GPFS: Administration and Programming Reference - IRA Home

mmfsck Command
-n Specifies a no response to all prompts from the mmfsck command. The option reports
inconsistencies but it does not change the file system. To save this information, redirect it to an
output file when you issue the mmfsck command.
-o Specifies that the file system can be mounted during the operation of the mmfsck command.
Online mode does not perform a full file system consistency check, but blocks marked as allocated
that do not belong to a file are recovered. The -c and -o flags are mutually exclusive.
-y Specifies a yes response to all prompts from the mmfsck command. Use this option only on
severely damaged file systems. It allows the mmfsck command to take any action necessary for
repairs.
-t Directory
Specifies the directory to be used for temporary storage during mmfsck command processing.
The default directory is /tmp. The minimum space required (in byes) is equal to the maximum
number of inodes in the file system multiplied by 8.
-v Specifies the output is verbose.
-V Specifies the output is verbose and contain information for debugging purposes.
Exit status
0 Successful completion.
2 The command was interrupted before it completed checks or repairs.
4 The command changed the file system and it must now be restarted.
8 The file system contains damage that has not been repaired.
Security
You must have root authority to run the mmfsck command.
You may issue the mmfsck command from any node in the GPFS cluster.
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 the mmchcluster command,
you must ensure:
1. Proper authorization is granted to all nodes in the GPFS cluster.
2. The nodes in the GPFS cluster can communicate without the use of a password, and without any
extraneous messages.
Examples
1. To run the mmfsck command on the fs1 file system, receive a report, but not fix inconsistencies, issue
this command:
mmfsck fs1 -n
The system displays information similar to:
Checking "fs1"
Checking inodes
Checking inode map file
Checking directories and files
Checking log files
Checking extended attributes file
Checking allocation summary file
Checking policy file
Validated policy 'for stripe group fs1': parsed 3 Placement
178 GPFS: Administration and Programming Reference