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

To: Russell Cattelan <cattelan@xxxxxxxxxxx>, xfs-oss <xfs@xxxxxxxxxxx>
Subject: Re: does XFS support block sizes other than 512 bytes?
From: "Linda A. Walsh" <xfs@xxxxxxxxx>
Date: Tue, 28 Jul 2009 18:31:41 -0700
In-reply-to: <4A671E44.4040305@xxxxxxx>
References: <4A6119B5.6000706@xxxxxxxxx> <4A671E44.4040305@xxxxxxx>
User-agent: Thunderbird 2.0.0.22 (Windows/20090605)


Russell Cattelan wrote:
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?)
Yes
XFS can support any power of 2 sector size up to the page size of your
system.
And it is recommend that on things like raid5 devices that the sector
size be
set to the same size as the filesystem block size.

thanks more... :-)
-linda
---
        Just tried a 146GB-15K Seagate Cheetah SAS.  It didn't like anything 
other than 512bytes.  Any larger size ended up with a 528 byte sector size 
which really miffed the linux kernel so bad, it wouldn't expose it as a device
in /dev.  If you don't know mknod and the correct dev num, it would
make for a very interesting time formatting it back down.  ;-)

Do you know what brands might allow resizing?  You say SATA might
allow...just a WAG...but maybe a Seagate SATA might not? ;^)

Also, I wonder what might happen with a HW RAID card -- if it would
deal with 4K block sizes.  It deals with up to 1MB stripe sizes...so
you'd think it'd handle 4K block sizes...???
Thanks for the fun times so far...;^)



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