Hi Skip, One possible option for the survivability of a 24x7 z/OS environment would be to place the Primary DASD Control Unit(s) at a different site ( a 3rd site ) from the Mainframe CEC's. Then, if one or the other Mainframe CEC "glass house" is unusable, the other ( in theory ) continues to operate. Also, if you happen to be really lucky, the site for the Primary DASD Control Unit (s) would be at or near "half way" between the 2 Mainframe CEC sites. Take that another step further and place standalone Coupling Facilities at that 3rd site as well.
Of course, the Primary DASD Control Unit(s) are still a single point of failure. So, extend this "design" to a 4th site and place duplicate DASD Control Unit(s) at that 4th site. This is where GDPS/Hyperswap would provide near immediate "switchover" from one DASD site to the other. This is just one possible option. Glenn ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
