I've accidentally shutdown the main production system "once", as has every
systems programmer with whom I worked or who worked for me has done. Only once
tho. There are or were couple of gotcha's introduced by IBM. One is the fact
that the official way to stop RSCS is with the SHUTDOWN command. This note of
caution is now in the RSCS SHUTDOWN HELP:
Use care when entering the SHUTDOWN command. If you accidentally enter it
without the appropriate RSCS prefix, it is treated as a CP command and
passed to CP for processing. If you have the proper CP privilege class,
this command would stop your z/VM operating system.
One other place or thing where SHUTDOWN is or was used is the old,old PC3270 or
maybe that was the 3270PC. It was a late 80's PC/XT that came out of Kingston,
I think, rather than Boca. To park the hard disk so the cleaning people
wouldn't bump the stand it was on, you issued a SHUTDOWN command. One of the
sysprogs I workied with SHUTDOWN VM rather than her PC. The next day there was
a SHUTDOWN EXEC on the y-disk that asked you if you "really wanted to do that".
Jim
________________________________________
From: The IBM z/VM Operating System [ib...@listserv.uark.edu] On Behalf Of Rich
Greenberg [ric...@panix.com]
Sent: Thursday, February 04, 2010 4:59 PM
To: IBMVM@LISTSERV.UARK.EDU
Subject: Re: Hi everybody
On: Thu, Feb 04, 2010 at 10:44:34AM -0800,Schuh, Richard Wrote:
} It isn't a matter of trust, it is a matter of minimizing the risk of an
accidental SHUTDOWN. Here MAINT does not have class A; however it does have
class C. That allows it to use the SET PRIV * +A in order to issue class A
commands such as Q CPDISKS, CPRELEASE and CPACCESS. By requiring that extra
step of the SET PRIV, it heightens the awareness of the person to the fact that
they now have extraordinary capabilities and responsibilities.
Rich has hit the nail directly on the head here. Accidents and
mistreaks happen, this just puts another door in front of them.
--
Rich Greenberg N Ft Myers, FL, USA richgr atsign panix.com + 1 239 543 1353
Eastern time. N6LRT I speak for myself & my dogs only. VM'er since CP-67
Canines:Val, Red, Shasta & Casey (RIP), Red & Zero, Siberians Owner:Chinook-L
Retired at the beach Asst Owner:Sibernet-L
