[Linux-cluster] GFS 2Tb limit

Stephen Willey stephen.willey at framestore-cfc.com
Thu Sep 2 15:09:38 UTC 2004

William Lee Irwin III wrote:
> On Wed, Sep 01, 2004 at 12:31:41PM +0100, Stephen Willey wrote:
>>There was a post a while back asking about 2Tb limits and the consensus 
>>was that with 2.6 you should be able to exceed the 2Tb limit with GFS.  
>>I've been trying several ways to get GFS working including using 
>>software raidtabs and LVM (seperately :) ) and everytime I try to use 
>>mkfs.gfs on a block device larger than 2Tb I get the following:
>>Command: mkfs.gfs -p lock_dlm -t cluster1:gfs1 -j 8 /dev/md0
>>Result: mkfs.gfs: can't determine size of /dev/md0: File too large
>>(/dev/md0 is obviously something different when using LVM or direct 
>>block device access)
>>Does anyone have a working GFS filesystem larger than 2Tb (or know how 
>>to make one)?
>>Without being able to scale past 2Tb, GFS becomes pretty useless for us...
>>Thanks for any help,
> Either your utility is not opening the file with O_LARGEFILE or an
> O_LARGEFILE check has been incorrectly processed by the kernel. Please
> strace the utility and include the compressed results as a MIME
> attachment. Remember to compress the results, as most MTA's will reject
> messages of excessive size, in particular, mine.
> -- wli

MD'd two 1.8Tb RAIDs together to form a 3.8Tb /dev/md0
mkfs.jfs /dev/md0 was successful
mkfs.gfs -p lock_dlm -t cluster1:gfs1 -j 8 /dev/md0 failed as expected 
with a File too large error

The strace output should be attached...


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