Thanks to all who have replied.  Let me explain what I had envisioned.  I a mentioned DS8100, but it could be a DS8000.  I'm looking for the capability for
a local DASD subsystem to mirrored off site to the same type of DASD subsystem  and  that it be done concurrently.  The idea is that this "mirroring" is
going on 24/7 and should the main site get hit with a disaster, the off site DASD subsystem would be current up to the point in time of the disaster.
I would prefer the two DASD subsystems manage this "mirroring"( or what ever you want to call it) by themselves.  That is, no operating system, z/VM, VSE or
z/OS has to do it.  It seems to me the o/s has better things to do then doing this "mirroring" function, but if it must, it must.
Is there such a solution?
Thanks again,
Steve

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