On Monday, 12/05/2005 at 11:36 CST, Tom Duerbusch <[EMAIL PROTECTED]> wrote: > I have been using flashcopy for some interm backups that I restore from, > also using flashcopy. > > So, if I have been using device 150, and I do a flashcopy from 1150 to > 150, what happens to the MDC contents for 150?
If you use the CP FLASHCOPY command or a guest initiates a "virtual" flashcopy I/O, CP will handle the cache. If you go behind CP's back to do the flashcopy from the disk controller console then you are in trouble. The controller does not notify the host of "background" activity on a volume and the cache will not be valid. So, if you use the controller console be sure to SET MDC FLUSH <vdev> before you start reading/writing the minidisk again. Obviously it is far better to initiate a flashcopy from CP. Alan Altmark z/VM Development IBM Endicott
