[PVE-User] Problem Cloning Disk

[Alexandre DERUMIER]

>>No, I have not found that at all. Our benchmarks and usage tests bear this 
>>out. 

I just want to warning you that cephfs is not considered as stable by ceph team.
(also missing fsck feature for example)

I'm interested if you can to have some benchmark (fio for example) between rbd vs ceph+qcow2.

>>And snapshot performqance on rbd - live and restores is truly awful, orders 
>>of magnitude worse than qcow2. And we use them for development and testing a 
>>lot. 

Hammer release will have a new feature called "object map", which should give use
instant snapshot/resize/...
I'll try to implement it in proxmox


>>Which is beside the point - I had the same error trying to clone from rbd to 
>>rbd. Proxmox is not allocating a large enough image for the copy. 

Strange, I never see this problem.


----- Mail original -----
De: "Lindsay Mathieson" <lindsay.mathieson at gmail.com>
À: "aderumier" <aderumier at odiso.com>, "proxmoxve" <pve-user at pve.proxmox.com>
Envoyé: Jeudi 26 Mars 2015 13:17:10
Objet: Re: [PVE-User] Problem Cloning Disk

On Thu, 26 Mar 2015 01:18:26 PM you wrote: 
> >> '/mnt/cephfs/images/201/vm-201-disk-1.qcow2', 
> 
> why do you use qcow2 file on top of cephfs ?????????? 
> 
> you should use ceph as a block device through rbd. 
> 
> (performance will be awfull with qcow2 on top of cephfs) 


No, I have not found that at all. Our benchmarks and usage tests bear this 
out. 

And snapshot performqance on rbd - live and restores is truly awful, orders 
of magnitude worse than qcow2. And we use them for development and testing a 
lot. 


Which is beside the point - I had the same error trying to clone from rbd to 
rbd. Proxmox is not allocating a large enough image for the copy.