I was told that IBM recommends for p/Series platform software mirroring
over hardware based remote copy (like PPRC).
Q1. Is it true ?
Q2. What are the advanages of using OS features over remote copy
solutions provided by DASD hardware ?
I was told, that OS mechanisms provide 'seamless' failover (switching
from one DASD to another), consistency groups and concurrent reading
from both DASD (better cache utilization). Also, path failover feature
is built in AIX.
I wonder why there is such advantage of OS-based DR-solutions, while
mainframes usually rely on DASD HW-based remote copy functions.
The above is more or less similar to MVS dual copy. Why IBM didn't
develop this technique on z/OS ?
--
Radoslaw Skorupka
Lodz, Poland
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