[DRBD-user] Two newbie questions
alex at crackpot.org
Wed Aug 4 18:30:15 CEST 2010
On Aug 4, 2010, at 9:12 AM, Steve Thompson wrote:
> New to DRBD; using it with two Dell PE2900 systems, CentOS 5.5 64-
> bit. Two questions:
> (1) I am using dual back-to-back gigabits with mtu=9000 for
> replication with bonding in balance-rr mode with no issues. The
> documentation suggests that active-backup mode be used. I'm getting
> an iperf performance across this link of 1.97 Gbits/sec, and a drbd
> sync of a single volume gets about 133 MB/sec, which is just a hair
> quicker than bonnie++ tells me that this file system can block-
> write. I'm interested in why the active-backup recommendation, and
> other folks' experiences with bonding.
I recall seeing a lot of dropped packets when doing drbd replication
over bonded crossover cables in balance-rr mode. Things were fine
under normal circumstances, and drops showed up when I really loaded
the primary. active-backup gave me enough throughput, so I switched.
That was on HP DL380s with Centos 5.5. I don't recall which ethernet
driver was in use.
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