HP OpenVMS Systems

System disk BACKUP suggestions?

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The Question is:

 
What is the best way to backup shadowed system disk without booting?
 
 

The Answer is :

 
  There is no best way, there are only ways that will result in fewer
  corruptions.
 
  If you are asking this question, the OpenVMS Wizard strongly recommends
  the use of Standalone BACKUP (OpenVMS VAX) or of the bootable CD-ROM
  environment (OpenVMS Alpha), or of a spare system disk.  Perform the
  BACKUP only when critical changes are made to the system disk.  Relocate
  all volatile files -- SYSUAF, RIGHTSLIST, etc -- off the system disk, and
  perform on-line BACKUPs of those files more frequently.
 
  You can use BACKUP/IMAGE/IGNORE=INTERLOCK, realizing that /IGNORE=INTERLOCK
  is analogous to the (entirely hypothetical) /ALLOW=DATA_INCONSISTENCIES
  qualifier.  For smaller windows where applications need be quiescent, you
  can potentially remove one of the disks from the shadowset and remount it
  outside the shadowset, using it as the source for BACKUP/IMAGE.  When
  completed, add the volume back into the shadowset and allow shadowing
  to overwrite it.
 
  The supported approach to back up any OpenVMS VAX system disk is via
  standalone BACKUP -- neither online BACKUP of the system disk nor the
  technique of splitting a shadowset in the fashion described here are
  officially supported, and both can lead to potentially inconsistent
  BACKUPs.
 

  

     

     
answer written or last revised on ( 27-MAY-1999 )
     
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