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Calculating swidth On A RAID6 Volume

To: "xfs@xxxxxxxxxxx" <xfs@xxxxxxxxxxx>
Subject: Calculating swidth On A RAID6 Volume
From: Andrew Debenham <adebenham@xxxxxxxxxxx>
Date: Tue, 20 Jul 2010 08:06:57 -0400
Accept-language: en-US
Acceptlanguage: en-US
Thread-index: AQHLKAQMTQEM1kgTjku89kxL2ccoNg==
Thread-topic: Calculating swidth On A RAID6 Volume
Hello -
I'm am new to XFS and am in the process of trying to tune an XFS file system.  I spent some time searching through this mailing list's archives but wasn't able to find anything that matched the question that I have (I apologize in advance if this issue has already been addressed).
I have a 3ware 9650SE-12M installed and have a RAID6 unit with 11 x 1.82 TB SATA drives and stripe size of 256KB.  I found an earlier thread that discussed calculating the values for sunit and swidth for RAID5, which stated that the swidth would be "sunit x (# disks in stripe - 1)".  So, finally the question - would the swidth for a RAID6 volume be "sunit x (# disks in stripe -2)?
If that is the case, then here is what I would expect my values to be:
sunit = 512
swidth = 4608
Would that be correct?  Thanks in advance for your help in this matter!
- Andrew 

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