diff options
| author | Mike Marshall <hubcap@omnibond.com> | 2015-11-16 10:58:57 -0500 |
|---|---|---|
| committer | Mike Marshall <hubcap@omnibond.com> | 2015-11-16 10:58:57 -0500 |
| commit | a52079dad4718fa924ae81a939f8a665366f562b (patch) | |
| tree | a9d6004f9bf1beff49cbfe0d5bf6edbf621b065d /Documentation/device-mapper/snapshot.txt | |
| parent | 24c8d0804be00da90af9efa8eb404bd7a3284ba9 (diff) | |
| parent | 8005c49d9aea74d382f474ce11afbbc7d7130bec (diff) | |
| download | linux-a52079dad4718fa924ae81a939f8a665366f562b.tar.gz linux-a52079dad4718fa924ae81a939f8a665366f562b.tar.bz2 linux-a52079dad4718fa924ae81a939f8a665366f562b.zip | |
Orangefs: Merge tag 'v4.4-rc1' into for-next
Linux 4.4-rc1
Diffstat (limited to 'Documentation/device-mapper/snapshot.txt')
| -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> |