[Lustre-discuss] large ost and fsck

Andreas Dilger adilger at sun.com
Wed Oct 29 16:38:46 PDT 2008

On Oct 28, 2008  11:01 -0400, Kossey, Robert wrote:
> The original case raw size was 9.001TB(9,001,000,000,000 bytes), but the 
> (ext3?) formatted size reported by lustre_config was 8584023MB, which is 
> less than 8TiB.  However, we have tried another case with a raw size of 
> 11.0 TB, for which the formatted size is well above 8TiB:
> root> lfs df -h
> UUID                     bytes      Used Available  Use% Mounted on
> testfs-MDT0000_UUID     717.7G    472.6M    676.2G    0% /testfs[MDT:0]
> testfs-OST0000_UUID       9.8T    436.5M      9.3T    0% /testfs[OST:0]
> filesystem summary:       9.8T    436.5M      9.3T    0% /testfs
> So is it the case that > 8TiB is possible to create without errors, but 
> remains unsupported?

That is correct.  This may expose you to data corruption errors.  It may
not, we aren't sure yet because we haven't done testing beyond 8TB.

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

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