Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
/ 2006-11-21 03:39:01 -0500 \ Maurice Volaski: > On fresh sync of /dev/drbd2, which is 1.4 TB, I'm seeing an average 20.3 MB per second. When I test with ttcp, I > routinely see about 64 MB per second. Write tests with dd if=/dev/zero of=/maurice/bonnie/hello bs=400M count=10 I suggest you # wget http://svn.drbd.org/drbd/trunk/benchmark/dm.c # gcc -O -o dm dm.c and then to benchmark: ./dm -x -a 0 -s 4g -b 20m -m -y -p -o /maurice/bonnie/hello and go from there. you can combine this with netcat. > appear to show a write speed on the secondary of about 160 MB per second, so it doesn't appear that the secondary > has any obvious I/O bottleneck. > > So shouldn't drbd be much faster than it actually is? > > I also notice that the secondary is often unresponsive to command line commands and I see messages in the log of > the primary: > drbd2: [drbd2_worker/9750] sock_sendmsg time expired, ko = 3 seems like your secondary needs a lot of time to process the writes. -- : Lars Ellenberg Tel +43-1-8178292-0 : : LINBIT Information Technologies GmbH Fax +43-1-8178292-82 : : Schoenbrunner Str. 244, A-1120 Vienna/Europe http://www.linbit.com : __ please use the "List-Reply" function of your email client.