Extended Backup Times for NONSYS

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Backup and Recovery
Currently running V5R3 For some reason backup times on our production machine for the NONSYS have suddenly increased from approx 5hours to 7hours (Approx 500gb) There has been no appreciable gain in disk space used and exactly the same drive is being used (3592). Can anyone give me some suggestions as to why this might be happening? There are no obvious problems with the backups after checking through the joblogs. Thanks very much for an suggestions.

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Hi,
With nonsys you mean userdata? i’m not sure. is there a problem with the tapedrive, for instance the microcode on it? IBM can help you with that. is there maybe a job running during the backup that allocates the data, so that the backup has to wait? do you clean the tapedrive regularly with a cleaningtape?
pls let me know if this helps

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  • johnknight
    Has there been Logical files created over large Physical files around the time whent the backup time increased? Did the job change to save access path = *yes?
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  • Neilm1m
    Thanks for you comments. *NONSYS = All libraries except the system libraries are saved. Tape drives are up to date with microcode and as this is effecting more than one drive I don't believe this is due to the drives themselves. Also they are cleaned on a regular basis. No logicals have been created (to my knowledge) and the access paths are set to *no. Any other thoughts?
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  • johnknight
    Next question is have your memory pools changed or is there a large batch job now running using the same pool as the backup job?
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  • Neilm1m
    I'm afraid not. Save is run in restricted state so there is no change to memory and no jobs running on the system at the same time as the save. Thanks.
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  • Mbelle
    I was wondering if you have looked in SST to see the tape statistics? At V5R3 in SST there is an option to "Work with Removable media session statistics" This will show if you are starting to get excessive reads or writes during your saves.
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  • Dkb073
    Has there been any changes to any of the save parameters (ie. compression, compaction, optimum block)?
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  • Neilm1m
    Didn't realise that you could check the statistics there, but.... no joy. One or two tapes with a few errors but nothing really significant. As it is, the drives are only approx 4/5 months old anyhow. And no, no changes to any parameters at all.
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  • LSTEVENS
    We had a problem in V5R2 with long backup times after an IPL. IBM said it was 'cos "first touch" adds to the processing time. Our times got better as the week went on. Also, not all tape drives log stats to the SST media stats. We have a VXA2 drive and it doesn't.
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