Hi James, This is just pure speculation, but can you assure that the bonding works correctly? Maybe you have issues there. I have seen a lot of incorrectly configured bonding throughout my life as unix admin. Maybe this could help you a little: http://www.wogri.at/Port-Channeling-802-3ad.338.0.html On 04/18/2013 01:46 PM, James Harper wrote: > I'm doing some basic testing so I'm not really fussed about poor performance, but my write performance appears to be so bad I think I'm doing something wrong. > > Using dd to test gives me kbytes/second for write performance for 4kb block sizes, while read performance is acceptable (for testing at least). For dd I'm using iflag=direct for read and oflag=direct for write testing. > > My setup, approximately, is: > > Two OSD's > . 1 x 7200RPM SATA disk each > . 2 x gigabit cluster network interfaces each in a bonded configuration directly attached (osd to osd, no switch) > . 1 x gigabit public network > . journal on another spindle > > Three MON's > . 1 each on the OSD's > . 1 on another server, which is also the one used for testing performance > > I'm using debian packages from ceph which are version 0.56.4 > > For comparison, my existing production storage is 2 servers running DRBD with iSCSI to the initiators which run Xen on top of a (C)LVM volumes on top of the iSCSI. Performance not spectacular but acceptable. The servers in question are the same specs as the servers I'm testing on. > > Where should I start looking for performance problems? I've tried running some of the benchmark stuff in the documentation but I haven't gotten very far... > > Thanks > > James > > -- > 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 > -- DI (FH) Wolfgang Hennerbichler Software Development Unit Advanced Computing Technologies RISC Software GmbH A company of the Johannes Kepler University Linz IT-Center Softwarepark 35 4232 Hagenberg Austria Phone: +43 7236 3343 245 Fax: +43 7236 3343 250 wolfgang.hennerbichler@xxxxxxxxxxxxxxxx http://www.risc-software.at -- 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
