB.      <\/p>\n<p>La capacit\u00e0 di banda nelle operazioni di lettura sequenziale di blocchi da 4M \u00e8 stata di 1025 GiB\/s, mentre per la scrittura \u00e8 stata di 270 GiB\/s. Durante la lettura casuale di blocchi da 4KB, le prestazioni sono state di 25,5 milioni di operazioni di lettura al secondo e 4,9 milioni per la scrittura. L'attivazione della crittografia ha ridotto la capacit\u00e0 di banda in lettura a circa 750 GiB\/s. Utilizzando i codici di correzione degli errori EC62, la capacit\u00e0 di banda \u00e8 stata di 547 GiB\/s in lettura e 387 GiB\/s in scrittura (la velocit\u00e0 di scrittura \u00e8 risultata superiore rispetto a senza codici di correzione), e in accesso casuale si sono registrati 3,4M IOPS in lettura e 936K IOPS in scrittura.  <center><img decoding=\"async\" alt=\"Esperienza nella creazione di uno storage Ceph con una larghezza di banda di tebibyte al secondo\" src=\"\/wp-content\/uploads\/2024\/01\/515f3525e2194d8d91e3c582ff525cbb.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>  <center><img decoding=\"async\" alt=\"Esperienza nella creazione di uno storage Ceph con una larghezza di banda di tebibyte al secondo\" src=\"\/wp-content\/uploads\/2024\/01\/1adbb4ede16cf979a79f04468c52895c.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>        <\/p>\n<p>In aggiunta, si pu\u00f2 notare che nel settembre precedente \u00e8 stato raggiunto un traguardo simile in termini di capacit\u00e0 nel cluster di storage exabyte del CERN, realizzato con un sistema di storage distribuito open source EOS, basato sul protocollo XRootD.<br \/>\n<br \/>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=60470\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0418\u043d\u0436\u0435\u043d\u0435\u0440 \u0438\u0437 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438 Clyso \u043e\u0431\u043e\u0431\u0449\u0438\u043b \u043e\u043f\u044b\u0442 \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u044f \u043a\u043b\u0430\u0441\u0442\u0435\u0440\u0430 \u0445\u0440\u0430\u043d\u0435\u043d\u0438\u044f \u043d\u0430 \u0431\u0430\u0437\u0435 \u043e\u0442\u043a\u0430\u0437\u043e\u0443\u0441\u0442\u043e\u0439\u0447\u0438\u0432\u043e\u0439 \u0440\u0430\u0441\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b Ceph \u0441 \u043f\u0440\u043e\u043f\u0443\u0441\u043a\u043d\u043e\u0439 \u0441\u043f\u043e\u0441\u043e\u0431\u043d\u043e\u0441\u0442\u044c\u044e, \u043f\u0440\u0435\u0432\u044b\u0448\u0430\u044e\u0449\u0435\u0439 \u0442\u0435\u0431\u0438\u0431\u0430\u0439\u0442 \u0432 \u0441\u0435\u043a\u0443\u043d\u0434\u0443. \u041e\u0442\u043c\u0435\u0447\u0430\u0435\u0442\u0441\u044f, \u0447\u0442\u043e \u044d\u0442\u043e \u043f\u0435\u0440\u0432\u044b\u0439 \u043a\u043b\u0430\u0441\u0442\u0435\u0440 \u043d\u0430 \u0431\u0430\u0437\u0435 Ceph, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u0441\u043c\u043e\u0433 \u0434\u043e\u0441\u0442\u0438\u0433\u043d\u0443\u0442\u044c \u043f\u043e\u0434\u043e\u0431\u043d\u043e\u0433\u043e \u043f\u043e\u043a\u0430\u0437\u0430\u0442\u0435\u043b\u044f, \u043d\u043e \u043f\u0435\u0440\u0435\u0434 \u043f\u043e\u043b\u0443\u0447\u0435\u043d\u0438\u0435\u043c \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u043d\u043e\u0433\u043e \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442\u0430 \u0438\u043d\u0436\u0435\u043d\u0435\u0440\u0430\u043c \u043f\u043e\u0442\u0440\u0435\u0431\u043e\u0432\u0430\u043b\u043e\u0441\u044c \u043f\u0440\u0435\u043e\u0434\u043e\u043b\u0435\u0442\u044c \u0441\u0435\u0440\u0438\u044e \u043d\u0435 \u043e\u0447\u0435\u0432\u0438\u0434\u043d\u044b\u0445 \u043f\u043e\u0434\u0432\u043e\u0434\u043d\u044b\u0445 \u043a\u0430\u043c\u043d\u0435\u0439. \u041d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, \u0434\u043b\u044f \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 \u043d\u0430 10-20% \u0431\u044b\u043b\u043e [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":113019,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-113018","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.0.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0418\u043d\u0436\u0435\u043d\u0435\u0440 \u0438\u0437 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438 Clyso \u043e\u0431\u043e\u0431\u0449\u0438\u043b \u043e\u043f\u044b\u0442 \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u044f \u043a\u043b\u0430\u0441\u0442\u0435\u0440\u0430 \u0445\u0440\u0430\u043d\u0435\u043d\u0438\u044f \u043d\u0430 \u0431\u0430\u0437\u0435 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sistema distribuito fault-tolerant Ceph, con una capacit\u00e0 superiore a un tebibyte al secondo. Si nota che questo \u00e8 il primo cluster basato su Ceph in grado di raggiungere un simile risultato, ma per ottenere questa performance, gli ingegneri hanno dovuto superare diverse insidie non evidenti. Ad esempio, per aumentare le prestazioni del 10-20%, \u00e8 stato","canonical_url":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/opyt-sozdaniya-hranilishha-ceph-c-propusknoj-sposobnostyu-tebibajt-v-sekundu","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"it_IT","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u041e\u043f\u044b\u0442 \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u044f \u0445\u0440\u0430\u043d\u0438\u043b\u0438\u0449\u0430 Ceph c \u043f\u0440\u043e\u043f\u0443\u0441\u043a\u043d\u043e\u0439 \u0441\u043f\u043e\u0441\u043e\u0431\u043d\u043e\u0441\u0442\u044c\u044e 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