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dm-writecache is used like dm-cache with a standard LV as the cache. $ lvcreate -n main -L 128M -an foo /dev/loop0 $ lvcreate -n fast -L 32M -an foo /dev/pmem0 $ lvconvert --type writecache --cachepool fast foo/main $ lvs -a foo -o+devices LV VG Attr LSize Origin Devices [fast] foo -wi------- 32.00m /dev/pmem0(0) main foo Cwi------- 128.00m [main_wcorig] main_wcorig(0) [main_wcorig] foo -wi------- 128.00m /dev/loop0(0) $ lvchange -ay foo/main $ dmsetup table foo-main_wcorig: 0 262144 linear 7:0 2048 foo-main: 0 262144 writecache p 253:4 253:3 4096 0 foo-fast: 0 65536 linear 259:0 2048 $ lvchange -an foo/main $ lvconvert --splitcache foo/main $ lvs -a foo -o+devices LV VG Attr LSize Devices fast foo -wi------- 32.00m /dev/pmem0(0) main foo -wi------- 128.00m /dev/loop0(0)
39 lines
1.1 KiB
C
39 lines
1.1 KiB
C
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/*
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* LV types used in command definitions. The type strings are used
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* as LV suffixes, e.g. LV_type or LV_type1_type2.
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*
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* The final NULL arg can be replaced with lv_is_type() functions
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* if the current lv_is_type #defines become functions and are
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* moved to tools.h
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*
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* Until then, the lv_is_type() functions are called indirectly
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* through _lv_is_type().
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*/
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lvt(LVT_NONE, "", NULL)
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lvt(linear_LVT, "linear", NULL)
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lvt(striped_LVT, "striped", NULL)
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lvt(snapshot_LVT, "snapshot", NULL) /* lv_is_cow, lv_is_thick_snapshot */
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lvt(thin_LVT, "thin", NULL)
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lvt(thinpool_LVT, "thinpool", NULL)
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lvt(cache_LVT, "cache", NULL)
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lvt(cachepool_LVT, "cachepool", NULL)
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lvt(vdo_LVT, "vdo", NULL)
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lvt(vdopool_LVT, "vdopool", NULL)
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lvt(vdopooldata_LVT, "vdopooldata", NULL)
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lvt(mirror_LVT, "mirror", NULL)
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lvt(raid_LVT, "raid", NULL) /* any raid type */
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lvt(raid0_LVT, "raid0", NULL)
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lvt(raid1_LVT, "raid1", NULL)
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lvt(raid4_LVT, "raid4", NULL)
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lvt(raid5_LVT, "raid5", NULL)
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lvt(raid6_LVT, "raid6", NULL)
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lvt(raid10_LVT, "raid10", NULL)
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lvt(error_LVT, "error", NULL)
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lvt(zero_LVT, "zero", NULL)
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lvt(writecache_LVT, "writecache", NULL)
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lvt(LVT_COUNT, "", NULL)
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