Release Notes

6.2.1

Release Date : 21st Aug'2026

What's New?

1. New Qualifcation

   • Qualification support for RHOSO18.0-FR6 (18.0.21).

   • Qualification support for Canonical Jammy.

   • Qualification support for Sunbeam Canonical 2024.1 (Caracal) on Noble.

   • Qualification support for MOSK & OS Helm.

2. New Features

   • Unified import and reassign operator.

   • Tenant chargeback csv download.

   • Upgrade from 5.x to 6.2.1 on Kolla-Ansible.

3. Enhancements

   • Nova Server Group Preservation — the Nova server group each protected instance belongs to is now captured with every Snapshot and reapplied when the instance is restored, preserving affinity / anti-affinity placement across restore, migration and disaster recovery. Selective Restore lets you choose the target server group per instance; One Click Restore reuses the captured group automatically. See Features for details.

4. Bug Fixes

   • VM restored via selective restore after deletion of original VM automatically becomes the member of the workload.

   • Selective restore fails with error : you cannot attach a port multiple times.

   • Pre-created port IP not attached to the VM from selective restore attempted from API.

   • Misleading error message in selective restore Failed restoring snapshot: Timeout waiting for the instance to boot from volume even after waiting for 4 minutes.

   • Selective restore fails with error that port is still in use.

   • NFS mount hangs on 6.2 release.

   • Unauthorized Backup Operations Are Not Properly Rejected.

   • Snapshot-create API blocks wlm-api worker for full snapshot duration → scheduled backups fail with "Proxy Error" under load.

   • Unexpected Workload VM Membership Loss.

   • API for usage report.

   • s3fuse segment cache unbounded in aggregate → repeated OOM kills of s3vaultfuse → mount outages fail snapshots.

   • Preserve Nova Server Group Metadata During RHOSP16.2 to RHOSO18 VM Migration/Restore

Known Issues

1. Snapshot mount fails on Kolla Ubuntu Flamingo.

2. Horizon: snapshot/restore cancel buttons broken; snapshot row click hangs on Loading. This issue is intermittent.

   • Workaround:

     • Refresh the page and try cancel operation again.

3. 504 gateway timeout error in bulk deletion of error state snapshot from UI.

   • Workaround:

     • Delete multiple snapshots (in loop) from CLI using a script which will delete 1 snapshot at a time.

4. Retention failing intermittently with NFS V4.

6.2.0

Release Date : 30th April'2026

What's New?

1. Support for Kolla Epoxy (2025.1) & Kolla Flamingo (2025.2) [For Rocky 9 & Ubuntu 24.04].

2. Dynamic Mount Service (DMS) — backup targets are now mounted per-job and reference-counted across controller and compute nodes, replacing the previous per-backup-target container model. See T4O Architecture for an overview.

3. S3 backup-target credentials are now retrieved from OpenStack Barbican at mount time through the new secret_ref field on the backup target, instead of being supplied in configuration.

Known Issues

1. Snapshot mount fails on Kolla Ubuntu Flamingo.

2. Incremental backups fail after upgrading to T4O-6.2.0 when using immutable Ceph S3 backup target (mainly for image booted instances).

   • Workaround:

     • Initiate a Full snapshot.

3. Workload Reset operation fails to cleanup the volume snapshots.

4. Workload Import getting stuck.

5. Horizon: snapshot/restore cancel buttons broken; snapshot row click hangs on Loading. This issue is intermittent.

   • Workaround:

     • Refresh the page and try cancel operation again.

6. 504 gateway timeout error in bulk deletion of error state snapshot from UI.

   • Workaround:

     • Delete multiple snapshots (in loop) from CLI using a script which will delete 1 snapshot at a time.

7. Retention failing intermittently with NFS V4.