Tivoli Storage Manager Installing the Clients


Appendix B. Special Considerations for AFS/DFS on AIX

If you install TSM on an AIX workstation, and you plan to back up and archive Andrew File System (AFS) or Distributed File System (DFS) files, you can do the following:

The AFS/DFS clients require the AFS/DFS Support license on your TSM server. For additional information, refer to Tivoli Storage Manager for UNIX Using the Backup-Archive Clients, SH26-4122.


Using the AFS/DFS Versions of Executable Files

TSM includes executable files for the graphical user interface and for the command-line interface in non-AFS/DFS versions, AFS, and DFS versions.

The non-AFS/DFS versions are dsm and dsmc. The AFS versions are dsmafs and dsmcafs. The DFS versions are dsmdfs and dsmcdfs.

If you perform a command line backup of AFS or DFS files using the non-AFS/DFS versions of the executable files, TSM backs up the files and saves standard UNIX access permissions and extended permissions. TSM does not back up AFS or DFS access control lists for directories, and does not honor virtual mount points.

By default, when performing an incremental backup on any AFS or DFS mount point, TSM does not traverse the mount points. TSM only backs up the mount point metadata. To back up the mount point as a regular directory and traverse the mount point, set the dfsbackupmntpnt option to No before performing the backup. If you want to back up a mount point as mount point and back up the data below the mount point, first back up the parent directory of the mount point and then back up the mount point seperately as a virtual mount point.

If you want to restore an AFS or DFS mount point and the data for each mount point, restore the mount point first by restoring the parent directory, then restore the virtual mount point. If you do not restore the mount point first, TSM creates a local directory by the same name as mount point under the parent directory and restores data in that directory.

If you want TSM to back up AFS access control lists, you must use the AFS versions of the executable files. You can do that in one of the following ways:

If you want TSM to back up DFS access control lists, you must use the DFS versions of the executable files. You can do that in one of the following ways:

Note:
When restoring large files (1GB or more) with AFS or DFS, or very large files (2GB) with HSM or the backup-archive client, set the system ulimit to unlimited (-1). TSM can restore these large files with enough system resources. There may be restore failures if the ulimit is set too low.

Identifying AFS/DFS User Accounts for Backup and Archive

When you back up AFS or DFS files, you want TSM to begin checking files for eligibility at the directory that begins a user account.

To identify where a user account begins, you can use the virtualmountpoint option in the client system options file.

For example, to define a virtual mount point in AFS for a user named Steiner, you could enter the following:

   virtualmountpoint /afs/almaden.ibm.com/u/steiner

Attention: If you do not specify a virtual mount point for AFS or DFS, TSM must check the entire AFS or DFS directory tree beginning with /afs or /... to find the files a user can back up. That can take a long time. You probably do not want to allow TSM to check the entire AFS or DFS directory.

For more detailed information about using the AFS/DFS Backup Clients, refer to Tivoli Storage Manager for UNIX Using the Backup-Archive Clients, SH26-4122.

For detailed information about using the virtualmountpoint option, see Virtualmountpoint.


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