[DRBD-user] slow disk throughput

Florian Haas florian.haas at linbit.com
Tue Jun 17 10:05:09 CEST 2008


Florian Haas wrote:
> William, Lee,
> 
> William Francis wrote:
>>> Raw throughput on the same RAID10 array, non-drbd partition:
>>>
>>> time dd if=/dev/zero of=/tmp/delete/out.file bs=1M count=5000
> 
> You're not measuring throughput. You're measuring a mixture of
> throughput and latency, and not that of your disk but that of your page
> cache.
> 
> Also, you didn't give us much information about your underlying storage
> subsystem (SCSI or SATA, BBWC or not, disk speed & capacity, etc.). The
> DRBD version you are using would also be very helpful.

Oops, sorry. Saw your other email just now. OK so we already know the
DRBD version. Apologies :-)

Cheers,
Florian

-- 
: Florian G. Haas
: LINBIT Information Technologies GmbH
: Vivenotgasse 48, A-1120 Vienna, Austria



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