Backing up proves an emulator just works
June 27, 2013
Proving the concept of emulation for MPE operations is becoming popular this year. To offer evidence, longtime managers of 3000 servers check out the mundane as well as the specific tasks that drive their companies. Backup is a backbone of real IT -- and one evaluator shared his pleasure in watching the Stromasys CHARON HPA/3000 product improve on such an essential mission.
The process is somewhat different than on a physical HP 3000. First off, you can do backups while people are still on the 3000, if you have backup software to support that. When you configure the emulator, you specify a virtual tape drive, similar to the way you specify the virtual disc drives, with each virtual device pointing to a file in the Linux environment. Then, when you run MPE's STORE command, CHARON puts the data in the file associated with that virtual tape drive. When the backup is done, you can copy that file (using standard Linux commands) to some other backup media for archival.
One very nice thing I found is that CHARON doesn't ever run out of 'tape' on a backup. It just keeps growing the file as needed. When I configured our emulator environment, I configured the tape drive at 8GB, thinking that would be enough. However, when I finished the software install and had copied our test data, I had about 10GB worth. When I did the full system store, Charon successfully backed up everything and expanded the virtual tape drive size to be 10GB.
Later, when I did just a SYSGEN to the virtual tape drive, the file was only 5GB. No more having to worry about what tape density you're using -- and no more getting the 'please insert next tape' message on a backup.
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