RAID-5/Stripe Size and verifying absolute disk stripe access

Sten Daniel Soersdal netslists at
Thu Apr 10 11:01:54 UTC 2008

My problem is aligning reads/writes properly on a 3 disk RAID-5 volume 
with stripe size of 16384. Since my measurements all show the same 
relatively low read/write performance on the volume matter which offset 
i choose on the disklabel "partition" (i've tried with the granularity 
of a single sector and the results are the same).

In FreeBSD 7.0-RELEASE, is there any way to find out a absolute 
read/write sector location for the beginning of filesystem within a 
disklabel "partition"?

Sten Daniel Soersdal

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