Re: [ceph-users] Redundant networks in Ceph

2015-06-28 Thread Alex Gorbachev
Hi Nick, I know what you mean, no matter how hard you try something unexpected > always happens. That said I think OSD timeouts should be higher than HSRP > and spanning tree convergence times, so I think it should survive most > incidents that I can think of. > So for high speed networking (40+

Re: [ceph-users] qemu (or librbd in general) - very high load on client side

2015-06-28 Thread Alexandre DERUMIER
Hi , yes librbd can use a lot of cpu, mainly if you want to do a lot of iops. I have benched it vs krbd driver, and even with tcmalloc/jemalloc fio librbd use twice more cpu than krbd. as qemu use only 1 thread by default for all disks, this is a bottleneck. using multiple iothreads (1by disk)

Re: [ceph-users] Redundant networks in Ceph

2015-06-28 Thread Nick Fisk
> -Original Message- > From: Alex Gorbachev [mailto:a...@iss-integration.com] > Sent: 28 June 2015 18:57 > To: Nick Fisk > Cc: ceph-users@lists.ceph.com > Subject: Re: [ceph-users] Redundant networks in Ceph > > Hi Nick, > > I know what you mean, no matter how hard you try something unexp