Thanks to your excellent interpretation of the trace, the vendor has re-examined their microcode and found where they were indeed causing the UC. They are working on a fix. (And they once told me that the TRSOURCE and console were not useful in solving this problem. Out of nothing comes something.)
Regards, Richard Schuh > -----Original Message----- > From: The IBM z/VM Operating System > [mailto:[EMAIL PROTECTED] On Behalf Of Alan Altmark > Sent: Wednesday, July 23, 2008 9:52 AM > To: IBMVM@LISTSERV.UARK.EDU > Subject: Re: Interpreting Trace > > On Wednesday, 07/23/2008 at 11:47 EDT, Rob van der Heij > <[EMAIL PROTECTED]> wrote: > > > But Sir Mike! The modern 3480 cartridge does not do shiny bits > > anymore. After all, the cartridge is closed so there is no > light that > > will go in to shine ;-) The control unit is smart enough > to count the > > operations that move the tape, and indeed... virtualizes BOT. > > The drive doesn't have to count operations. The drive knows > where BOT and EOT are at all times because of block numbers > and other information encoded on the servo track. (The > presence of the servo track is why you must not degauss a > cartridge tape.) > > Alan Altmark > z/VM Development > IBM Endicott >
