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doc: rbd-mirroring: Explain snapshot mirroring

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* Rectify that snapshot based mirroring is point-in-time consistent
* Reword slightly s.t. there is less repetition.

Based on the discussion in https://lists.ceph.io/hyperkitty/list/ceph-users@ceph.io/thread/G6ZW5OP4IXGUBAJTKZDPABK7HCKYISQH/

Signed-off-by: Hans van den Bogert <hansbogert@gmail.com>
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Hans Bogert 2020-05-29 00:06:30 +02:00 committed by Hans van den Bogert
parent 6d6c4eb016
commit 6cb0fe6d61
1 changed files with 4 additions and 4 deletions
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8
doc/rbd/rbd-mirroring.rst
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@ -21,10 +21,10 @@ capability is available in two modes:
updates between two mirror-snapshots and copy the deltas to its local copy of
the image. With the help of the RBD fast-diff image feature, updated data
blocks can be quickly computed without the need to scan the full RBD image.
Since this mode is not point-in-time consistent, the full snapshot delta will
need to be synced prior to use during a failover scenario. Any partially
applied snapshot deltas will be rolled back to the last fully synced snapshot
prior to use.
Since this mode is not as fine-grained as journaling, the complete delta
between two snapshots will need to be synced prior to use during a failover
scenario. Any partially applied set of deltas will be rolled back at moment
of failover.
.. note:: journal-based mirroring requires the Ceph Jewel release or later;
snapshot-based mirroring requires the Ceph Octopus release or later.