325GB of free RAM but "insufficient memory" for new VMs

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Darren

New Member
Jul 28, 2016
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Code: 
root@roy-relativity-host1:~# free -h
              total        used        free      shared  buff/cache   available
Mem:           503G        175G         11G         53M        316G        325G
Swap:          7.4G        268M        7.1G

I have 325GB of RAM available but I cannot start any new VMs. I have the balloon driver active and installed on the existing VMs.

Can someone help me to spin up new VMs in this otherwise wasted space?
 
Sure. Let's start with getting the output of a VM that you're trying to start. If you could, just post the output of the command below, and that should give us a good starting point for more questions.

qm start <vmid>
 
Try: "echo 1 > /proc/sys/vm/drop_caches" to do a relatively safe and quick cache flush. You'll be able to start the VM after that.

Proxmox is a touch dumb about not starting a VM when OS memory caches are full, but there's plenty of memory.
 
While I could not spin up new VMs last week, it works this week. I am not sure if an update came down to fix it but I did nothing. RAM usage is steady at 200GB of 512GB. I don't get it.
 
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