Lustre 1.6 Operations Manual

24.1 Querying Filesystem Space
The lfs df command is used to determine available disk space on a filesystem. It
displays the amount of available disk space on the mounted Lustre filesystem and
shows space consumption per OST. If multiple Lustre filesystems are mounted, a
path may be specified, but is not required.
Option
Description
-h Human-readable print sizes in human readable format (for example:
1K, 234M, 5G).
-i, --inodes
Lists inodes instead of block usage.
Note – The df -i and fs df -i commands show the minimum number of inodes
that can be created in the filesystem. Depending on the configuration, it may be
possible to create more inodes than initially reported by df -i. Later, df -i
operations will show the current, estimated free inode count.
If the underlying filesystem has fewer free blocks than inodes, then the total inode
count for the filesystem reports only as many inodes as there are free blocks. This is
done because Lustre may need to store an external attribute for each new inode, and
it is better to report a free inode count that is the guaranteed, minimum number of
inodes that can be created.
24-2 Lustre 1.6 Operations Manual • September 2008