Shutdown 3 nodes out of 5 nodes cluster in mix of v8.4 and v9.2

[timlower]

Hi
We have a 5 nodes cluster:
- 2 at v9.2.21 (upgraded recently) in physical DC1
- 1 at v8.4.21 (pending upgrade) in physical DC1
- 2 at v8.4.21 (pending upgrade) in physical DC2

As part of DC1 power maintenance, we need to shutdown the 3 hosts (VMs/CTs can shutdown).

Any advice how to safely power off that 3 hosts and then, power up later?

Thanks.

 

[bbgeek17]

Hi @timlower, welcome to the forum.

Running mixed versions in one cluster isn’t supported as a long-term setup, and cluster-wide operations on a mixed cluster can behave unpredictably.

With all nodes on 9.2, you could use the cluster-wide HA disarm (ha-manager crm-command disarm-ha / arm-ha), which was introduced for exactly this kind of maintenance.
There is a manual workaround (pvecm expected), but it’s meant for recovery rather than planned maintenance, so I wouldn’t recommend it.

My suggestion: either finish the upgrade first and use the supported feature, or, if the maintenance can’t wait, build a small virtual replica of your cluster and rehearse the procedure there before touching production.

Cheers

---

Blockbridge : Ultra low latency all-NVME shared storage for Proxmox - https://www.blockbridge.com/proxmox