IBM General Parallel File System for AIX: Administration and Programming Reference

Querying file system space

Although you can use the df command to summarize the amount of free space on all GPFS disks, the mmdf command is useful for determining how well-balanced the file system is across your disks. You can also use mmdf to diagnose space problems that might result from fragmentation.

Note:

The mmdf command is an I/O intensive command and should be run when the system load is light.

Specify the file system you want to query with the mmdf command. For example, to query available space on all disks in the file system fs1, enter:

mmdf fs1

The system displays information similar to:

disk            disk size  failure holds    holds         free KB         free KB
name                in KB    group metadata data   in full blocks    in fragments
--------------- --------- -------- -------- ----- --------------- ---------------
gpfs20vsd         8880128     4015 yes      yes     8869888 (100%)       352 ( 0%)
gpfs21vsd         8880128     4015 yes      yes     8869888 (100%)       344 ( 0%)
                ---------                          -------------- --------------
(total)          17760256                          17739776 (100%)       696 ( 0%)
 
Inode Information
------------------
Total Number of Inodes: 17408
Total number of free inodes: 17399

See the mmdf Command for complete usage information.