[Lustre-devel] maximum MDT inode count
D. Marc Stearman
marc at llnl.gov
Thu Jun 19 08:13:42 PDT 2008
On our filesystem that was built to support BGL, we have 2B inodes
with 2T of capacity.
Inode count: 2097315840
Inodes per group: 32768
Inode blocks per group: 4096
Inode size: 512
We explicitly chose this number and put it in the XML when the
filesystem was built. Then the users changed their I/O pattern and
did not end up creating nearly as many files as we estimated. Since
then we have created file systems with a smaller number of inodes to
reduce fsck time. (Not really an issue as much now, though with the
fast fsck feature).
-Marc
----
D. Marc Stearman
LC Lustre Administration Lead
marc at llnl.gov
925.423.9670
Pager: 1.888.203.0641
On Jun 17, 2008, at 10:10 AM, Andreas Dilger wrote:
> For future filesystem compatibility, we are wondering if there are any
> Lustre MDT filesystems in existence that have 2B or more total inodes?
>
> This is fairly unlikely, because it would require an MDT filesystem
> that is > 8TB in size (which isn't even supported yet) and/or has been
> formatted with specific options to increase the total number of
> inodes.
>
> This can be checked with "dumpe2fs -h /dev/{mdtdev} | grep 'Inode
> count'"
> on the MDT.
>
>
> If there are issues with privacy, please email me directly.
> Otherwise,
> I think people would be interested to know what the larger MDT sizes
> are (even if they aren't as high as 2B inodes).
>
> Cheers, Andreas
> --
> Andreas Dilger
> Sr. Staff Engineer, Lustre Group
> Sun Microsystems of Canada, Inc.
>
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