Thanks Alan I didn't know if some sort of "interrupt" came back from the device that notified CP that a FlashCopy was taking place.
I haven't got that far in flashcopy, but I am under the assumption that if you need to flashcopy a series of volumes at the same "instant" in time, I can't do it from VM, as each volume takes an individual flashcopy command. Hence the first volumes "flash" is started several seconds before the last volumes "flash". The web interface of bundling a series of flashs together, seem to indicate all volumes will be flashed at the same instant. But I do recall something about I can set up a flash, using DSF to do....something... But I haven't needed to get to that point yet. Tom Duerbusch THD Consulting >>> [EMAIL PROTECTED] 12/6/2005 9:26 AM >>> 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
