manila/releasenotes/notes/bug-1890833-fix-cephfs-inco...

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---
upgrade:
- |
This version includes a fix to the CephFS drivers to address `an issue
<https://launchpad.net/bugs/1890833>`_ with total and free space calculation
in the CephFS driver. When you update, you will notice that the space
calculations reflect reality in your Ceph clusters, and provisioning may
fail if the share sizes exceed the cluster's free space. CephFS shares are
always thin provisioned, and the driver does not support oversubscription
via Manila; so space can be claimed for new shares as long as there is free
space on the cluster. Use the "reserved_share_percentage" back end
configuration option to ensure there's always space left aside for
provisioned workloads to grow over time.
fixes:
- |
The CephFS driver has now been fixed to report total and available space on
the storage system correctly. See `Launchpad bug#1890833
<https://launchpad.net/bugs/1890833>`_ for more details.
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The CephFS driver now honors the configuration option
"reserved_share_percentage", and it can be used to prevent save
space for provisioned workloads to grow over time.