On Thu, Apr 18, 2013 at 04:19:09PM +0200, Emmanuel Lacour wrote: > > 1) If you put your journals on the same devices, you are doing 2 > > writes for every incoming write since we do full data journalling. > > Assuming that's the case we are down to 25MB/s. > > >
to reduce this double write overhead, I tried to put the journal on tmpfs and I got far better performances, nearly equal to the slower disk. So with low count of osd and low performance osd data drives, the only way to go seems to put the journal on ssd. _______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
