Hi, 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. Brian ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
