This Retain text is still misleading: - an unmodfied CP will never let a Reserve go through the HW for non-fullpack mdisks So, the text about placing the minidisks at the exact same place for all sharing z/VM systems, is useless. - the mode MWV triggers only *Virtual* Reserve/Release. Unless you run two copies of RACF on a single VM system, no Virtual R/R is required. MWV could protect RACFVM and RACMAINT stepping on eachother, but I don't know if CP allows both of them to become active concurrently.
2009/1/15 Greg Dyrda <[email protected]>: > I came across the following explanation from IBM when setting up out RACF. > Looks like you could use mdisks if only VM shares the database, but you > still have to waste the rest of the space on the volumes. > > .FO OFF > .RH ON > Item BDC000028340 NOM (DATE/20031125) IBM INTERNAL USE > ONLY > .SP 2 > .RH OFF > TITLE: > RACF database build > *** SOURCE: UNITED STATES (ASKQQA) *** > -OPM2008 -5799WZY00 -ETRPRO -P3S3-03/11/24-22:13 -XE > ************************** For IBM Use Only **************************** > * In RETAIN use CR CA to complete the call. * > * The use of CC will not notify the originator of a response! * > ************************************************************************ > RESPOND ELECTRONICALLY. > Route = 5799WZY00 . > Abstract: RACF database build > Welcome to zSeries Q A Technical Support - Electronic Q/A Service > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > This queue is for VM and related products: DFSMS/VM,DIRMAINT,GCS, > ISPF/VM,PVM,RACF/VM,REXX/VM,RSCS,RTM/ESA etc. > To help us accurately respond to your GENERAL-USAGE (How-To) QUESTION, > please provide the Product Name, > Version, Release and Maintenance Level of all software that may be > related to this question. Include any other relevant info. that will > help expedite a response, eg. hardware installed, error messages etc. > Product Name Version/Release Maintenance Level > * * You can add the text of your question after you press enter * * > I am on z/VM V4R4 with RACF. I am attempting to build a racf database > that will be shared with several (level 1) VM systems. The documentation > in the RACF program directory (5739-A03) is a little confusing. It > recommends using a full volume mini disk but then says do not place any > mini disk on cylinder zero. > Can you start at cylinder zero? > Can you use another name in the racdsf command besides RACF and RACFBK > if you start at cylinder zero? > If I start at cylinder 1 will the z/VMs do the physical enqueuing to > reserve the volume? > If not how do I configure them to use that facility? > =EVANS, PAUL G -5799WZY00 -L40D/QAVM -P3S -03/11/24-22:38 -CT > =EVANS, PAUL G -568411202 -L40D/QAVM -P3S3-03/11/24-22:41 -CR > S5> SERVICE GIVEN= 39 SG/39/ > S7> SERVICE GIVEN= 39 SG/39/ > Action taken: > Hello Walter > The Program directory is a bit misleading. I will check into > this and have a further update for you in the morning. > Many Thanks > Paul Evans > action plan; investigate sharing between VM systems. > =EVANS, PAUL G -568411202 -L40D/QAVM -P3S3-03/11/25-16:23 -CR > S7> SERVICE GIVEN= 39 SG/39/ > Action taken: > Hello Walter, > That Program Directory is somewhat confusing so I will try to sort > it out for you. When sharing a RACF database between VM systems, > you have a bit more choice as to how to do it than you have if > MVS is in the picture. If a MVS system will ever be sharing this > database then that makes a big difference. MVS does not understand > what a minidisk is and expects the real label in real cylinder zero > to have a VTOC pointer and all the MVS stuff. Thus is MVS is going to > share the RACF database, then you would want to use a Full Pack Minidisk > for the database addresses. A Full Pack Mini actually starts at Cylinder > Zero for the entire volume. The Minidisk statements in the directory > would be something like: > MDISK 200 3390 0 END RACF MWV > MDISK 300 3390 0 END RACFBK MWV > Please note that the MWV means Multi Write with Virtual Reserve/Release > The volume also needs to have the SHARED option in the SYSTEM CONFIG > to tell z/VM to use Real Reserve/Release. > In the RACF p^rogram directory, it mentions that you can use different > values than RACF and RACFBK by reassembling ICHRDSNT I believe. > The RACF System Programmer's Guide has further information about > that. > If you are just sharing between VM systems and MVS will never be > in the picture, then you can define the 200 and 300 as regular minidisks > but the EXACT same definition must be made on ALL z/VM systems and > again the MWV for the MDISK is needed and the SHARED option in the > SYSTEM CONFIG is needed. Note that reserve/release affects the > entire volume so it is not wise to place any other minidisks on that > volume. Of course, the backup database should be on a different physical > volume for availability purposes. > Hope this helps clarify things. If you have further > questions, please let us know. > Many Thanks > Paul Evans > action plan: await further update from Walter ( or closure ) > -OPM2008 -568411202 -ETRPRO -P3S3-03/11/25-17:42 -XC > Reason For Closure: > Thank you. Beautiful explaination. Include that in > the Program Directory. > =EVANS, PAUL G -568411202 -L40D/-------P3S3-03/11/25-19:46 -AT > Action taken: > Hello Walter, > Many thanks for your comments. I will pass this info along to the > authors of the Program Directory for their consideration. > In the meantime, I will archive this for our reference. > Many Thanks > Paul Evans > action taken: closed by Walter > promote qavm > =EVANS, PAUL G -568411202 -L993/-------P3S3-03/11/25-19:52 -LC > > > > > > Florian Bilek > <florian.bi...@gm > AIL.COM> To > Sent by: The IBM [email protected] > z/VM Operating cc > System > <[email protected] Subject > ARK.EDU> Sharing the RACF database in CSE > > > 01/15/2009 10:11 > AM > > > Please respond to > The IBM z/VM > Operating System > <[email protected] > ARK.EDU> > > > > > > > Dear all, > > I am planning to setup RACF in a CSE environemnt. The CSE is on two > different processors. I have read in the Program Directory that in this c > ase > the RACF database mustn't be on a CSE formatted volume since it uses real > > reserve/release CCWs. Therefore I can put it only on a real volume and > dedicate it to RACFVM or make a fullpack minidisk out of it. > > Isn't that an overkill of dedicating two full 3390 addresses (5 GB) for 2 > x > 17 cylinder of data, the size of the database?? > > Could I put the Primary and the Backup at least on the same volume? > > What would you recommend? > > Thank you. > > Best regards, > Florian > ----------------------------------------- > ****************************************************************** > This message originated from the Internet. Its originator may or > may not be who they claim to be and the information contained in > the message and any attachments may or may not be accurate. > ****************************************************************** > -- Kris Buelens, IBM Belgium, VM customer support
