Topic
1 reply Latest Post - ‏2011-02-09T14:53:12Z by QSECOFR
Pharthiphan
Pharthiphan
1 Post
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Pinned topic Restoration using native operating system backup command took 10 hr for 300

‏2011-02-09T05:24:23Z |
Hi,

Restoration using native operating system backup command took 10 hr for 300GB,while backup done in 1 half hr.

PFA

how to improve the performance for the tape drive?
Updated on 2011-02-09T14:53:12Z at 2011-02-09T14:53:12Z by QSECOFR
  • QSECOFR
    QSECOFR
    55 Posts
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    Re: Restoration using native operating system backup command took 10 hr for 300

    ‏2011-02-09T14:53:12Z  in response to Pharthiphan
    A restore operation normally takes anywhere from 1-2 times as long as the save. Performance issues can sometimes be simple or extremely complex.

    These are what determine the speed of the restore:
    • Tape device
    • Tape device firmware
    • Connection type (scsi/fibre)
    • Fibre switch config/traffic
    • IOA speed
    • IOP
    • Bus
    • System i and component microcode (PTFs)
    • Save/restore command and parameter values such as only restoring new members, access path rebuild, ASP etc.
    • Memory pool
    • DASD disk response
    • processor (not usually processor)
    • media type
    • media recoverable errors
    • etc...
    Knowledgebase document 18704246 is an excellent document with the average speeds for tape devices and IOAs. http://www-912.ibm.com/s_dir/slkbase.NSF/DocNumber/18704246

    1) What was the save command/parameter values?
    2) What is the restore command/parameter values?
    3) What type of tape library/drive and media is used?
    4) Any Product Activity Log entries or WRKPRB entries?
    5) Media Session statistics will give any gaps in time and any media errors
    6) If V6R1 or above, /QSR/QSR/fr and fr.old are the save/restore flight recorders
    7) Any errors in the joblog (at higher releases, I believe it gives the timestamps and blocks restored)
    8) Restoring to same system with same drive or different?

    If you have a support contract, it would probably be best to contact your support.

    • Brian