GPFS: Administration and Programming Reference - IRA Home

mmsnapdir Command
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Security
You must have root authority to run the mmsnapdir command.
You may issue the mmsnapdir 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 rename the .snapshots directory (the default snapshots directory name) to .link for file system fs1,
issue the command:
mmsnapdir fs1 -s .link
After the command has been issued, the directory structure would appear similar to:
/fs1/file1
/fs1/userA/file2
/fs1/userA/file3
/fs1/.link/snap1/file1
/fs1/.link/snap1/userA/file2
/fs1/.link/snap1/userA/file3
2. Issuing:
mmsnapdir fs1 -a
After the command has been issued, the directory structure would appear similar to:
/fs1/file1
/fs1/userA/file2
/fs1/userA/file3
/fs1/userA/.link/snap1/file2
/fs1/userA/.link/snap1/file3
/fs1/.link/snap1/file1
/fs1/.link/snap1/userA/file2
/fs1/.link/snap1/userA/file3
The .link subdirectory under the root directory and under each subdirectory of the tree provides two
different paths to each snapshot copy of a file. For example, /fs1/userA/.link/snap1/file2 and
/fs1/.link/snap1/userA/file2 are two different paths that access the same snapshot copy of
/fs1/userA/file2.
3. Issuing:
mmsnapdir fs1 -r
After the command has been issued, the directory structure would appear similar to:
/fs1/file1
/fs1/userA/file2
/fs1/userA/file3
/fs1/.link/snap1/file1
/fs1/.link/snap1/userA/file2
/fs1/.link/snap1/userA/file3
268 GPFS: Administration and Programming Reference