Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
On Wed, Feb 01, 2012 at 10:18:25PM +0100, Andreas Kurz wrote: > On 02/01/2012 05:15 PM, Frederic DeMarcy wrote: > > Hi Andrea > > > > Commenting out "csum-alg" doesn't seem to make any noticeable difference... > > However commenting out "data-integrity-alg" and running Test #2 again > > increases the throughput from ~ 61MB/s to ~ 97MB/s ! > > Note that I may well run into the 1Gb/s crossover link limit here since > > my network tests showed ~ 0.94 Gb/s > > > > Also Test #1 was wrong in my email... It should have been split in 2: > > Test #1 > > On non-DRBD device (/dev/sda) > > # dd if=/dev/zero of=/home/userxxx/disk-test.xxx bs=1M count=4096 > > oflag=direct > > Throughput ~ 420MB/s > > > > DRBD partition (/dev/sdb) on primary (secondary node disabled) > > Using Base DRBD config > > # dd if=/dev/zero of=/var/lib/mysql/TMP/disk-test.xxx bs=1M count=4096 > > oflag=direct > > Throughput ~ 205MB/s > > Is the result the same if you execute a "drbdadm invalidate-remote > mysql" on the primary before doing the "single node" test? .... that > would disable activity log updates ... ... with recent enough versions of DRBD. Only the OP seems to be using 8.3.7. Maybe you should consider an upgrade? -- : Lars Ellenberg : LINBIT | Your Way to High Availability : DRBD/HA support and consulting http://www.linbit.com