Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Hello, I have setup two Vmware virtual machines to replicate their storage with DRBD using protocol C. So far the write performance isn't as good as I had hoped. I have tested write performance using fio and right now the best I can get is write throughput and IOPS that are about 50-75% as good as with drbd replication disabled. My setup is two identical Centos 5.5 VMs running drbd 8.3.8. The link between them is two dedicated 10Gb adapters, no switch in between. I feel the link is not the bottleneck but something in my drbd config. I have followed the tuning recommendations on the linbit site and have seen some small improvements, but still don't have the performance I was hoping for. I thought I would be able to get a write penalty more like 10%, not the 25-50% I am seeing. I added no-disk-flushes; and no-md-flushes;. I set max buffers and max-epoch-size to 8196, and also experimented with several unplug-watermark sizes. I also set my hardware RAID controller to 100% write cache. I attached my drbd.conf. Any other ideas would be most appreciated. Thank you Sean -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.linbit.com/pipermail/drbd-user/attachments/20110103/3f83ccef/attachment.htm> -------------- next part -------------- An embedded and charset-unspecified text was scrubbed... Name: drbd.conf.txt URL: <http://lists.linbit.com/pipermail/drbd-user/attachments/20110103/3f83ccef/attachment.txt>