[DRBD-user] Slower disk throughput on DRBD partition

Frederic DeMarcy fred.demarcy.ml at gmail.com
Thu Feb 2 15:24:08 CET 2012


Hi Lars

I'm usinng 8.4.1

[root at server1 ~]# service drbd status
drbd driver loaded OK; device status:
version: 8.4.1 (api:1/proto:86-100)

Fred


On Thu, Feb 2, 2012 at 2:15 PM, Lars Ellenberg <lars.ellenberg at linbit.com>wrote:

> 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
> _______________________________________________
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>
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