During installation of CA Top Secret VM, you are asked to define certain database sharing options. Specifically, you must indicate whether the Security Data Base is shared among multiple CA Top Secret systems and, if so, whether the system you are installing is responsible for performing the DASD-to-DASD backups of the Security File. This daily disk-to-disk copy of the Security File to the Backup File is an integral part of CA Top Secret's built-in recovery features; therefore, you should ensure that one, and only one, system is operating at all times with the BACKUP(hhmm) control option set to an appropriate time, while all others in a shared environment have BACKUP(OFF). In a non-shared environment, be sure that BACKUP is enabled in the CA Top Secret VM startup keywords.
For the purpose of obtaining this daily backup in a shared environment, it does not matter which system (nor type of host operating system - VM, MVS, or VSE) is selected to perform backups. Your choice should be based on your systems' operating schedules, the availability and requirements of automated operations tools of which you might wish to make use to trigger the tape backup step (below), or your operations staff's schedule and responsiveness to different systems during off-hours.
Note: Neither tape backups nor Security File reconstruction has to be done on the system that performs the backups.
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