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Update notes

This section describes the specific actions you need to complete to accurately plan and successfully perform the update. Consider this information as a supplement to the generic update procedures published in Operations Guide: Update to a patch version.

Cluster update schema

You can update to the 25.2.6 version from the following cluster versions (patch update):

• 25.2 (2025-09-23)

• 25.2.1 (2025-10-08)

• 25.2.2 (2025-11-03)

• 25.2.3 (2025-12-01)

• 25.2.4 (2026-01-05)

• 25.2.5 (2026-02-03)

For the detailed cluster update schema, refer to MOSK cluster update schema.

Patch update impact and maintenance windows planning

The following table provides details on the impact of a MOSK cluster update to a patch release within the 25.2 series.

Note

For the detailed workflow of update to a patch release, refer to Update to a patch version.

Expected update impact

Updated component	Impact on cloud users	Impact on cloud workloads
OpenStack and Tungsten Fabric	~1% of read operations on cloud API resources may fail ~8% of create and update operations on cloud API resources may fail	Open vSwitch networking - interruption of North-South connectivity, depending on the type of virtual routers used by a workload: Distributed (DVR) routers - no interruption Non-distributed routers, High Availability (HA) mode - interruption up to 1 minute, usually less than 5 seconds [0] Non-distributed routers, non-HA mode - interruption up to 10 minutes [0] Tungsten Fabric networking - no impact
Ceph	~1% of read operations on object storage API may fail	IO performance degradation for Ceph-backed virtual storage devices.
Host OS components	No impact	No impact

[0] (1,2)

You can bypass updating components of the cloud data plane to avoid the network downtime during Update to a patch version. By using this technique, you accept the risk that some security fixes may not be applied.

Known issues during the update

Before updating the cluster, be sure to review the potential issues that may arise during the process and the recommended solutions to address them, as outlined in Known issues: Cluster update.

Pre-update actions

There are no specific pre-update actions required when updating to version 25.2.6.

Post-update actions

There are no specific post-update actions required when updating to version 25.2.6.