On Tuesday, 07/17/2012 at 11:34 EDT, "Norris, Chet" <chester.m.norri...@marriott.com> wrote: > It sounds like Alan's "HiperSocket VSWITCH Bridge" could be an option, but > multiple people (including Alan) have recommended using direct Hipersocket > device definitions for each zLinux user.
Perhaps there is a misunderstanding. I have no objection to real HiperSockets for backups (or any other reason) as long as you realize that HiperSockets consume z CPU cycles since it is the CPU that moves the data, not the IOPs. > If I make it simple and define unique devices to each user, how do I fail over > to a different device if MVS moves to another machine? I'm also going to be > limited as to the number of zLinux users on any given CHPID, or is that number > high enough that its not an issue? I should have been paying closer attention. The HiperSocket VSWITCH bridge is specifically designed to give you the performance benefit of real HiperSockets when the target is in a neighboring LPAR, but the flexibility to transparently use ethernets when the target is elsewhere. There's no longer any need to configure a secondary paths in order to accommodate the ripping noise you hear when HiperSockets partners are torn out of the CEC (e.g. DR or failover configs). BUT, the bridge only works with MVS when the bridge is configured to use the IEDN in a zEnterprise ensemble (OSX chpids). For non-ensemble configurations (OSD chpids), z/OS drives the HiperSocket in a way that prevents use of the bridge. Also, be aware that the bridge is available only on a z196 or z114 with z/VM 6.2. Across all HiperSocket chpids, you have have 12K unit addresses. Since each host/guest uses 3 UAs, you can have up to 4096 hosts using HiperSockets on the CEC. Alan Altmark Senior Managing z/VM and Linux Consultant IBM System Lab Services and Training ibm.com/systems/services/labservices office: 607.429.3323 mobile; 607.321.7556 alan_altm...@us.ibm.com IBM Endicott ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/
