I actually have to have a bunch of devices in the Ignored list. It is forbidden that MVS disks, except for a special few used by the TPF developers, ever be allowed online to the VM system. There are more that are ignored (4300+) than the total (1600 not counting TPF database disks, 3700 counting them) of online and offline disks.
Regards, Richard Schuh (And you can be pretty darn big when it comes to integrity and security. I forgot the smiley in the previous post.) > -----Original Message----- > From: The IBM z/VM Operating System > [mailto:ib...@listserv.uark.edu] On Behalf Of Alan Altmark > Sent: Wednesday, September 02, 2009 1:56 PM > To: IBMVM@LISTSERV.UARK.EDU > Subject: Re: Download Vm Tape > > On Wednesday, 09/02/2009 at 04:24 EDT, Adam Thornton > <athorn...@sinenomine.net> wrote: > > On Sep 2, 2009, at 3:13 PM, Schuh, Richard wrote: > > > > > I think it goes more to separating production from installation/ > > > maintenance. It the volsers are different, changing > something on the > > > system must be deliberate. Accidental update is very > difficult. Alan > > > is big on data integrity, well ... as big as he can be. > > > > But....unless you're installing your second-level systems > on dedicated > > devices, would you ever have duplicate volsers? And, uh, why would > > you install second-level like that unless you really, > really meant it? > > Richard has the right of it. Within the domain of "all > online dasd" you have a system and data integrity obligation > to ensure that CP does not use the wrong dasd volumes at IPL time. > > Rule #48: Never have duplicate volids "online" during IPL. > Period. No exceptions. > > If you have a set of backup system volumes with the same > labels, make sure each has a SYSTEM CONFIG that has the > "other" set of system volumes OFFLINE_AT_IPL. > > If you have "alien" volumes in your LPAR, make sure they, > too, are OFFLINE_AT_IPL. > > Personally, I like OFFLINE_AT_IPL 0000-FFFF and then > ONLINE_AT_IPL only those represented within SYSTEM CONFIG. > Bring the remainder online in > AUTOLOG1 before you start bringing up guests with dedicated > dasd or DEVNO minidisks. > > Alan Altmark > z/VM Development > IBM Endicott >
