[lustre-discuss] MDT partition getting full

[Radu Popescu]

Hi,

I have the following Lustre setup:

- servers
- number: 9
- Lustre version: 2.5.3
- OS: CentOS 6.6
- RPM URL: https://downloads.hpdd.intel.com/public/lustre/lustre-2.5.3/el6/server/RPMS/ <https://downloads.hpdd.intel.com/public/lustre/lustre-2.5.3/el6/server/RPMS/>

- clients
- number: 90
- Lustre version: 2.5.56
- OS: Debian Wheezy
- Packages were manually created from sources
- all clients have all 9 Lustre mountpoints

Lustre setup:

MGS + MDT + OST all stay on a single LUN which has a VG (160GB) created and 3 LVs for each of the partitions, all mounted on each server:

MGS - 4GB
MDT - 78.12GB
OST - 78.14GB

(I’ve chosen a comparable size for MDT and OST because of the small file size)
- Total number of files is at around 16 million, sizes between <1K and 1.7MB. They are not equally spread on all mountpoints so let’s say I have a 2M maximum number of files on a Lustre volume.

My problem is that MDT partition is getting full. Inodes are fine, only 3% used, which is ok, but the space used is > 50% used, and constantly dropping. So I think that within a week, I’ll be out of storage on all MDT partitions. And I didn’t specify any special options when creating MDT partitions, so bytes per inode should be at 16K (default setting).

Anyone has any ideas?

Thanks,
Radu
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