Greetings,
I have cross-posted this to the z/VM and z/VSE lists - sorry for the
inbox clutter to those of you that subscribe to both! The following
questions do not relate directly to z/VM or z/VSE, but since I am
dealing with a z/VM system with multiple z/VSE guests I figured that I
would start here...
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.
There are currently four devices defined on each of the OSA CHPIDs:
xx00-02 and xxFE for those running QDIO and xx00-01 (TCP/IP passthru),
xx02 (SNA), and xxFE for non-QDIO. Our preliminary design takes into
account the number of TCP/IP stacks and addresses supported by each OSA
port, but after reading through all of the applicable manuals and
redbooks 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 and that all of the new devices must be in
the xx03-xxFD range.
Questions:
- Do the QDIO datapath devices have to have addresses that sequentially
follow the corresponding QDIO read/write device addresses?
- 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?
- Do the non-QDIO SNA device addresses have to be even?
Thanks in advance,
Tom
