Add documentation about snapshots #10436
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| @@ -60,6 +60,11 @@ writing, but there is insufficient testing to provide stability guarantees and | |||
| every expansion of testing has generally revealed new issues. If you do enable | |||
| snapshots and experience failure, manual intervention will be needed. | |||
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| Snapshots are known not to work properly with multiple filesystems (below) in | |||
| some cases. Specifically, if you share a pool for multiple FSes and delete | |||
| a snapshot in one FS, expect to lose snapshottedfile data in any other FS using | |||
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maybe we should add note about snapshot does not work with multiple active MDS
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| @@ -60,6 +60,13 @@ writing, but there is insufficient testing to provide stability guarantees and | |||
| every expansion of testing has generally revealed new issues. If you do enable | |||
| snapshots and experience failure, manual intervention will be needed. | |||
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| Snapshots are known not to work properly with multiple filesystems (below) in | |||
| some cases. Specifically, if you share a pool for multiple FSes and delete | |||
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You mean specifically sharing data pools, right? I think Doug has a patch to forbid that (it's definitely already unsafe).
Then pool sharing will become possible with, http://tracker.ceph.com/issues/15066 so I guess at that point we'll need to put something in to ensure that at most one filesystem using a particular data pool can have snapshots enabled.
Signed-off-by: Greg Farnum <gfarnum@redhat.com>
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This includes some broader developer data that should give people a base when looking at our snapshotting system. It also adds a warning about multi-FS and snapshot compatibility problems.