Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
OK, I haven't been paying attention which means this is probably a stupid question, but is there a reason you're using the raw device instead of the drbd device when drbd is loaded? ...and does the drbd device show the same degradation? On Thu, 2007-03-29 at 12:46 -0500, Duane Cox wrote: > > > > ./dm -a 0 -b 1M -s 3G -y -m -p -o /dev/sdb > > 71.87 MB/sec (3221225472 B / 00:42.745236) > > > > ... > > > > ./dm -a 0 -b 1M -s 3G -y -m -p -o /dev/sdb > > 33.47 MB/sec (3221225472 B / 01:31.781341) > > > > > now I removed the module by running /etc/init.d/drbd stop > lsmod shows drbd was indeed removed.... > > ./dm -a 0 -b 1M -s 3G -y -m -p -o /dev/sdb > 71.99 MB/sec (3221225472 B / 00:42.672736) > > ./dm -a 0 -b 1M -s 3G -y -m -p -o /dev/sdb > 71.39 MB/sec (3221225472 B / 00:43.029786) > > ./dm -a 0 -b 1M -s 3G -y -m -p -o /dev/sdb > 72.55 MB/sec (3221225472 B / 00:42.341708) > > > tried MULTIPLE times on two identical pieces of hardware, and get the same > results: stable, consistent write throughput. > > so in summary, with the drbd module loaded (nd in disconnected state even), > write performance to the raw block device degrades over time... > > Thanks > Duane Cox > > > > _______________________________________________ > drbd-user mailing list > drbd-user at lists.linbit.com > http://lists.linbit.com/mailman/listinfo/drbd-user