Re: Best way (Fastest) to run

[PaulMmn <PaulMmn@xxxxxxxxxxxxx>]

>We do our weekly backup disk to disk via *SAVF.  We've played around a
>couple of different ways to try and speed this up.  We currently save 30
>libraries each of which is initiated through a submit job to a jobq with
>MAXACT=*NOMAX.  This is taking about 57 minutes.  We had been doing submit
>job to a jobq set at MAXACT=3 for some of the larger libraries and
>submitting the smaller ones to a jobq set at *NOMAX.  In this case it ran
>about 60 minutes.
>
>Is there a way/method I could use to speed these up.



We used to use a backup that would either save to tape or to save files.
If the save was to save files, it would automatically submit jobs to copy
the save files to tape the following morning.

We stopped using this procedure when we found we didn't have enough disk
space to duplicate our production envoronment.

WHAT WE DID:

We created source files to contain lists of libraries to be saved.

The first job added all of the library names to a data queue.

        Ask the operator how many SAVE jobs to run
        Ask the operator if tape or SAVF is to be used

        Submit the proper number of Save jobs to a job queue that can run
that many jobs at once.

The Save jobs read the next available library from the data queue, and save
it to either tape or SAVF.  Submit a job (on hold) to copy the save file to
tape.  The Save jobs continue saving the next library on the data queue
until they're all saved.



This procedure handled our backups for several years.

The advantage of this procedure was that a single long-running backup
wouldn't hold up other backups.   The only problem we had was if we had too
many big libraries. They'd clog all of the backup slots.  We balanced the
load by splitting the Bigs and the Littles into separate backups so all of
the backups ended about the same time.

--Paul E Musselman
PaulMmn@ix.netcom.com


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