[DRBD-user] Re: Why is drbd 0.7.22 slow on Opteron 240 EE?

Corey Edwards tensai at zmonkey.org
Wed Nov 22 16:42:33 CET 2006

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, 2006-11-22 at 02:55 -0500, Maurice Volaski wrote:
> >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
> Here are the results for the two computers
> primary (faster one)
> 29.34 MB/sec (4294967296 B / 02:19.620474)
> secondary (slower one)
> 34.57 MB/sec (4294967296 B / 01:58.497313)
> How can such a fast I/O subsystem as a RAID 6 set of Seagate 750 GB 
> SATAII (3Gbs) drives off an Areca PCIe controller get such dismal 
> results?

It might be useful to compare the results to a test run directly on the
disks, sans DRBD. That way we would know if the slow down is due solely
to DRBD and not to a RAID configuration or a particular behavior of the


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