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. (Also, the output from mmdf can be more up to date than the output from df.) Additionally, you can use the mmdf command to diagnose space problems that might result from fragmentation.

Note: The mmdf command may require considerable metadata I/O, 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
--------------- ------------- -------- -------- ----- -------------------- -------------------
Disks in storage pool: system (Maximum disk size allowed is 122 GB)
hd16vsdn10           17793024       -1 yes      yes        17538560 ( 99%)          1728 ( 0%)
hd3vsdn01             8880128        2 yes      yes         8658176 ( 98%)          1600 ( 0%)
hd4vsdn01             8880128        2 yes      yes         8616448 ( 97%)          1384 ( 0%)
hd15vsdn10           17793024       10 yes      yes        17539584 ( 99%)          1664 ( 0%)
hd13vsdn02            8880128     4001 yes      yes         8663552 ( 98%)          1776 ( 0%)
hd8vsdn01             8880128     4002 yes      yes         8659200 ( 98%)          1936 ( 0%)
hd5vsdn01             8880128     4002 yes      yes         8654848 ( 97%)          1728 ( 0%)
hd33n09              17796008     4003 yes      yes        17540864 ( 99%)          2240 ( 0%)
                -------------                         -------------------- -------------------
(pool total)        257800488                             252091136 ( 98%)         46928 ( 0%)

Disks in storage pool: fs1sp1 (Maximum disk size allowed is 122 GB)
hd30n01               8897968        8 no       yes         8895488 (100%)           424 ( 0%)
hd31n01               8897968        8 no       yes         8895488 (100%)           424 ( 0%)
                -------------                         -------------------- -------------------
(pool total)         17795936                              17790976 (100%)           848 ( 0%)

                =============                         ==================== ===================
(data)              266716296                             261222144 ( 98%)         44576 ( 0%)
(metadata)          248920360                             243217408 ( 98%)         46048 ( 0%)
                =============                         ==================== ===================
(total)             275596424                             269882112 ( 98%)         47776 ( 0%)

Inode Information
-----------------
Number of used inodes:            9799
Number of free inodes:         4990393
Number of allocated inodes:    5000192
Maximum number of inodes:      5000192

For complete usage information, see the mmdf command.