> Do you have tried to compare virtio-blk and virtio-scsi ? >>How to change? Right now i'm using the PVE defaults => scsi-hd. (virtio-blk is "classic" virtio ;) >> Do you have tried directly from the host with the rbd kernel module ? >>No don't know how to use ;-) http://ceph.com/docs/master/rbd/rbd-ko/ #modprobe rbd #sudo rbd map {image-name} --pool {pool-name} --id {user-name} (then you'll have a /dev/rbd1) ----- Mail original ----- De: "Stefan Priebe - Profihost AG" <s.priebe@xxxxxxxxxxxx> À: "Alexandre DERUMIER" <aderumier@xxxxxxxxx> Cc: "Joao Eduardo Luis" <joao.luis@xxxxxxxxxxx>, ceph-devel@xxxxxxxxxxxxxxx, "Mark Nelson" <mark.nelson@xxxxxxxxxxx> Envoyé: Jeudi 8 Novembre 2012 10:02:23 Objet: Re: less cores more iops / speed Am 08.11.2012 09:58, schrieb Alexandre DERUMIER: >>> What do you mean by that? I'm talking about the KVM guest not about the >>> ceph nodes. > > Do you have tried to compare virtio-blk and virtio-scsi ? How to change? Right now i'm using the PVE defaults => scsi-hd. > Do you have tried directly from the host with the rbd kernel module ? No don't know how to use ;-) Stefan > ----- Mail original ----- > > De: "Stefan Priebe - Profihost AG" <s.priebe@xxxxxxxxxxxx> > À: "Mark Nelson" <mark.nelson@xxxxxxxxxxx> > Cc: "Joao Eduardo Luis" <joao.luis@xxxxxxxxxxx>, ceph-devel@xxxxxxxxxxxxxxx > Envoyé: Jeudi 8 Novembre 2012 09:45:17 > Objet: Re: less cores more iops / speed > > Am 08.11.2012 01:59, schrieb Mark Nelson: >> There's also the context switching overhead. It'd be interesting to >> know how much the writer processes were shifting around on cores. > What do you mean by that? I'm talking about the KVM guest not about the > ceph nodes. > >> Stefan, what tool were you using to do writes? > as always: fio ;-) > > Stefan > -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
