Rather than GROUP=NO, there is an entry for "Single User Environment (YES or NO)". Above that line, there is one that asks for "RECOVERY MACHINE USERID (required)"
The note dealing with the single user entry reads: 5. Will the GCS system run in a single user environment? Enter YES to create a single user environment. Specify NO, to create a group environment with common shared storage. Applications that do not require group communications and that run without the use of shared common storage can run in a single system environment. These applications will run without the overhead of group initialization and multiple virtual machines. For example, a test environment requiring a single user and not group communications will be able to run without the overhead of group initialization and the multiple virtual machines. I take that, "the multiple virtual machines," in the last two statements to mean other machines like VTAM, ACS and buddies, but does not include the recovery machine (which is, per the display, required). The note related to the recovery machine question states that the GROUP command does check the recovery machine userid for validity, "but does not prevent you from saving an incorrect entry." What does that mean? You can put in something that would be acceptable as a userid, even though there is no such id in the directory, or it must be an existing id, even including one that is NOLOG? All of that begs the question, how do you accomplish running without the recovery machine? Do you simply enter an id and never log it on? I know that in multiple user mode, GCS refuses to come up in RSCS or any other machine in the group if the recovery machine is not already on. The documentation is perfectly clear (to the one who wrote it). Regards, Richard Schuh ________________________________ From: The IBM z/VM Operating System [mailto:ib...@listserv.uark.edu] On Behalf Of Kris Buelens Sent: Tuesday, April 21, 2009 12:03 PM To: IBMVM@LISTSERV.UARK.EDU Subject: Re: Question on SERVICE EXEC and PUT2PROD You need to build a special GCS for it. Try this in MAINT VMFSETUP ZVM GCS GROUP or maybe GROUP GCSRSCS Group presents panels to define GCS 2009/4/21 Schuh, Richard <rsc...@visa.com<mailto:rsc...@visa.com>> Where is this discussed? When I search the books on the RSCS shelf for GROUP=NO, all I get is a blank page. Neither do I get any hits when searching the "z/VM Group Control System" manual. Regards, Richard Schuh > -----Original Message----- > From: The IBM z/VM Operating System > [mailto:IBMVM@LISTSERV.UARK.EDU<mailto:IBMVM@LISTSERV.UARK.EDU>] On Behalf Of > Alan Altmark > Sent: Tuesday, April 21, 2009 10:30 AM > To: IBMVM@LISTSERV.UARK.EDU<mailto:IBMVM@LISTSERV.UARK.EDU> > Subject: Re: Question on SERVICE EXEC and PUT2PROD > > On Tuesday, 04/21/2009 at 01:21 EDT, Kris Buelens > <kris.buel...@gmail.com<mailto:kris.buel...@gmail.com>> > wrote: > > For GCS, even SERVICE is a bit disruptive: the GCS saves system is > replaced, > > what means an IPL GCS will fail untill the GCS recovery > machine (hence > all > > other GCS users) are restarted. Q NSS USERS GCS will > reveal which of > your > > users might be affected. Without SNA, RSCS is probably the > only user. > > For non-SNA networks, I prefer to run RSCS in single-user > (GROUP=NO) mode so that there is no recovery machine and it > can be treated like a stand-alone CMS user. > > Alan Altmark > z/VM Development > IBM Endicott > -- Kris Buelens, IBM Belgium, VM customer support
