[Lustre-discuss] large ost and fsck

Kossey, Robert bob.kossey at hp.com
Tue Oct 28 08:01:20 PDT 2008

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?


 > >/ Using RHEL5U1, we have created an OST on a 9.001 TB
 > /
 > TiB or TB?  Respectively those amount to
 > 9,896,704,161,611.776 and 9,001,000,000,000 bytes.
 > When those are converted to TiB they are are:
 > 9.001 and 8.18636 TiB (respectively) which are both more than 8TiB.
 > >/ Is this
 > />/ OST OK to use, or would we have receive an error message
 > if it was not OK?
 > /
 > I'm not sure what the consequences of using an OST > 8TiB are to be
 > honest.
 > b.

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