I agree. The main problem is with used space. I didnt check for mirroring - but reading unused space for backup is super fast (around 1200mb/sec) But used space only 40-50mb/sec and too many iops...
-----Ursprüngliche Nachricht----- Von: pve-devel [mailto:pve-devel-boun...@pve.proxmox.com] Im Auftrag von Dmitry Petuhov Gesendet: Freitag, 17. Oktober 2014 09:25 An: Alexandre DERUMIER Cc: pve-devel@pve.proxmox.com Betreff: Re: [pve-devel] backup ceph high iops and slow 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" <mityapetu...@gmail.com> > À: pve-devel@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 > -- С уважением, Дмитрий Петухов Ведущий системный администратор Отдел информационных технологий ЗАО "Электро-ком" phone: +79209755610 email: d.petu...@electro-com.ru _______________________________________________ pve-devel mailing list pve-devel@pve.proxmox.com http://pve.proxmox.com/cgi-bin/mailman/listinfo/pve-devel _______________________________________________ pve-devel mailing list pve-devel@pve.proxmox.com http://pve.proxmox.com/cgi-bin/mailman/listinfo/pve-devel