Cross posting to Linux for s390 and z/VM List Serves
We are looking at using a SAN and connect our z/VM system to it to allow our Linux servers on z/VM to use it We are having questions on Connectivity in the IOCP to backend LUN's in the SAN For FCP Channels you are not allowed to do Multi-Pathing like we normally see on the Mainframe by having a control unit have multiple Path to the same device. If this is correct then two SAN switch's that connect to the SAN disks can map to the same LUN in the back end Using this will allow 2 separate device addresses to be created that point to the same backend LUN correct? Then Linux Multi-pathing will see 2 separate device addresses as a single LUN and associate both addresses to the same SAN Device CHPID 40 (CSS0) -----> Switch A -----> ---------------------- | SAN Devices | CHPID 41 (CSS0) -----> Switch B -----> ---------------------- CHPID 40, CU 4000, devices 4000-401F CHPID 41, CU 4100, devices 4100-411F If the Zone Fabric relates all the out link switch ports to the same xx00-xx1F devices in the backend, does this allow for Linux Multi-pathing and eliminate the single CHPID point of failure Are there any documents that will clarify this possibly for me? Larry Davis Senior z/VM Systems Architect, Leveraged Mainframe Team DXC Technology T +1.813.394.4240 larry.dav...@dxc.com<mailto:larry.dav...@dxc.com> ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www2.marist.edu/htbin/wlvindex?LINUX-390