[Lustre-discuss] large ost and fsck

Andreas Dilger adilger at sun.com
Tue Oct 28 15:14:09 PDT 2008

On Oct 21, 2008  12:00 -0400, Kossey, Robert wrote:
> Can you be more specific about the 8TB limit?  Is it correct that this 
> is an 8TB base 2 (8796GB base 10) limit?

All filesystem limits are a result of base-2 issues.

> Does this limit apply to the raw device size or formatted Lustre OST 
> size?  Using RHEL5U1, we have created an OST on a 9.001 TB raw device 
> with a formatted size reported from lustre_config of 8584023MB.  Is this 
> OST OK to use, or would we have receive an error message if it was not OK?

For RHEL5 it is possible that a 9TB filesystem will work (I believe a fix
for this went into 1.6.6).  We just haven't finished our testing on it
yet.  There is no chance that a >= 8TiB filesystem would work with SLES10

Cheers, Andreas
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.

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