I think that skipping free space isn't main issue: backup of used space
is even slower.
17.10.2014 10:31, Alexandre DERUMIER пишет:
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" <[email protected]>
À: [email protected]
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
--
С уважением,
Дмитрий Петухов
Ведущий системный администратор
Отдел информационных технологий
ЗАО "Электро-ком"
phone: +79209755610
email: [email protected]
_______________________________________________
pve-devel mailing list
[email protected]
http://pve.proxmox.com/cgi-bin/mailman/listinfo/pve-devel
