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| author | Yan, Zheng <zyan@redhat.com> | 2018-04-17 13:46:30 +0200 |
|---|---|---|
| committer | Yan, Zheng <zyan@redhat.com> | 2018-04-27 13:08:19 +0200 |
| commit | 24bb126dbe443746de35167f8bd4d03c9644a5c0 (patch) | |
| tree | d3674cfa735df172a579dcf3b45aabdbe306dff9 /PendingReleaseNotes | |
| parent | mds: allow snapshot by default for new filesystem (diff) | |
| download | ceph-24bb126dbe443746de35167f8bd4d03c9644a5c0.tar.xz ceph-24bb126dbe443746de35167f8bd4d03c9644a5c0.zip | |
doc: add release notes for cephfs snapshot
Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
Diffstat (limited to 'PendingReleaseNotes')
| -rw-r--r-- | PendingReleaseNotes | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/PendingReleaseNotes b/PendingReleaseNotes index 43ad2e2758a..3ff0b84d859 100644 --- a/PendingReleaseNotes +++ b/PendingReleaseNotes @@ -63,6 +63,25 @@ significantly reducing the time of loading inodes for open files. MDS creates the table automatically if it does not exist. + * CephFS snapshot is now stable and enabled by default on new filesystems. + To enable snapshot on existing filesystems, use command: + - ceph fs set <fs_name> allow_new_snaps + + The on-disk format of snapshot metadata has changed. The old format + metadata can not be properly handled in multiple active MDS configuration. + To guarantee all snapshot metadata on existing filesystems get updated, + perform the sequence of upgrading the MDS cluster strictly. + + See http://docs.ceph.com/docs/master/cephfs/upgrading/ + + For filesystems that have ever enabled snapshot, the multiple-active MDS + feature is disabled by the new version MON. This will cause the "restore + previous max_mds" step in above URL to fail. To re-enable the feature, + either delete all old snapshots or scrub the whole filesystem: + + - ceph daemon <mds of rank 0> scrub_path / force recursive repair + - ceph daemon <mds of rank 0> scrub_path '~mdsdir' force recursive repair + * *RBD* * The RBD C API's rbd_discard method now enforces a maximum length of |