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| author | Ingo Molnar <mingo@kernel.org> | 2015-10-12 15:52:34 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-10-12 15:52:34 +0300 |
| commit | cdbcd239e2e264dc3ef7bc7865bcb8ec0023876f (patch) | |
| tree | 94f5d2cf92ebb2eee640862cb2beaab6503bf846 /Documentation/device-mapper | |
| parent | 6e06780a98f149f131d46c1108d4ae27f05a9357 (diff) | |
| parent | 7e0abcd6b7ec1452bf4a850fccbae44043c05806 (diff) | |
| download | linux-cdbcd239e2e264dc3ef7bc7865bcb8ec0023876f.tar.xz | |
Merge branch 'x86/ras' into ras/core, to pick up changes
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'Documentation/device-mapper')
| -rw-r--r-- | Documentation/device-mapper/snapshot.txt | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/Documentation/device-mapper/snapshot.txt b/Documentation/device-mapper/snapshot.txt index 0d5bc46dc167..ad6949bff2e3 100644 --- a/Documentation/device-mapper/snapshot.txt +++ b/Documentation/device-mapper/snapshot.txt @@ -41,9 +41,13 @@ useless and be disabled, returning errors. So it is important to monitor the amount of free space and expand the <COW device> before it fills up. <persistent?> is P (Persistent) or N (Not persistent - will not survive -after reboot). -The difference is that for transient snapshots less metadata must be -saved on disk - they can be kept in memory by the kernel. +after reboot). O (Overflow) can be added as a persistent store option +to allow userspace to advertise its support for seeing "Overflow" in the +snapshot status. So supported store types are "P", "PO" and "N". + +The difference between persistent and transient is with transient +snapshots less metadata must be saved on disk - they can be kept in +memory by the kernel. * snapshot-merge <origin> <COW device> <persistent> <chunksize> |