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

mmdelfs Command

Name

mmdelfs - Removes a GPFS file system.

Synopsis

mmdelfs Device [-p]

Description

The mmdelfs command removes all the structures for the specified file system from the nodes in the nodeset.

Before you can delete a file system using the mmdelfs command, you must unmount it on all nodes.

Results

Upon successful execution of the mmdelfs command, these tasks are completed on all nodes:

• Deletes the character device entry from /dev.
• Removes the mount point directory where the file system had been mounted.

Parameters

Device

The device name of the file system to be removed. File system names need not be fully qualified. fs0 is as acceptable as /dev/fs0.

This must be the first parameter.

Options

-p

Indicates that the disks are permanently damaged and the file system information should be removed from the GPFS cluster data even if the disks cannot be marked as available.

Exit status

0

Successful completion.

1

A failure has occurred.

Security

You must have root authority to run the mmdelfs command.

In an SP environment:

1. Verify the authentication method set for SP security services:
   1. If your authentication method is set to compatibility, Kerberos authentication is required. Issue the k4init command.
   2. If your authentication method is set to DCE, dce_login authentication is required.
   3. If your authentication method is set to NONE/std, there must be an entry in the /etc/sysctl.mmcmd.acl file on every node in the nodeset for the root user at every other node in the nodeset.

   For further information, see the latest IBM Parallel System Support Programs for AIX: Administration Guide, IBM Parallel System Support Programs for AIX: Command and Technical Reference, and RS/6000: Planning Volume 2, Control Workstation and Software Environment manuals at www.rs6000.ibm.com/resource/aix_resource/sp_books/pssp. Search for information on sysctl.

2. You may issue the mmdelfs command from any node running GPFS or the CWS.
3. If you are executing the mmdelfs command from the CWS on a multi-partitioned system, the SP_NAME environment variable must be properly set. It is suggested that you use a separate window for each partition and set the environment variable accordingly. For further information, see the IBM Parallel System Support Programs for AIX: Administration Guide and search for understanding system partitioning.

In an HACMP environment:

1. When using rcp and rsh 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 insure:
   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.
2. You may issue the mmdelfs command from any node in the GPFS cluster.

Examples

To delete file system fs0, enter:

mmdelfs fs0

The system displays information similar to:

mmdelfs: 6027-1366 Marking the disks as available
GPFS: 6027-573 All data on following disks of fs0 will be destroyed:
    gpfs9vsd
    gpfs10vsd
    gpfs15vsd
    gpfs17vsd
 
GPFS: 6027-574 Completed deletion of file system fs0.
mmdelfs: 6027-1371 Propagating the changes to all affected nodes.
This is an asynchronous process.
 

See also

mmcrfs Command

mmchfs Command

mmdf Command

mmlsfs Command

Location

/usr/lpp/mmfs/bin