>>> On 8/28/2009 at 4:06 PM, Tom Rae <tom_...@shaw.ca> wrote: -snip- > One of the customers that I support is using vCTCAs to connect multiple > z/VSE and Linux guests to their z/VM TCP/IP and SNA SVMs. External > connections are provided by QDIO and non-QDIO OSA-Express2 devices (both > Gb and 1000Base-T) that are attached to the SVMs. We are looking at > providing more efficient, direct network access to the guests by > defining additional devices on the OSAs and attaching them directly to > the guests.
Why not use a VSWITCH instead? Far less systems programmer effort needed to maintain, automatic failover is provided by the VSWITCH controller, you can do Link Aggregation if needed, etc. -snip- > I have been unable to determine what, if any, addressing > requirements and restrictions will apply to the additional OSA devices, > other than that QDIO read/write devices and TCP/IP passthru devices must > be sequential even/odd pairs This is no longer true. The only requirement is that the read/write devices numbers have to be sequential. > and that all of the new devices must be in > the xx03-xxFD range. I have never heard of this before. Unless you're saying that 00-02 and 0FE-0FF are already in use, but that would be specific to your situation, not a generic requirement. -snip- > - Do the QDIO datapath devices have to have addresses that sequentially > follow the corresponding QDIO read/write device addresses? No. > - If the QDIO datapath addresses do not have to sequentially follow the > read/write device addresses, are there any other > restrictions/requirements for QDIO datapath addressing? Other than being on the same CHPID, no. > - Do the non-QDIO SNA device addresses have to be even? This one I can't answer. Mark Post
