Hi

 

What is the recommended xml config for optimum disk image performance on an nvme drive?

I am using a Samsung 950 Pro nvme presented as a disk in the array with VM images on it.

Please check my xml config below and let me know what parameters I need to change to get better IO performance from my w10 vms. thanks!

 

<devices>

    <emulator>/usr/local/sbin/qemu</emulator>

    <disk type='file' device='disk'>

      <driver name='qemu' type='qcow2' cache='writeback'/>

      <source file='/mnt/disk1/mohome/vdisk1.img'/>

      <backingStore/>

      <target dev='hdc' bus='virtio'/>

      <boot order='1'/>

      <alias name='virtio-disk2'/>

      <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>

    </disk>

so you have your nvme drive as part of the array.

That will make it slow. In the array parity has to be written to the parity aswell.

Far better to have as unassigned disk

so you have your nvme drive as part of the array.

That will make it slow. In the array parity has to be written to the parity aswell.

Far better to have as unassigned disk

 

 

It's not part of an array of disks it is the only drive since you can't run UNRAID without at least 1 drive assigned. I moved the image to another SSD just to rule the nvme drive out and the issue remains.