qcow2 on CephFS versus RBD

Nov 14, 2019
36
2
28
34
Hello,

we wonder which of the following two setups might be the better choice for using Proxmox VE with Ceph:
  • usual: RBD
  • less usual: qcow2 on CephFS
The second setup was mentioned in Thread.

What pros and cons do you come up with?

Cedric
 
RBD.

qcow2 on CephFS does not make sense for me.
 
To elaborate on Tom's answer. Qcow2 is a copy-on-write (COW) file, that will create double writes on CephFS. This is counter productive for performance. And is a redundant layer, as RBD is already suited for VM/CT image storage.
 

About

The Proxmox community has been around for many years and offers help and support for Proxmox VE, Proxmox Backup Server, and Proxmox Mail Gateway.
We think our community is one of the best thanks to people like you!

Get your subscription!

The Proxmox team works very hard to make sure you are running the best software and getting stable updates and security enhancements, as well as quick enterprise support. Tens of thousands of happy customers have a Proxmox subscription. Get yours easily in our online shop.

Buy now!