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rbd: add maxsnapshotsonimage flag

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Added maxsnapshotsonimage flag to flatten
the older rbd images on the chain to avoid
issue in krbd.The limit is in krbd since it
only allocate 1 4KiB page to handle all the
snapshot ids for an image.

The max limit is 510 as per
https://github.com/torvalds/linux/blob/
aaa2faab4ed8e5fe0111e04d6e168c028fe2987f/drivers/block/rbd.c#L98
in cephcsi we arekeeping the default to 450 to reserve 10%
to avoid issues.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
This commit is contained in:
Madhu Rajanna
2020-07-01 10:57:11 +05:30
committed by mergify[bot]
parent c04b903eca
commit 8ef7143e6c
6 changed files with 24 additions and 3 deletions
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2
charts/ceph-csi-rbd/values.yaml
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@ -113,6 +113,8 @@ provisioner:
# Soft limit for maximum number of nested volume clones that are taken before
# a flatten occurs
softMaxCloneDepth: 4
# Maximum number of snapshots allowed on rbd image without flattening
maxSnapshotsOnImage: 450
# skip image flattening if kernel support mapping of rbd images
# which has the deep-flatten feature
# skipForceFlatten: false