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Support custom hybrid OSD creation (--hybrid --fast-devices /dev/xxx,/dev/yyy)

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This commit is contained in:
Vitaliy Filippov
2024-11-04 17:52:29 +03:00
parent adca162278
commit 56de4a520d
5 changed files with 108 additions and 56 deletions
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src/disk_tool/disk_tool.cpp
+10 -6
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@@ -27,12 +27,16 @@ static const char *help_text =
" --osd_per_disk <N>\n"
" Create <N> OSDs on each disk (default 1)\n"
" --hybrid\n"
" Prepare hybrid (HDD+SSD) OSDs using provided devices. SSDs will be used for\n"
" journals and metadata, HDDs will be used for data. Partitions for journals and\n"
" metadata will be created automatically. Whether disks are SSD or HDD is decided\n"
" by the `/sys/block/.../queue/rotational` flag. In hybrid mode, default object\n"
" size is 1 MB instead of 128 KB, default journal size is 1 GB instead of 32 MB,\n"
" and throttle_small_writes is enabled by default.\n"
" Prepare hybrid (HDD+SSD, NVMe+SATA or etc) OSDs using provided devices. By default,\n"
" any passed SSDs will be used for journals and metadata, HDDs will be used for data,\n"
" but you can override this behaviour with --fast-devices option. Journal and metadata\n"
" partitions will be created automatically. In the default mode, SSD and HDD disks\n"
" are distinguished by the `/sys/block/.../queue/rotational` flag. When HDDs are used\n"
" for data in hybrid mode, default block_size is 1 MB instead of 128 KB, default journal\n"
" size is 1 GB instead of 32 MB, and throttle_small_writes is enabled by default.\n"
" --fast-devices /dev/nvmeX,/dev/nvmeY\n"
" In --hybrid mode, use these devices for journal and metadata instead of auto-detecting\n"
" and extracting them from the main [devices...] list.\n"
" --disable_data_fsync auto\n"
" Disable data device cache and fsync (1/yes/true = on, default auto)\n"
" --disable_meta_fsync auto\n"