Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
On Wednesday 04 August 2010 18:30:15 Alex Dean wrote: > 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. > > alex > _______________________________________________ > drbd-user mailing list > drbd-user at lists.linbit.com > http://lists.linbit.com/mailman/listinfo/drbd-user > So you were basically running with one gigabat NIC at the time ... I use balance-rr and performance was better during test, admittedly when the storage was not stressed. Might try again doing iperf, but I guess results will be total bandwidth minus what DRBD uses, which I cannot really tell. B.