[Lustre-discuss] large ost and fsck

[Andreas Dilger]

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.