Determining Media Classes

It is important to have sufficient volumes enrolled in the BRMS scratch pool before performing a save operation. A media scratch pool is a group of available (expired and unused) media that share the same media class. BRMS draws the media it uses for backup and recovery operations from this pool. You are likely to need at least four volumes to perform the backups that are discussed in this chapter. Use two to back up your system data with the *SYSGRP control group, and two to back up your non-system data with the *BKUGRP control group, or use all four to backup your entire system using the *SYSTEM control group. You may need more or fewer tapes depending on the capacity of your media and the size of your system.

BRMS groups each tape into a media class, which allows BRMS to track and protect the active data on your media by type. A media class refers to the grouping of media by similar characteristics, for example, media density and capacity.

During installation, BRMS creates default device information based on the type of device attached to your system at that time. If more than one tape device is attached, BRMS takes as its default device the fastest and most automated device that is attached. BRMS bases the default media class on the default device type. For example, if you have a 6380 tape device attached to your system, the media class might be QICxxx. In this case, the class prefix (QIC) signifies a 1/4" tape and the x's indicate different densities.

To perform the backups that are discussed in this chapter, you must use two different media classes:

You can find the default media class name assigned by BRMS in the system policy. To get there, perform the following steps:

  1. Type GO BRMSYSPCY at a command line.
  2. At the System Policy menu, select option 1 (Display or Change system policy).
  3. At the Change System Policy display, note the media class name that is specified in the Media class field.
  4. Use this media class name when you enroll the media for the *BKUGRP backup.

                           Change System Policy                      RCHAS400   
                                                                                
 Type choices, press Enter.                                                     
                                                                                
  Media policy . . . . . . . . . . . . . . FULL          Name, F4 for list      
  Devices. . . . . . . . . . . . . . . . . TAP01         Name, F4 for list 
                                                                                
                                                                                
  Home location for media  . . . . . . . . *HOME         Name, F4 for list      
  Media class  . . . . . . . . . . . . . . QIC2GB        Name, F4 for list      
  Sign off interactive users . . . . . . . *NO           *YES, *NO              
  Sign off limit . . . . . . . . . . . . .  30           0-999 minutes          
  Output queue . . . . . . . . . . . . . . *PRTF         Name, *PRTF            
    Library  . . . . . . . . . . . . . . .               Name, *LIBL            
  Day start time . . . . . . . . . . . . .  0:00:00      Time                   
  Media monitor  . . . . . . . . . . . . . *YES          *YES, *NO              
  Shared inventory delay . . . . . . . . .   60          30-9999 seconds        
  Auto enroll media  . . . . . . . . . . . *NO           *NO, *YES              
  Default usage. . . . . . . . . . . . . . *YES          *NO, *YES              
                                                                                
                                                                       More...  
 F3=Exit   F4=Prompt   F5=Refresh   F12=Cancel

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