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Re: [Linux-cluster] FS Block Size Limit



Ken Preslan wrote:

On Fri, Sep 03, 2004 at 12:40:49PM +0200, Richard Mayhew wrote:


I tried to format our 4 GFS partitions with a block size of 8192 (twice
the default) to correspond with the default raw block size on the SAN's
LUN's to do some performace comparisons with no success. Any block size
1024*X < 4096 worked with no problems, anything larger than 4096 came
back with an error when trying to mount the file system.

Any idea as to why there is a limit set to 4096?



Linux filesystems can't have block sizes greater than the machine's page size. For x86 and x86_64 that's 4096 bytes. I've seen 16k pages on a IA64 box, so you can go larger there.

I remember some threads on LKML about larger page sizes on x86.

Not sure on the current status, but you'll want to look into "page cluster".

Mike


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