The Backstore Engine › USS Backstore › Configure the USS Backstore File System › Detailed Configuration Instructions

Detailed Configuration Instructions

In order to insure proper Backstore Primary and Failover Server functionality, each SVTS subsystem in a CA Vtape Complex must share the same USS mount points. To facilitate this, we recommend sharing the same VUSSMNTS parmlib member.

Note: It is not required for the <StartupOptions> RootDirectory = '/u/users/vtape' attribute to match.

To configure the USS Backstore file system

1. Customize the VUSSMNTS member to include the <Triplex> section is at a minimum.

   <USSMountPoints>      
                       
   <Triplex>            
    DSName  = VTAPE.TRIPLEX         
    FSType  = NFS     
    PARMS  =  10.130.42.54:'            + ip address       
              '"/nas/vtape/triplex"'    ; drive directory  
   

   Observe the following:

   • The DSName attribute depends on the FSType attribute. When FSType is either HFS or ZFS then DSName is the actual dataset name. When FSType is NFS, then DSName is a name selected by you to represent the file system.
   • The FSType attribute indicates the type of file system to be mounted. The valid settings are HFS, ZFS or NFS.
   • The PARMS attribute is intended for NFS file systems and conveys the NFS server name or TCPIP address along with the path name to be mounted on the NFS server. Note that other NFS mount attributes may be added to the PARMS attribute. For more information, see the IBM documentation z/OS Network File System Guide and Reference.
2. Setup the VTGROUPS parmlib member and indicate what combinations of Backstore copies are desired at the group level:

   <GroupDefinitions>         
                              
     Group01 = USS_Only       
     Group02 = Primary_Duplex
        ...
     Group74=
   
   <USS_Only>                          
     Description='USS Only'            
     MB_Threshold               = 2000 
     ShortRetention             =    7 
     MediumRetention            =   21 
     Triplex                    =  USS 
     RecallAttemptsThreshold    =    2
   

   Observe the following:

   • The attribute Triplex=USS can be assigned to as many of the 32 groups as desired.
   • Other valid combinations are:
     • Triplex only
     • Primary only
     • Primary and Duplex
     • Primary and Triplex
     • Primary, Duplex and Triplex
3. Change the parmlib directory section to include the new VUSSMNTS member. We recommend sharing the VUSSMNTS member with all SVTS subsystems in the same CA Vtape Complex.

   <ParmlibDirectory>   
     USSMountPoints     = VUSSMNTS
   

4. Change the < StartupOptions> section to include the new UnixSystemServices and RootDirectory attributes.

   <StartupOptions>                
        UnixSystemServices=Y       
        RootDirectory='/u/users/vtape'   
   

5. Start the SVTS subsystem.

   When starting with the USS mount point section for the first time, the directory structure is built and the file systems are mounted dynamically. The file system attributes are saved in the control files to be used on subsequent restarts to insure the file system settings do not change without confirmation. Additionally, a timed routine checks to insure the file systems are mounted properly every 5 minutes.