GPFS: Administration and Programming Reference - IRA Home

mmdf Command
Exit status
0 Successful completion.
nonzero A failure has occurred.
Security
If you are a root user:
1. You may issue the mmdf command from any node in the GPFS cluster.
2. When using the rcp and rsh commands for remote communication, a properly configured .rhosts file
must exist in the root user’s home directory on each node in the GPFS cluster. If you have designated
the use of a different remote communication program on either the mmcrcluster or mmchcluster
command, you must ensure:
a. Proper authorization is granted to all nodes in the GPFS cluster.
b. The nodes in the GPFS cluster can communicate without the use of a password, and without any
extraneous messages.
If you are a non-root user, you may specify only file systems that belong to the same cluster as the node
on which the mmdf command was issued.
Examples
1. To query all disks in the fs2 file system that can hold data, issue this command:
mmdf fs2 -d
The system displays information similar to:
disk disk size failure holds holds free KB in free KB in
name in KB group metadata data full blocks fragments
----------- --------- -------- -------- ---- ----------- ---------
Disks in storage pool: system
------------- -------- ----------
(pool total) 0 0 (0%) 0 (0%)
Disks in storage pool: sp1
gpfs1002nsd 8897968 1 no yes 8342016 (94%) 928 (0%)
--------- ------------- ------------
(pool total) 8897968 8342016 (94%) 928 (0%)
========= ============== ============
(data) 8897968 8342016 (94%) 928 (0%)
(metadata) 0 0 (0%) 0 (0%)
========= ============= ============
(total) 8897968 8342016 (94%) 928 (0%)
2. To query all disks in the fs2 file system that can hold metadata, issue this command:
mmdf fs2 -m
The system displays information similar to:
disk disk size failure holds holds free KB in free KB in
name in KB group metadata data full blocks fragments
----------- --------- -------- -------- ---- ---------- ----------
Disks in storage pool: system
gpfs1001nsd 8897968 4001 yes no 8738816 (98%) 1520 (0%)
--------- ------------- ---------
(pool total) 8897968 8738816 (98%) 1520 (0%)
Disks in storage pool: sp1
--------- ------------ ----–----
(pool total) 0 0 (0%) 0 (0%)
166 GPFS: Administration and Programming Reference