To use scratch pools with the CA VM:Tape interface to HSC, you must implement CA VM:Tape scratch pools. CA VM:Tape then defines the scratch pools to the HSC service virtual machine when the CA VM:Tape interface to HSC is started. You can define scratch pools only once each time the HSC is initialized.
Note: It is possible to define the scratch pools to HSC in the HSC configuration file. In this case CA VM:Tape cannot define the scratch pools to HSC.
If your site is using the CA VM:Tape interface to HSC, you should use scratch pool names that contain no more than 13 characters, or names that are unique within the first 13 characters, to avoid potential operational problems. This is because the HSC only supports scratch pool names up to 13 characters in length. When CA VM:Tape supplies the HSC server with CA VM:Tape scratch pool names, the HSC server truncates any names that contain more than 13 characters. If you have more than one CA VM:Tape scratch pool defined with the same first 13 characters, the HSC server will process only one pool. Any other scratch pools that have the same name will be ignored by the HSC.
For optimum performance, define all tapes in specific CA VM:Tape scratch pools, rather than letting them default to the general pool. The CA VM:Tape general pool is not defined in the HSC, and therefore the HSC does not know which tapes are in the general pool. If you specify the CA VM:Tape general pool, the HSC will have to search for the correct tape, creating a delay and potentially causing the process to fail.
For information about implementing CA VM:Tape scratch pools, see the Scratch Pools.
Note: If you are using the Autopick facility, you will not be using HSC to pick scratch tapes. With the Autopick facility, CA VM:Tape picks the scratch tape for each scratch mount and asks HSC to mount it. For scratch mounts without the Autopick facility, CA VM:Tape asks HSC for a scratch tape from the appropriate scratch pool.
CA VM:Tape assigns scratch pools as follows: CA VM:Tape alphabetizes the tape pool names it finds in the file defined with the POOLNAME configuration record. CA VM:Tape then sends this alphabetized list to the HSC; each entry in this list is sent with a corresponding pool number starting with pool number 1. Because tape pool names are alphabetized before being sent to the HSC, it is possible that the order in which you enter tape pool names in your POOLNAME file is different from how they are defined in the HSC.
Note: If you define your scratch pools in the HSC configuration file, you must be sure that the resulting alphabetized pool names list in CA VM:Tape matches the order in which the pool names are entered in your HSC configuration file.
If a scratch request is made for a tape that is not in a predefined pool, the request is sent to the HSC with a scratch pool number of 0.
CA VM:Tape scratch pool support does not associate label types with scratch pools. The HSC, therefore, selects the site default label type.
During a scratch mount request, message 0722E may be generated, indicating that HSC has exhausted its supply of scratch tapes. This message may also indicate that scratch pools containing only reels have been defined to the HSC. The text of the message includes the CA VM:Tape poolname, or the word GENERAL. Message 0722E is followed by message 0698R that prompts the operator to retry the mount, cancel the mount, or convert the mount to a manual mount.
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