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Update notes

Cluster update scheme

To improve user update experience and make the update path more flexible, MOSK is introducing a new scheme of updating between cluster releases. For the details and possible update paths, refer to 24.1.5 update notes: Cluster update scheme.

You can update to 24.2.1 either from 24.1.7 (major update) or 24.2 (patch update).

Expected impact when updating from 24.1.7

Update from 24.1.7 version is a major update between the series. Therefore, the expected impact and maintenance window for the major update to 24.2 series applies. For details, refer to 24.2 update notes

Expected impact when updating within the 24.2 series

The following table provides details on the impact of a MOSK cluster update to a patch release within the 24.2 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. Pay special attention to the known issue 50566 that may affect the maintenance window.

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.