I run a proxmox 3 node cluster with several OMV vm's and one freenas VM.
My nodes are all dell: one R720xd and two R620's (All my OS disks and disks used for VM's on the hosts are SSD's / NVMe)
My systems run 24x7, but I am also a little concerned about power usage, so I do the following without really any noticeable performance issues.
- on the proxmox host I change the governor from performance to powersave, this does the most with a 20 to 40 w drop
- my OMV VM it is a little more complicated:
- I have 20 disks running in a separate disk shelf connected through LSI 9300-8e; The HBA is passed from the proxmox host to the VM (PCI passthrough), which allows the OMV vm to see the disks directly and have full control. I have the disk set to go to sleep through the smart setting within OMV, which saves a little power.