On 06/21/2011 09:51 PM, wang xuchen wrote:
Digimer,
Thanks for your reply.
I come up with the number 300M from DRBD official website "A good rule
of thumb for this value(rate parameter) is to use about 30% of the
available replication bandwidth. ". I use 10G Ethernet card for
replication traffic, 1024M * 0.3 is 300M. What wrong with my calculation?
Ben
That is your network speed. Have you calculated your maximum disk I/O?
During resync, you should see how quickly the resync is running at. Is
it actually going at ~300MB/sec? If your IO is well over 300MB/sec, then
I am not sure off hand what is causing the slowdown.
Are all ten DRBD resources on the same set of drives? If so, then
perhaps the disks' read/write heads are flogged? To test, can you
'pause-sync' on all but one resource at a time and see if performance
returns? If it does, then resume-sync one resource at a time and see at
what point the performance becomes unacceptable.
--
Digimer
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