On Monday, 05/08/2006 at 04:20 GMT, Paul Raulerson <[EMAIL PROTECTED]> wrote:
> I modified the IODC (using the HMC, I have not figured out how to use the z/VM > software for doing so yet... :) to change a free FC channel to a FCP channel, > and added a CUNUMBR line to support. I?ve included the definition file below, > with the interesting bits marked in red.:) > > From z/VM I can do a query on the CHPID (F3 in this case) and I see that it > thinks there are devices available out there. That is kind strange, because the > new tapes are not yet attached there are two new 3592 TS1120 tape drives ready > to connect to the SAN switch and configure. The FiCON port is also ready to > connect to the SAN switch and, if necessary, do any configuration. Actually, VM doesn't see the SCSI devices. What it sees are the subchannels on the chpid. In normal ESCON attachment, the control units actively participate in the I/O process. They know which devices are available and which devices are not. For SCSI, there is no traditional control unit to manage device attachment to the I/O subsystem. There's just a cable the plugs into your FC switch. The connection to a particular drive is established dynamically via a specific protocol between the guest or CP and the switch. So as long as the chpid is active, all of the devices you defined on the chpid will appear, but they don't have active devices on them until CP (via EDEVICE) or a guest (via its own SCSI device drivers) does something. > Problem is, from this point on I am lost there are WorldWidePort addresses and > a lot of other terminology I am not familiar with. So any references or > pointers would be very much appreciated. I have a feeling that this is not all > that hard. The Shark is current attached to the same SAN switches, and provides > DASD for the PC?s. See Steve Wilkins' home page: http://www.vm.ibm.com/devpages/wilkinss where you will find several of his presentations on z/VM and SCSI. These are excellent resources. (Steve is the Father of z/VM SCSI.) It helps if you can sit down with someone who has storage expertise to help round out some of the practical considerations. And get thee to a VM user group near thee! If the user group requests someone come and speak on SCSI, we are more than happy to oblige. Alan Altmark z/VM Development IBM Endicott
