> I have one z9 foot-print with two books. In one I run one zVM1 (CP1) > and on the sencond, I run zVM2 (CP2). Under each zVM I run Linux > guest servers. The fail-over for a given Linux guest is on the > opposite zVM. > > My question, how should I set up the life-line between the fail-over > linux guests? > do I need to go hypersockets, regular LAN, etc?
Either real hipersocket (completely inside the box, no external traffic required) or a VLAN-aware VSWITCH with external devices handling network HSRP. The plus side of the hipersocket is that as long as the mainframe hardware is functioning at all, you can rely on it being there, and outside the scope of random network meltdowns outside the box. Disadvantage is the complexity of setup and that there are a limited number of real hipersockets in the box, and the IO gens to use them are not trivial. You also don't want to mix traffic from other things on the same segment as your heartbeat processes; some heartbeat monitors get a little hyperactive if they see excessive traffic. The downside is that physical hipersockets arent' extendable to another box. The plus of a VLAN aware VSWITCH is that all the network redundancy processing can be moved to outboard equipment, and you can have the routers do all the failover processing and monitoring. This is much more familiar to your average networking type, and is more likely to pass your architecture board without irritating explanations. Since VLANs can be routed across existing layer 2 infrastructure, you get the ability to eventually separate the two LPARs w/o changing the setup, and if there are encryption requirements, you can implement them in the external boxes w/o impacting resource utilization on the mainframe side. If it were me, I'd probably go with the VSWITCH. Heartbeat packets really don't exploit the best parts of real hipersockets (high volume bulk data transfer) much, and the ability to separate stuff easily later is a big architectural win in my book. ---------------------------------------------------------------------- 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
