[pve-devel] backup ceph high iops and slow

[Alexandre DERUMIER]

I have talked with ceph and qemu dev about this. (mainly from drive-mirror, but it's almost the same).

It's missing some feature in rbd block driver to skip zero block on read.

for restore no problem.

For drive-mirror write to target, it's also missing a feature to skip zero-block write.


----- Mail original ----- 

De: "Dmitry Petuhov" <mityapetuhov at gmail.com> 
À: pve-devel at pve.proxmox.com 
Envoyé: Vendredi 17 Octobre 2014 08:04:04 
Objet: Re: [pve-devel] backup ceph high iops and slow 

16.10.2014 22:33, VELARTIS Philipp Dürhammer пишет: 
> Why do backups with ceph make so high iops? 
> I get around 600 iops for 40mb/sec which is by the way very slow for a backup. 
> When I make a disk clone from local to ceph I get 120mb/sec (which is the network limit from the old proxmox nodes) and only around 100-120 iops which is the normal for a seq read with 120mb/sec... 
> Is the vzdump making problems? 
It's not vzdump's issue, but qemu's. See 
http://forum.proxmox.com/threads/19341-Ceph-backup 

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