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
