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rbd: note that thick-provisioning is deprecated

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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>
This commit is contained in:
Niels de Vos
2021-10-25 15:05:33 +02:00
committed by mergify[bot]
parent 0838845c6a
commit b132696e54
3 changed files with 15 additions and 4 deletions
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10
internal/rbd/controllerserver.go
View File

@ -1502,6 +1502,10 @@ func (cs *ControllerServer) ControllerExpandVolume(
}, nil
}
// logThickProvisioningDeprecation makes sure the deprecation warning about
// thick-provisining is logged only once.
var logThickProvisioningDeprecation = true
// isThickProvisionRequest returns true in case the request contains the
// `thickProvision` option set to `true`.
func isThickProvisionRequest(parameters map[string]string) bool {
@ -1517,5 +1521,11 @@ func isThickProvisionRequest(parameters map[string]string) bool {
return false
}
if logThickProvisioningDeprecation {
log.WarningLogMsg("thick-provisioning is deprecated and will " +
"be removed in a future release")
logThickProvisioningDeprecation = false
}
return thickBool
}