if you want to move all of the clients then follow this technote
DOCUMENTATION: How to move the image catalog on a UNIX Server
http://support.veritas.com/docs/323700
Manual: System Administrator's Guide for UNIX and Linux, Volume 1
Page: 354
Modification Type: Supplement
Modification:
This article details how to move the NetBackup for UNIX Servers' Image Catalog to a new location. This can be desirable when it has grown too large in size and is necessary to relocate the database to a place with more space available.
In preparation for moving the NetBackup Image Catalog from one location to another, Symantec strongly recommends performing a FULL Catalog backup before proceeding.
Note: Please perform the following steps carefully, as mis-configuration can cause problems.
Note: NetBackup does not support saving the catalog to a remote file system. Therefore, Symantec advises against moving the image catalog to a remote file system such as NFS or CIFS.
1. Shut down the NetBackup services on the master server. This may be done by running:
/usr/openv/netbackup/bin/netbackup stop
2. Copy the contents of the /usr/openv/netbackup/db/images directory to its new location, then rename the old images directory to images_bak as a backup copy.
cp -pr /usr/openv/netbackup/db/images /disk8/netbackup/db/images
3. Rename the old images directory to images_bak as a backup copy:
mv /usr/openv/netbackup/db/images /usr/openv/netbackup/db/images_bak
4. Create a symbolic link from /usr/openv/netbackup/db/images to the new location:
ln -s /disk8/netbackup/db/images /usr/openv/netbackup/db/images
5. Restart NetBackup services by running:
/usr/openv/netbackup/bin/netbackup start
6. Symantec recommends a full Hot NetBackup Catalog Backup after the relocation to test that the backup works correctly.
Note: If you are using the legacy offline catalog backup from versions prior TO 6.x, make sure to update the Offline Catalog Backup from the administration console by selecting the Catalog tab then right click and select Configure Offline catalog backup, then update the previous backup location to point to the new location of the image database. (Caution: Be certain to add the path for the image catalog and not the link name. Without the path, NetBackup cannot back up the new location. In this example, the path is /disk8/netbackup/db/images)
7. Check that you can search the Catalog and find images through the GUI and then if you wish, delete the images_bak folder created earlier.