HP OpenVMS Systems

Writing to a shadowset member? (VOLSHDWMEM)

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The Question is:

 
When I try to mount a disk as foreign for backup, I get the following -
$mount /for dka300:
%MOUNT-W-VOLSHDWMEM, mounting a shadow set member volume; volume write
locked
%MOUNT-I-MOUNTED, USERA mounted on _$1$DKA300:
 
The volume is then write locked, so I can't write to it.  I want to backup
data ON to that disk.
Am I doing something wrong ?
Thanks
 

The Answer is :

 
  OpenVMS goes to great lengths to preserve the integrity of your data.
 
  In this case, OpenVMS notices that you are privately mounting a volume
  that used to be a member of a shadow set.  The assumption OpenVMS then
  makes is that the integrity of the shadow set must be maintained, and
  so it will not permit writing to the volume while it is not part of the
  original shadow set.  This is because writes to the volume will probably
  destroy the integrity of the shadow set, and this may not be what you
  want.
 
  So, the question becomes, what *do* you want?  Do you want to add more
  data to this volume, and have it still be part of the original shadow
  set?  Or do you now consider this a scratch volume, and want to use it
  for another purpose?
 
  If the former, you must mount the volume back into its original shadow
  set, and do your writes to the shadow set virtual unit.
 
  If the latter, you must re-initialize the volume.  This will turn the
  volume back into an ordinary disk volume, and you may then mount it and
  write to it.  You will, however, lose any data that is already stored on
  the volume.  If you want preserve this data, then you must copy it
  somewhere, re-initialize the volume, copy the data back, and then you
  can use the volume as an ordinary disk volume.
 

  

     

     
answer written or last revised on ( 15-NOV-1999 )
     
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