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Ensuring sufficient iSeries system backup for data protection

Ken Graap explains how an option 21 save (full system save) once a month is not sufficient to protect system disk information if only a daily data backup is conducted.

What if we did a full system save (option 21) once a month, and data files backups every day? Would we not be able to recover from a system (disk) failure, barring having any other changes (ptf's, programs, etc.) to the system?
An Option 21 save will execute the following save commands:

SAVSYS

SAVLIB LIB(*NONSYS) ACCPTH(*YES)

SAVDLO DLO(*ALL) FLR(*ANY)

SAV OBJ(('/*') ('/QSYS.LIB' *OMIT) ('/QDLS' *OMIT) +

('/QIBM/ProdData' *OMIT) +

('/QOpenSys/QIBM/ProdData' *OMIT))

UPDHST(*YES)

After you run these commands you will have a complete backup of your system. If you then just backup data files once a day, you won't be backing up the contents of the DLO or IFS file systems. This leaves a big hole in your backup strategy.

At a bare minimum I'd suggest that you do an Option 21 after any upgrade or any PTF maintenance followed by an Option 23 save on a daily basis. It executes the following save commands:

SAVSECDTA

SAVCFG

SAVLIB LIB(*ALLUSR) ACCPTH(*YES)

SAVDLO DLO(*ALL) FLR(*ANY)

SAV OBJ(('/*') ('/QSYS.LIB' *OMIT) ('/QDLS' *OMIT) +

('/QIBM/ProdData' *OMIT) +

('/QOpenSys/QIBM/ProdData' *OMIT))

UPDHST(*YES)

You will need all of this data in order to recover your system. If you don't have time to run these save options, then you will need to come up with a more complicated save strategy that includes backing up changed objects, doing save while active saves, and possibly journaling objects.

Good Luck...

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