{"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\/da\/blog\/news\/opyt-sozdaniya-hranilishha-ceph-c-propusknoj-sposobnostyu-tebibajt-v-sekundu","title":{"rendered":"Erfaring med at oprette et Ceph-lager med tebibyte b\u00e5ndbredde pr. sekund","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

En ingeni\u00f8r fra virksomheden Clyso har sammenfattet erfaringer med at oprette et lagringskluster baseret p\u00e5 det fejltolerante distribuerede system Ceph, med en b\u00e5ndbredde der overstiger tebibyte per sekund. Det bem\u00e6rkes, at dette er det f\u00f8rste kluster baseret p\u00e5 Ceph, der har form\u00e5et at n\u00e5 et s\u00e5dant niveau, men f\u00f8r de kunne opn\u00e5 det pr\u00e6senterede resultat, m\u00e5tte ingeni\u00f8rerne overvinde en r\u00e6kke uventede udfordringer. <\/p>\n

For eksempel var det tilstr\u00e6kkeligt at aktivere maksimal ydeevne i BIOS-indstillingerne for energieffektivitet p\u00e5 serverne for at \u00f8ge ydeevnen med 10-20% og deaktivere c-state (c-state \u00e6ndrer energibesparende indstillinger baseret p\u00e5 belastningen, hvilket p\u00e5virker Ceph). Det viser sig ogs\u00e5, at n\u00e5r der anvendes NVMe-lagring, bruger Linux-kernen en betydelig tid p\u00e5 at h\u00e5ndtere spin-l\u00e5se under opdatering af IOMMU-mapping. Deaktivering af IOMMU i kernen f\u00f8rte til en m\u00e6rkbar stigning i ydeevnen i tests for l\u00e6sning og skrivning af blokke p\u00e5 4MB. <\/p>\n

At the same time, disabling IOMMU did not resolve the performance issue during random writes of 4KB blocks. In investigating the matter, engineers came across fixes in the Ceph build scripts from the Gentoo and Ubuntu projects, which included building with the RelWithDebInfo option, as it applied the optimization mode '-O2' in GCC that significantly increased Ceph's performance. Compiling with the TCMalloc library also contributed to the performance drop. Modifying the compilation flags and discontinuing TCMalloc led to a threefold reduction in compaction time and doubled the performance of random 4K write operations. Finally, additional optimization of the Reef RocksDB settings and placement groups (PG) was performed. <\/p>\n

Klusteret er dannet af 68 noder baseret p\u00e5 servere<\/a> Dell PowerEdge R6615 med CPU AMD EPYC 9454P 48C\/96T. Hver node indeholder 10 NVMe-lagringsenheder fra Dell p\u00e5 15,36TB, to Ethernet-adaptere 100GbE Mellanox ConnectX-6 og 192 GB RAM. Softwaren er baseret p\u00e5 Ubuntu 20.04.6 og Ceph 17.2.7. I klusteret med 63 noder er der oprettet 630 OSD (Object Storage Daemon, baggrundsprocessen der styrer dataopbevaring i det lokale lagersystem, \u00e9n OSD per NVMe-lagringsenhed), tre MON-processer (monitor, der overv\u00e5ger klustrets tilstand) og \u00e9n MGR-proces (Manager, der styrer tjenesten). Lagringskapaciteten er 8,2 PB. <\/p>\n

The bandwidth for sequential read operations of 4MB blocks was 1025 GiB\/s, and for writes, it was 270 GiB\/s. For random reads of 4KB blocks, the performance reached 25.5 million read operations per second and 4.9 million for writes. Enabling encryption reduced the read bandwidth to around 750 GiB\/s. When using error correction codes EC62, the bandwidth was 547 GiB\/s for reads and 387 GiB\/s for writes (the write speed turned out to be higher than without error correction), while for random access, it achieved 3.4M IOPS for reads and 936K IOPS for writes.

\"Erfaring<\/center>
\"Erfaring<\/center> <\/p>\n

Yderligere kan det n\u00e6vnes, at i september blev en lignende milep\u00e6l i b\u00e5ndbredde i tebibyte pr. sekund n\u00e5et i CERN's eksabyt-lagringskluster, der er implementeret p\u00e5 en \u00e5ben distribueret lagringsl\u00f8sning EOS, bygget p\u00e5 XRootD-protokollen.
\n
Kilde: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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