oci-bv - Timed out waiting for backup to become available

Hi,

We are using a VolumeSnapshotClass as below for Block volume snapshotting:

apiVersion: snapshot.storage.k8s.io/v1
kind: VolumeSnapshotClass
metadata:
  name: oci-bv-snapshot-incremental
driver: blockvolume.csi.oraclecloud.com
parameters:
  backupType: incremental # No functional restore difference between full and incremental
deletionPolicy: Delete

This is integrated with CNPG for lower environment database volume snapshots.
Occasionally (every few weeks), we find these backups failing. with the error:

DeadlineExceeded desc = Timed out waiting for backup to become available

It looks like this is being thrown by the oci-bv csi here:
https://github.com/oracle/oci-cloud-controller-manager/blob/411bfeb22d242ba4c1f8b647884f507869968a2f/pkg/csi/driver/bv_controller.go#L1099

Which uses a timeout of 45 seconds as defined here:
https://github.com/oracle/oci-cloud-controller-manager/blob/411bfeb22d242ba4c1f8b647884f507869968a2f/pkg/csi/driver/bv_controller.go#L1068

However, in practice a 45 second timeout is too conservative, looking in the logs, we see the following times for snapshot creation in uk-london-1 between going from com.oraclecloud.BlockVolumes.CreateVolumeBackup.begin to com.oraclecloud.BlockVolumes.CreateVolumeBackup.end state.

Over 9 samples: average: 37.4 seconds | min: 34 seconds | max: 41 seconds

With a backupPollInterval of 5 seconds, the CSI steps just outside of the permissible timeout of 45 seconds.
https://github.com/oracle/oci-cloud-controller-manager/blob/master/pkg/oci/client/block_storage.go#L150C36-L150C60

https://github.com/oracle/oci-cloud-controller-manager/blob/master/pkg/oci/client/block_storage.go#L42

I believe the solution for this would be to increase the available timeout to 60 seconds to align better with the expected response times from the API.
https://github.com/oracle/oci-cloud-controller-manager/blob/411bfeb22d242ba4c1f8b647884f507869968a2f/pkg/csi/driver/bv_controller.go#L1068

Thanks!

Start in pkg/csi/driver/bv_controller.go around the 45-second backup timeout, then read the backup polling configuration in pkg/oci/client/block_storage.go. Confirm the timeout and polling behavior against the reported creation times; done means backup creation no longer fails prematurely for these expected API response times.