Commits on Oct 27, 2021

1. rbd: note that thick-provisioning is deprecated …

   Thick-provisioning was introduced to make accounting of assigned space
   for volumes easier. When thick-provisioned volumes are the only consumer
   of the Ceph cluster, this works fine. However, it is unlikely that this
   is the case. Instead, accounting of the requested (thin-provisioned)
   size of volumes is much more practical as different types of volumes can
   be tracked.
   
   OpenShift already provides cluster-wide quotas, which can combine
   accounting of requested volumes by grouping different StorageClasses.
   
   In addition to the difficult practise of allowing only thick-provisioned
   RBD backed volumes, the performance makes thick-provisioning
   troublesome. As volumes need to be completely allocated, data needs to
   be written to the volume. This can take a long time, depending on the
   size of the volume. Provisioning, cloning and snapshotting becomes very
   much noticeable, and because of the additional time consumption, more
   prone to failures.
   
   Signed-off-by: Niels de Vos <ndevos@redhat.com>

   

   nixpanic authored and mergify-bot committed Oct 27, 2021
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