[Info-vax] INIT/SHADOW

[Phillip Helbig---undress to reply]

Is there any point at all in using INIT/SHADOW without /ERASE or without 
having done INIT/ERASE on the individual members first?

I can understand that, although the erase takes time, when the shadow 
set (containing no data, of course) is formed, then it is quicker since 
no time is needed for the merge.  But how does the shadow set KNOW that 
no merge is necessary?

Suppose I have two identical disks (say, BACKUP/IMAGE from a third disk) 
and mount them into a new shadow set.  Presumably, in this case a merge 
would take place, even though it is not necessary.

Would it make any difference if the third (source) disk was previously 
part of a shadow set or not?