  Volume Shadowing, Mirroring, and Merges? 
 The Question is:
 
Pros and Cons of Shadowing vs Mirroring. We currently use Shadowing
on our cluster. The merge operations after a problem are killing us for
up to 18 hours due to the size of some Database Stripe sets. Would
"Mirroring" work any different after a problem?
 
Thanks,
 
John Palmer
The Sabre Group
 
 The Answer is:
 
  OpenVMS typically considers Volume Shadowing to be the same as
  Disk Mirroring -- two names for the same operation.
 
  Information on the particular problems around the merge and around
  the event triggering the merge will be of interest -- please contact
  the Compaq Customer Support Center for assistance.
 
  The OpenVMS Wizard would recommend loading the current ECO kit
  for shadowing as a first step, and considering various software-
  and hardware-based options based on the assumption that host-based
  volume shadowing is presently in use.
