If nothing is returned from VMBEXIT4, CA VM:Backup uses the original link mode. If the link mode is changed, the user exit must pass back a character string with one or two characters specified: W, M, WR, MR, MW, EW, SW, or SM. For example, to code the user exit to return a link mode of mult, the following can be done from REXX:
linkmode = 'M' return linkmode
If the user exit returns an invalid link mode, CA VM:Backup skips the minidisk. Any link returned by the user exit containing blanks is considered by CA VM:Backup to be an invalid link.
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