Conference cookie::sls

2203.0. "Incorrect Volume pointer in STORAGE SHOW VOLUME" by GIDDAY::CHEUNG ("CSC, Sydney") Thu Feb 27 1997 04:33

Hi,

A customer has a problem with the tape volumes in a volume set that one of the
pointers is bad. One volume set is like this with the following tape volumes:

C10182 - C09706 - C09697 - C09698 - C09708

However, another set started with C01131 points back to C10182. STORAGE SHOW
VOLUME C01131 has the display exactly the same as doing STORAGE SHOW VOLUME
C10182.

$ storage show volume c10182

      Volume:      C10182               Owner:      ULM::NHR_MAINT
      Format:      BACKUP               Brand:
      Allocated:   21-AUG-1995 09:09    Scratch:    17-NOV-1858 00:00
      Purchased:   16-MAY-1995 15:51    Cleaned:    16-MAY-1995 15:51
      Media type:  TA90E                Length:       2400
      Mounts:           4               UIC:        [NHR_MAINT]
      Location:    CABBL5               Protection: S:RW,O:RW,G:R,W:
      Notes:       
      Offsite:                          Onsite:
      IO Errors:        0               Flag:       FREE
      Next volume: C09760               Previous:   *none*
      Pool:        CASSETTE             Rec len: 0  Block factor: 0
      Initialized: 30-JUN-1995 16:04    Density:    COMP
      Slot number:
      Side:                             Other side:
      Jukebox / slot:      /
      Drive:       *ULM::$1$MUA2
      Volume is not in a jukebox.
      Volume is not in a magazinE.

$ storage show volume C01131

      Volume:      C10182               Owner:      ULM::NHR_MAINT
      Format:      BACKUP               Brand:
      Allocated:   21-AUG-1995 09:09    Scratch:    17-NOV-1858 00:00
      Purchased:   16-MAY-1995 15:51    Cleaned:    16-MAY-1995 15:51
      Media type:  TA90E                Length:       2400
      Mounts:           4               UIC:        [NHR_MAINT]
      Location:    CABBL5               Protection: S:RW,O:RW,G:R,W:
      Notes:       
      Offsite:                          Onsite:
      IO Errors:        0               Flag:       FREE
      Next volume: C09760               Previous:   *none*
      Pool:        CASSETTE             Rec len: 0  Block factor: 0
      Initialized: 30-JUN-1995 16:04    Density:    COMP
      Slot number:
      Side:                             Other side:
      Jukebox / slot:      /
      Drive:       *ULM::$1$MUA2
      Volume is not in a jukebox.
      Volume is not in a magazine.
    

Has anyone seen this problem? I guess the TAPEMAST.DAT has been corrupted. I am
still waiting for the customer to send me the display from:

$ STORAGE REPORT VOLUME VOL=*,PREV,NEXT

I found a TIMA article which has a problem description close to this one but
that was for SLS V2.3 (and fixed in V2.4 already) and customer is now running
SLS V2.8 on a OpenVMS VAX V6.1 system.

Thanks in advance for any pointers

Regards,
John, CSC/Sydney

This is expected for volumes in the FREE state.  When volumes are
deallocated, SLS/MDMS does not clear the NEXT/PREVIOUS fields at
that time.  This is done later when the volume is allocated again.  
Note that when you did the STORAGE SHOW VOLUME command, that SLS/MDMS
did not "travel" the volume set list as it does when volumes are
in the ALLOCATED state and show you all members of the set.  This 
is another indication that SLS/MDMS does not view FREE volumes as
members of a set even though there may be a value in the NEXT/PREVIOUS
fields.

Barb