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| author | Joe Thornber <ejt@redhat.com> | 2016-09-22 12:15:21 +0200 |
|---|---|---|
| committer | Mike Snitzer <snitzer@redhat.com> | 2017-02-16 19:12:47 +0100 |
| commit | 629d0a8a1a104187db8fbf966e4cc5cfb6aa9a3c (patch) | |
| tree | df900a59355073aca34dd8de83d4ca631428cd6e /Documentation/device-mapper/cache.txt | |
| parent | dm cache metadata: use bitset cursor api to load discard bitset (diff) | |
| download | linux-629d0a8a1a104187db8fbf966e4cc5cfb6aa9a3c.tar.xz linux-629d0a8a1a104187db8fbf966e4cc5cfb6aa9a3c.zip | |
dm cache metadata: add "metadata2" feature
If "metadata2" is provided as a table argument when creating/loading a
cache target a more compact metadata format, with separate dirty bits,
is used. "metadata2" improves speed of shutting down a cache target.
Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'Documentation/device-mapper/cache.txt')
| -rw-r--r-- | Documentation/device-mapper/cache.txt | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/device-mapper/cache.txt b/Documentation/device-mapper/cache.txt index 785eab87aa71..f228604ddbcd 100644 --- a/Documentation/device-mapper/cache.txt +++ b/Documentation/device-mapper/cache.txt @@ -207,6 +207,10 @@ Optional feature arguments are: block, then the cache block is invalidated. To enable passthrough mode the cache must be clean. + metadata2 : use version 2 of the metadata. This stores the dirty bits + in a separate btree, which improves speed of shutting + down the cache. + A policy called 'default' is always registered. This is an alias for the policy we currently think is giving best all round performance. |