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Re: does XFS support block sizes other than 512 bytes?

To: xfs@xxxxxxxxxxx
Subject: Re: does XFS support block sizes other than 512 bytes?
From: Michael Monnerie <michael.monnerie@xxxxxxxxxxxxxxxxxxx>
Date: Mon, 20 Jul 2009 13:14:09 +0200
In-reply-to: <4A6119B5.6000706@xxxxxxxxx>
Organization: it-management http://it-management.at
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On Samstag 18 Juli 2009 Linda A. Walsh wrote:
> This one's a bit more specific than the last.  If memory serves me,
> XFS supported differing block sizes (which you could do on a hardware
> format of a SCSI drive) back on IRIX.  But when first ported to Linux
> it didn't work.  Was that ever fixed?  I seem to remember that going
> to 1-2K block sizes gave and extra 10%, and it almost seems logical
> that going to a 4kK block size would be ideal for xfs (presuming your
> disk doesn't start getting errors, then it might get harder to remap
> sectors and you'd hit hard disk failure (w/o remappable sectors)
> sooner.
>
> But at least 1K might be a reasonable tradeoff?  Been quite a while
> since I tried it and don't even know if the SAS drives allow it (if
> they do, I wonder if the newer SATA drives do?)

XFS can only use sector sizes that the hard disks provide. There will be 
4K drives from vendors "soon", and XFS is prepared to use that. 

mfg zmi
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