[Linux-cluster] Re: Minimal partition size for GFS2 filesystem

[Kaloyan Kovachev]

On Tue, 17 Nov 2009 12:07:00 +0000, Steven Whitehouse wrote
> Hi,
> 
> On Tue, 2009-11-17 at 12:53 +0100, brem belguebli wrote:
> > I think the constraint is just like for regular filesystems.
> > 
> > 1 GB should be right, shouldn't it ?
> > 
> Well there are journals of 128M each (default) so for two nodes, thats
> 256M, so with one or two smaller structures (they take only a few blocks
> each) 1G would seem a sensible minimum in this case,
> 

Yes 128M is by default but the minimum is 8M, so 8x2 jurnals = 16M + some
space for resource groups = 19M fs is possible with ~1M for data ... just
confirmed:

dd if=/dev/zero of=/tmp/test_gfs bs=1M count=19
losetup /dev/loop0 /tmp/test_gfs
mkfs.gfs2 /dev/loop0 -j 2 -J 8 -p lock_dlm -t a:b
mount -o lockproto=lock_nolock /dev/loop0 /mnt/tmp/

df -h result
/dev/loop0             19M   19M  840K  96% /mnt/tmp

> Steve.
> 
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