On Mon, 2 Jun 2008 12:22:47 -0700, Schuh, Richard <[EMAIL PROTECTED]> wrote :
>We have some devices from a vendor that are not tape drives, but which >respond to Sense Id and Read Device Characteristics as though they are >3480-04s. This works fine for the older model of the device; however, >the newer versions respond very badly to any legitimate tape command >that is not included in a list of 5 CCW Op codes that they need. >Unfortunately, Rewind and Unload is not a supported command. Because of >this, CP gets a CE/DE/UC with Command Reject whenever one of these >devices is detached from a user or a user logs off. This is not a good >thing because it boxes the device. > >I can include RDEVICE statements in SYSTEM CONFIG to perhaps eliminate >the RUN problem. My question is, what can I specify that will work? I >can specify TYPE TAPE. Another possibility is TYPE UNSUPPORTED with >DEVCLASS TAPE. Will CP still issue the RUN command for these devices if >I include either of these potential circumventions? I would be surprised >if it did not. Is there a generic type and class I can use without fear >of introducing other problems? It probably would not be much of a change >to HCPDTD to bypass the RUN for an address range; however, something is >needed sooner rather than later. > >I have expressed an opinion to the vendor that if a device is going to >tell the system that it is a 3480-04, then it ought not reject CCWs that >are legitimate for that type of device. It will probably be faster for >me to modify CP than for them to modify their devices. > >Regards, >Richard Schuh I would go with TYPE UNSUPPORTED with DEVCLASS TAPE. I doubt CP will iss ue anything. (You or IBM will need to read the code.) IBM support came up with a revised CCW t able for us for an UNSUPPORTED device (a channel extender) that didn't like one of the CCWs. We carry this as a user mod. Alan Ackerman Alan (dot) Ackerman (at) Bank of America (dot) com
