Hi,
I'm attempting to build a redundant storage solution using drbd replication, however I can't seem to get the performance I would have expected. I have the two servers on an Infiniband link, which has tested at about 170MB/s (Megabytes not Megabits) with netcat (CPU bound). Both disks write at just under 100MB/s (tested via dd). Yet when attempting to write to the drbd device on the primary I consistently get 30MB/s. I assume the problem must be something I've configured incorrectly, but for the life of me I can't figure out what it is. My configuration can be found at: http://pastie.org/737624 I have tried Google, and read and played with the tuning recommendations in the drbd manual, with no success. In an effort to demonstrate the problem is not network speeds, or the secondary, I have brought down the secondary, and still see the same performance: [r...@lager ~]# cat /proc/drbd version: 8.3.2 (api:88/proto:86-90) GIT-hash: dd7985327f146f33b86d4bff5ca8c94234ce840e build by [email protected], 2009-08-29 14:07:55 1: cs:WFConnection ro:Primary/Unknown ds:UpToDate/DUnknown C r---- ns:1048576 nr:0 dw:0 dr:1048576 al:0 bm:64 lo:0 pe:0 ua:0 ap:0 ep:1 wo:b oos:0 [r...@lager ~]# dd if=/dev/zero of=/dev/drbd1 bs=512M count=2 2+0 records in 2+0 records out 1073741824 bytes (1.1 GB) copied, 32.6865 seconds, 32.8 MB/s [r...@lager ~]# drbdadm down r0 [r...@lager ~]# dd if=/dev/zero of=/dev/sda2 bs=512M count=2 2+0 records in 2+0 records out 1073741824 bytes (1.1 GB) copied, 11.1106 seconds, 96.6 MB/s If anyone has any suggestions as to how I can troubleshoot this further it would be greatly appreciated. Thanks! Walton
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