Brian Westerman wrote:
The emulated DASD has a "BASE" dasd image, and can have one or more "SHADOW" images of the same volumes. All changes made to the dasd occur in the shadow image, thus leaving the base dasd unchanged. You can select to merge the shadow image into the base, (thus making a new base) or deleting the shadow image, thus throwing away all of the changes to that volume at any time. It's a cool way to handle things, and it's not that much different than on a "regular" mainframe when you work with an Iceberg or some other similar device where you can accomplish the same "type" of operations. It makes backing up the dasd very quick as well since you only have to backup the shadow images (assuming you have copies of the base already), which is sort of like instant incremental backups.
Are you talking about something specific to Flex/ES? In an earlier post, you mentioned the ADCD pre-packaged system from IBM. How is that relevant? Does IBM provide some specialized software support for Flex/ES, available with ADCD, that isn't available on "ordinary" systems?
Can you kindly provide a URL to any documentation or other information that would help me understand what it is you're talking about?
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