[DRBD-user] Performance question

Jan.Dreyer at bertelsmann.de Jan.Dreyer at bertelsmann.de
Fri May 20 11:10:47 CEST 2011

Note: "permalinks" may not be as permanent as we would like,
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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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