Generally, users and applications access a shadow set throughthe virtual unit. Occasionally, you may want to change the dataon an individual shadow set member and then pass the changed datato other shadow set members.
The following series of commands demonstrates how you candissolve and recreate the shadow set to perform specialized processeson one shadow set member and transfer the change to the other shadowset members.
The following command mounts a shadow set with three shadowset members:
$ MOUNT DSA9:/SHADOW=($45$DUA2:,$45$DUA4:,$45$DUA8:) MAX1
The following command dissolves the shadow set mounted inthe previous command and makes the individual shadow set membersavailable:
$ DISMOUNT DSA9:
The following command mounts one former shadow set memberas a disk volume outside of the shadow set:
$ MOUNT/OVERRIDE=SHADOW_MEMBERSHIP $45$DUA2: MAX1
In this command, in order to have write access, you must usethe /OVERRIDE=SHADOW_MEMBERSHIP qualifier to zero the shadow setgeneration number. At this point, the disk is mounted as a nonshadowed volumeand can be modified as required.
Before creating a new shadow set, dismount the $45$DUA2 physicaldisk, as follows:
$ DISMOUNT/NOUNLOAD $45$DUA2 $ MOUNT DSA9:/SHADOW=$45$DUA2: MAX1
The second command recreates the shadow set with $45$DUA2as the only member.
Note that mounting $45$DUA2 with the /OVERRIDE=SHADOW_MEMBERSHIPqualifier automatically zeroed the volume shadowing generation number.If you were to specify all the former membersof the shadow set in the same command line, the MOUNT command wouldconsider $45$DUA2 an unrelated volume and would determine that itrequires a copy operation. This would overwrite the earlier modifications.
To save the current contents of $45$DUA2, add the other twoformer shadow set members to the new shadow set with a subsequentMOUNT command:
$ MOUNT DSA9:/SHADOW=($45$DUA4:,$45$DUA8:) MAX1
In this command, $45$DUA4 and $45$DUA8 are added to the shadowset DSA9. This recreates the original shadow set, except that eachshadow set member now has the benefit of the changed data that wasdone to the single shadow set member.
HP Volume Shadowing for OpenVMS
Performing System Management Tasks on Shadowed... 
