> For the complete documentation index, see [llms.txt](https://docs.trilio.io/openstack/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.trilio.io/openstack/t4o-6.x/about-trilio-for-openstack/t4o-6.x-release-notes.md).

# Release Notes

## 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](/openstack/t4o-6.x/about-trilio-for-openstack/triliovault-for-openstack-architecture.md#dynamic-mount-service-dms) 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.