Hi, I have a question that is not directly related to drbd, but more to performance of drbd on HW-Raid.
This is our configuration: 2 HP machines with ubuntu-Linux (LTS) configured HW Raid5 on 4 disks (DG146BB976 = 146.8GB 10k SAS) on each of the two machines LVM on that HW-RAID with 3 logical volumes (system, swap, data) DRBD on data-volume (ext4) over dedicated GiB-interface Now the question: what performance (iops) can I expect from that configuration? I don't really found useful information in the net, so I ask here. The drbd-interface gives about 40 tps (iostat -dk drbd1 5), which seems low to me. Also suspicious: %util is many times more than 98, and await is nearly always greater than svctm. These hints would allow to suspect an error, if I had only one disk - I have no idea which values to expect on my Raid5-configuration. Has anyone a hint or a guidance to how to calculate expectable values? Greetings Jan Dreyer
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