Mike,
This is Alan's co-worker. This happened several years ago, so I could
be fuzzy on the details.
In our case, the devices were check sorters, not tape drives. They were
bus-and-tag devices that should have been on a converted channel.
Someone was trying to save channels, so they were on an ESCON channel
with some other devices. The code that ran the sorters was issuing a
CCW that wasn't valid for an ESCON channel, so VM was rejecting it. The
correct solution would have been to put the devices on their own
channel, and define the channel as a converted channel in IOCP. That
would have cost money, so we changed the CCW table instead. IBM was
very generous in helping us with something that wasn't really their
problem.
Dennis O'Brien
"Don't worry about biting off more than you can chew. Your mouth is
bigger than you think." -- CVW-11 chaplain, "Carrier"
-----Original Message-----
From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] On
Behalf Of Mike Rydberg
Sent: Monday, June 09, 2008 08:49
To: IBMVM@LISTSERV.UARK.EDU
Subject: Re: [IBMVM] Unsupported Devices
Alan,
If your channel extender is a CNT/McDATA/Brocade product doing ESCON or
FICON extension, I am curious which tape device model you have and which
CCW's were not supported.
Regards,
Mike Rydberg
Brocade Communications
>-----Original Message-----
>From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] On
>Behalf Of Schuh, Richard
>Sent: Monday, June 09, 2008 10:09 AM
>To: IBMVM@LISTSERV.UARK.EDU
>Subject: Re: Unsupported Devices
>Thanks, Alan. We may need that mod too. We are getting ready to extend
>our channels, but aren't quite there yet.
>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
>
