Hi all…
I have 3 node DX cluster with around 50 VMs powered on residing on AHV.
We are planned for a rolling upgrade, CPU and storage resources are good enough.
However, memory utilization is a concern:
Memory of powered on VM = 690GB
Memory of powered off VM = 210GB
Memory usage 91%
Total pRAM = 754GB RAM
Will this be risky for a rolling upgrade given that no pRAM is added and no VM planned to power off?
Best answer by JeroenTielen
Do you have HA reservation turned on?
I don’t think so, so there will be vm’s shutdown as there will not be any ram available when a node is rebooting. If you want to control it shutdown VM’s that can safely been shutdown leaving the critical running.
Dont forget to turn on HA reservation as this will limit (or even warn you) when going over the memory limit for one node down.
+8Do you have HA reservation turned on?
I don’t think so, so there will be vm’s shutdown as there will not be any ram available when a node is rebooting. If you want to control it shutdown VM’s that can safely been shutdown leaving the critical running.
Dont forget to turn on HA reservation as this will limit (or even warn you) when going over the memory limit for one node down.
Hi
Thanks,
Mahendra.
+8Sorry for the late reply. Yes when HA reservation is turned on you cannot start a VM when you go over the limit. It will create an alert.
If you run LCM to update software, which requires a reboot, it will also show a banner saying there are not enough resources so virtual machines will be shut down.
Thank you
+8You can create custom alter policies in Prism Central. So that are warned at your own preferred threshold.
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