On Mon, 23 Apr 2007 20:37:29 +1000, Shane <[EMAIL PROTECTED]> wrote: >On Mon, 2007-04-23 at 04:15 -0500, R.S. wrote: > >> The message regards tape device. >> How to find out what system holds the device ? >> (except from checking it on every system console) > >And to (partially) answer the question ... >When we have seen this, we weren't able to ascertain the holding system >(from the victim). *Very* disconcerting when it's a system outside of >the 'plex - that isn't even supposed to be activated. >Especially when the 'plex has tape sharing and the rogue system doesn't. >Scott will have the definitive answer - should he be disposed to stir. > >Shane ...
No good answers, just some background information. When an ASSIGN fails, the function that attempted the ASSIGN (either device allocation or, as in this case, VARY ONLINE) _could_ issue a follow-up command to the device to determine "who" has it assigned. As you can surmise, these functions currently don't do that. There is a difference in processing for VARY ONLINE for a tape device, depending on the autoswitch status of the device. If the device is autoswitchable, then the ASSIGN is not needed to bring the device online, so I believe it is bypassed. For autoswitchable devices, the ASSIGN is obtained when the device is allocated. If the device is dedicated (not autoswitchable), then the ASSIGN is obtained and held for the entire time the device remains ONLINE. It would seem to be a reasonable requirement to have the system do some interrogation of the device when the ASSIGN is 'unexpectedly held'. Scott Fagen z/OS Core Technology Design IBM Poughkeepsie ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
