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...
Or.
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