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
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