I am not 100% sure if this is the correct place to ask this question, or seek help and advice with this issue.
The issue that I am facing is.
We have a cluster configuration with 4 servers within the cluster. The issue that happened is, while I was doing the proxmox upgrade an all of the installations. I upgraded from 6.4 to 7.2.
The process I followed was
1. migrate all VMs from proxmox2 to proxmox3,
2. do the upgrade on proxmox2,
3. migrate the VMs back to proxmox2 on completion of the migration.
The issue that we ran into was that when migrating from proxmox2 to proxmox3 the VM migrated without hassles, but when I reverted back from proxmox3 to proxmox2, the VM hung. The only way we could recover was to fully reboot the VM, after which everything worked as normal.
It seems that there is a known issue when migrating a VM between CPU types. If the migration moves backwards, from a powerful CPU to a lesser powerful CPU, the migration goes well. If you migrate from a lesser to a more powerful CPU, then the VM hangs. migration is not successful.
Below is a list of the CPUs I have on the 4 servers.
proxmox2 - 64 x Intel(R) Xeon(R) Silver 4216 CPU @ 2.10GHz (2 Sockets)
proxmox3 - 32 x Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz (2 Sockets)
proxmox8 - 12 x Intel(R) Xeon(R) CPU E5-2603 v4 @ 1.70GHz (2 Sockets
proxmox9 - 12 x Intel(R) Xeon(R) CPU E5-2603 v4 @ 1.70GHz (2 Sockets)
What concerns me and I am not 100% clear on the impact, is the stability and functionality of the cluster environment. If this is a known issue, how safe is my fail-over environment? Is there a work-around or patch that can be implemented to elevate the issue.
Thanks
Lawrence Lamprecht
The issue that I am facing is.
We have a cluster configuration with 4 servers within the cluster. The issue that happened is, while I was doing the proxmox upgrade an all of the installations. I upgraded from 6.4 to 7.2.
The process I followed was
1. migrate all VMs from proxmox2 to proxmox3,
2. do the upgrade on proxmox2,
3. migrate the VMs back to proxmox2 on completion of the migration.
The issue that we ran into was that when migrating from proxmox2 to proxmox3 the VM migrated without hassles, but when I reverted back from proxmox3 to proxmox2, the VM hung. The only way we could recover was to fully reboot the VM, after which everything worked as normal.
It seems that there is a known issue when migrating a VM between CPU types. If the migration moves backwards, from a powerful CPU to a lesser powerful CPU, the migration goes well. If you migrate from a lesser to a more powerful CPU, then the VM hangs. migration is not successful.
Below is a list of the CPUs I have on the 4 servers.
proxmox2 - 64 x Intel(R) Xeon(R) Silver 4216 CPU @ 2.10GHz (2 Sockets)
proxmox3 - 32 x Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz (2 Sockets)
proxmox8 - 12 x Intel(R) Xeon(R) CPU E5-2603 v4 @ 1.70GHz (2 Sockets
proxmox9 - 12 x Intel(R) Xeon(R) CPU E5-2603 v4 @ 1.70GHz (2 Sockets)
What concerns me and I am not 100% clear on the impact, is the stability and functionality of the cluster environment. If this is a known issue, how safe is my fail-over environment? Is there a work-around or patch that can be implemented to elevate the issue.
Thanks
Lawrence Lamprecht
