On Thursday, 04/05/2007 at 10:15 EST, RPN01 <[EMAIL PROTECTED]> wrote: > What can anyone out there tell me about ³Globally Dispersed Parallel > Sysplex² for zOS, and zVM sharing DASD with that environment? The zOS team > here is actively looking at it (I¹m in the meeting w/ IBM right now), but by > the sounds of it, zVM is totally screwed; If something causes zOS to > hiperswap, (like a quarterly test of the procedure) zVM is either left > standing on DASD running unmirrored, or just crashes because it can no > longer access any DASD at all. > > Is anyone running in this environment? If so, what are the implications to > zVM? I really don¹t have a ³comfortable feeling² about this at all. It > doesn¹t seem like a well thought-out product, if it won¹t support all of > IBM¹s environment...
You should take this up with the IBM Services folks who set this up, but it sounds like some componentry is missing or misconfigured. Tivoli System Automation (TSA) on z/OS has to be able to talk to TSA Linux running on z/VM. If GDPS triggers and entire CEC failover, including z/VM, it doesn't really matter except that GDPS will (must) shutdown the local VM LPAR, break the mirroring, reestablish the mirror in the reverse direction, and IPL the other VM LPAR (using an alternate SYSTEM CONFIG). Et voila. If it just a DASD failover, TSA on z/OS will talk to TSA Linux to issue CP HIPERSWAP commands to stop CP I/O, break the mirror, and resume I/O on the mirrored volumes. In this environment, TSA Linux also can handle non-GDPS-orchestrated dasd failover, detecting I/O failure locally, stopping CP I/O, telling GDPS (via TSA) to break the mirror, and restarting CP I/O. But all of this depends on an exact set of operations occuring in a specific order and in a certain time interval. The Services folks should be able to resolve the problem. Alan Altmark z/VM Development IBM Endicott ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
