Ouch..... ____________________ Jim Hughes 603-271-5586 "It is fun to do the impossible."
==>-----Original Message----- ==>From: The IBM z/VM Operating System [mailto:ib...@listserv.uark.edu] On ==>Behalf Of Schuh, Richard ==>Sent: Wednesday, June 17, 2009 3:37 PM ==>To: IBMVM@LISTSERV.UARK.EDU ==>Subject: Re: Trace I/O for a 3490 tape drive ==> ==>You have IPLed DDRXA. It probably is running with interrupts disabled and ==>is using TSCH to determine the status of its I/O. If that is so, all you ==>will see will be the SSCH and TSCH instructions. It is most likely that ==>stand-alone utilities do not want to be distracted by I/O interrupts from ==>extraneous devices, so they may well run with I/O interrupts disabled. It ==>is also likely that they do not want the complexity of having first and ==>second level interrupt handlers, so they use the TSCH loops as Alan ==>suggested. ==> ==>Your trace results are undoubtedly correct and correct. ==> ==> ==>Regards, ==>Richard Schuh ==> ==> ==> ==>> -----Original Message----- ==>> From: The IBM z/VM Operating System ==>> [mailto:ib...@listserv.uark.edu] On Behalf Of Alan Altmark ==>> Sent: Wednesday, June 17, 2009 11:25 AM ==>> To: IBMVM@LISTSERV.UARK.EDU ==>> Subject: Re: Trace I/O for a 3490 tape drive ==>> ==>> On Wednesday, 06/17/2009 at 12:58 EDT, "Hughes, Jim" ==>> <jim.hug...@doit.nh.gov> wrote: ==>> > I?d like to trace all i/o, interrupts, etc for a 3490 tape drive. ==>> ... ==>> > My trace command is: ==>> > CP TRACE IO 181 CCW INS INT BOTH RUN ==>> > ==>> > I?ve used various other combinations of TRACE SIO and TRACE ==>> SSSCH and ==>> etc? ==>> > with no happiness. ==>> > ==>> > I can get the TSCH and SSCH commands to appear and nothing else. ==>> > ==>> > What can I do to get ALL the tape i/o for address 181 to show up? ==>> ==>> What other I/O were you expecting? If the guest is in a TSCH ==>> loop, it typically won't get I/O interrupts. They will be ==>> drained by the TSCH. ==>> ==>> Alan Altmark ==>> z/VM Development ==>> IBM Endicott ==>>
