Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
On Thu, Jan 6, 2011 at 8:11 AM, Or Gerlitz <ogerlitz at voltaire.com> wrote: > On 1/4/2011 2:46 AM, Sean McCreadie wrote: > > 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. > > > Were you able to get closer to the throughput in non-replicated > configuration when using protocol A instead of C? Using very much the same > params as in your configuration, I see that protocol A buys me better > latency but not any further bandwidth. > > I'm on 500 MB/s for replicating one drbd lun, 1GB/s for two and the same > for three. My underline interconnect is Infiniband/DDR whose bandwidth is > 1900MB/s. These disks can yield 1600 MBs for drbd read test or write test > when the connection is off. So I'm also hitting some unknown (yet, to me) > bottleneck... > Have you checked CPU usage? Look at all your processors, one of them may be maxxed. I've noticed the DRBD threads tend to all run on a single core. -JR -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.linbit.com/pipermail/drbd-user/attachments/20110106/429b87a1/attachment.htm>