GPFS: Administration and Programming Reference - IRA Home

mmsnapdir Command
Name
mmsnapdir - Creates and deletes invisible directories that connect to the snapshots of a GPFS file
system, and changes the name of the snapshots subdirectory.
Synopsis
mmsnapdir Device {[-r | -a] [-s SnapDirName]}
Or,
mmsnapdir Device [-q]
Description
Use the mmsnapdir command to create or delete invisible directories that connect to the snapshots of a
GPFS file system, and change the name of the snapshots subdirectory.
Snapshots appear in a subdirectory in the root directory of the file system. If you prefer to access the
snapshots from each file system directory rather than traversing through the root directory, you may create
an invisible directory to make the connection by issuing the mmsnapdir command with the -a flag (see
Example 1 on page 268). The -a flag of the mmsnapdir command creates an invisible directory in each
normal directory in the active file system (they do not appear in directories in snapshots) that contains a
subdirectory for each existing snapshot of the file system. These subdirectories correspond to the copy of
the that directory in the snapshot with the same name.
If the mmsnapdir command is issued while another snapshot command is running, the mmsnapdir
command waits for that command to complete.
For more information about GPFS snapshots, see Creating and maintaining snapshots of GPFS file
systems in General Parallel File System: Advanced Administration Guide.
Parameters
Device
Options
The device name of the file system. File system names need not be fully-qualified. fs0 is just as
acceptable as /dev/fs0.
This must be the first parameter.
-a Adds a snapshots subdirectory to all subdirectories in the file system.
-q Displays current settings, if issued without any other flags.
-r Reverses the effect of the -a option. All invisible snapshot directories are removed. The snapshot
directory under the file system root directory is not affected.
-s SnapDirName
Changes the name of the snapshots subdirectory to SnapDirName. This affects both the directory
in the file system root as well as the invisible directory in the other file system directories if the
mmsnapdir -a command has been issued.
Exit status
0 Successful completion.
Chapter 8. GPFS commands 267