diff options
| author | David Teigland <teigland@redhat.com> | 2018-08-27 14:53:09 -0500 |
|---|---|---|
| committer | David Teigland <teigland@redhat.com> | 2018-11-06 14:18:41 -0600 |
| commit | 3ae55695708b5d702f21daf776607d30cebe69c3 (patch) | |
| tree | 1483934ae24e143943d57dada29046c3db4c953d /tools/args.h | |
| parent | cac4a9743acb826d785c0e51e9a752d8959ced80 (diff) | |
| download | lvm2-3ae55695708b5d702f21daf776607d30cebe69c3.tar.gz | |
Add dm-writecache support
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)
Diffstat (limited to 'tools/args.h')
| -rw-r--r-- | tools/args.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/tools/args.h b/tools/args.h index adca84b2e..cc65be541 100644 --- a/tools/args.h +++ b/tools/args.h @@ -816,6 +816,9 @@ arg(withversions_ARG, '\0', "withversions", 0, 0, 0, "each configuration node. If the setting is deprecated, also display\n" "the version since which it is deprecated.\n") +arg(writecacheblocksize_ARG, '\0', "writecacheblocksize", sizekb_VAL, 0, 0, + "The block size to use for cache blocks in writecache.\n") + arg(writebehind_ARG, '\0', "writebehind", number_VAL, 0, 0, "The maximum number of outstanding writes that are allowed to\n" "devices in a RAID1 LV that is marked write-mostly.\n" |