raw virtual disks, should they be converted to qcow2 ?

[RobFantini]

I was reading http://pve.proxmox.com/wiki/Storage_Migration and have a question.

We'll be moving some KVM from drbd to nfs storage.

Which vitual disk type is better to run on nfs - raw of qcow2 ?

 

[spirit]

Hi, depend what you need.

For best speed, use raw.

If you need advanced features (snapshots,clones,...), use qcow2.

qcow2 can be a little slower for write speed, but it really depend of your workload (random or seq io, directio, block size, etc....)

 

[RobFantini]

Thank you for the answer.

Disk moves in pve are a great tool that makes it very easy for us to move disks from drbd to nfs . then in the future to ceph, sheepdog or other choices.