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Re: Calculating swidth On A RAID6 Volume

To: xfs@xxxxxxxxxxx
Subject: Re: Calculating swidth On A RAID6 Volume
From: Emmanuel Florac <eflorac@xxxxxxxxxxxxxx>
Date: Tue, 20 Jul 2010 16:44:44 +0200
In-reply-to: <4C45AF09.5090901@xxxxxxxxxxxx>
Organization: Intellique
References: <3C5E029826A0704DB5998577FCFF46F0094DA1AD69@dagobah> <201007201522.39455@xxxxxx> <4C45AF09.5090901@xxxxxxxxxxxx>
Le Tue, 20 Jul 2010 16:13:29 +0200
Michael Weissenbacher <mw@xxxxxxxxxxxx> écrivait:

> IIRC sunit and swidth are both specified in units of 512 bytes (don't
> ask me why) 

Because this is the disk block size for all disks drives ever made
except the very latest ones (4096 bytes blocks) and the special
RAID-formatted 520 bytes sometimes in use in the past.

> so a sunit value of 512 would mean 256KB stripe size which
> is correct :-)

exactly. Or use su and sw to specify the size in k, m, etc.

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