Entire System Backup

5 pts.
AS/400 backup
Backup to Tape
Entire System Backup
iSeries backup
Tape backup
Before I was using small tape for Entire System Back up (Fmt5gb) but now I'm using big tape (Qic 4gb) it take too long time to finish the back up how can I reduce the time?

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Your tape drive gets a write speed of maybe .7 MB’s a second.
LTO4 offerings right now easily performs at 120 MB’s a second.

Tape Drives and media have different read/write speeds as well as capacity.

You need to figure out what your data backup/retention requirements are.
Are you running backups once a day twice a day?
Full user backups each night? or once a week with incremental/differentials each night?
What’s your backup window? 2 hours a night?

Then there’s ROI and TCO requirements.
You bought a QIC which isn’t a first choice for backing your server.
An external LTO drive with a 5 or 6 tape changer can be picked up for cheap.

If you just want to make your backup window shorter.
Look at changing your backup scheme to conduct incremental backups during the week and run your full backups on the weekend. that should cut your nightly backups by leaps and bounds. But your restore process will have doubled in complexity.

Also look at submitted a bunch of manual SavLIb commands to run at the same time saving to individual save files. Then save all the save files. Again you’ve made restores more complex but your systems processor can probably write these libraries to a save file faster than your tape write speed. You’ll also need to ensure you have enough disk space.

IBM backup

You may consider a full backup once per month and save while active (SWA) nightly. This will simplify a restore process in that you would restore your system from the monthly save and then restore the last SWA save libraries. Keep in mind that if you need to save any libraries after your monthly full save, this/these saves would be the ones you would restore and then restore your SWA data.

I wouldn’t recommend this as it would substantially increase a restore process, but you could save with accpth *no. This will reduce your save time but you’d pay for it if you had to restore as all access paths would need to be rebuilt.

You want to make sure your tapes are initialized and your save specifies clear *none.

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  • azohawk
    What command Parms  are you using for INZTAP?  If you are using CHECK(*yes) and CLEAR(*yes) that will take much much longer than if you set those parms to *NO.
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