Is it possible to prevent a structure into a particular CF (Coupling Facility)?
The CF Hint functionality is for duplexed structures and is designed to ensure that the instance at SITE2 is used in the case of a SITE1 disaster. This functionality is available in GDPS/HM V3.3. Just to clear some confusion I may have caused. My statement that the CF Hint functionality is available in GDPS/HM is wrong. It is only available in full function GDPS/PPRC. The GDPS/HM documentation will be updated to reflect this. Regards, George Kozakos -- 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
Re: Is it possible to prevent a structure into a particular CF (Coupling Facility)?
Thanks George!!! Brandnew for me. You made my day. :-) We'll look very carefully into this. Might this also be valid for just the mini-GDPS, I mean GDPS Hyperswap Manager? Can HM be considered also to be a full blown Recovery Mgr? Most of the customers (overhere at least) are only interested in the GDPS-HM functionality, while they have already so many automation in place. Often with non-IBM products, as with my installation. Another negative point is that Netveuw is so expensive; we might have no problems with it, but mgt does. The problem with GDPS is that, as long as the contract is not signed, one doesn't have access to the full GDPS literature So, when doing a pre-study ... jan Hi Jan, The new function, called CF hint in GDPS terminology is also available for GDPS HyperSwap Manager. There is a redbook available that introduces GDPS concepts and capabilities: http://www.redbooks.ibm.com/abstracts/sg246374.html?Open Regards, George Kozakos -- 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
Re: Is it possible to prevent a structure into a particular CF (Coupling Facility)?
George and co, Thanks for the pointer to the redbook. I'm aware of it, it's a good one, but it doesn't go deep enough. About OA11719, the so-called 'CF HINT' functionality, with the SITE parameter : it looks to me that this new function is only applicable to duplexed structures. Let me explain what my fears are. 2 sites: Site-1 with 2 CECs, running production with IMS DB2 data sharing + certain duplexed structures (system- DB2-duplexed) Site-2 the recovery site with the PPRC-ed disks with the controlling K-sys (The advantage of this is that the Controlling system will continue to be available even if a disaster takes down the whole production site.). Actually we are only interested in the HyperSwap Manager functionality. Unlike the full GDPS/PPRC offering, GDPS/PPRC HM does not provide any resource mgt or recovery mgt capabilities. That's at least what the GDPS redbook says. Hence a 1-st important question, which has to be answered first: does the K-system in Site-2 have to belong to the very same parallel sysplex as the production systems in Site-1? I am not sure at all, precisely because HM hasn't recovery mgt capabilities. If K-sys on the contrary has to belong to the cross-site production sysplex, we need signalling. Either via CTCs, or via CF signalling structures. We prefer the CF way, because of more modern because of the fact that we would need a CF anyway in disaster mode. So we have a CF at the D/R site. Q2. We are not that sure at all that we are able to keep our (production) structures at the site-1 CFs with PREFLIST ENFORCEORDER(YES). For example, what happens with a duplexed structure (at production Site-1) when one of the site-1 CFs goes down? Jan -- 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
Re: Is it possible to prevent a structure into a particular CF (Coupling Facility)?
George co, Add-on to my previous post about apar OA11719: == quote from within the apar That new 'CF HINT' capability can be used to provide the name of the recovery site when indicating that a recovery mgr is active. ... When a recovery mgr is active, MVS will keep the duplexed structure instance at the recovery site when stopping duplexing for a potential site failure. end-of-quote 2 remarks: 1° As indicated earlier in my previous post, GDPS/PPRC HM (HyperSwap Mgr) does not provide any resource mgt or recovery mgt capabilities. So this apar doesn't seem to be exploitable with GDPS/PPRC HM. 2° it looks to me as if this functionality is applicable on structures duplexed in site-1 (production) site-2 (disaster) Jan -- 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
Re: Is it possible to prevent a structure into a particular CF (Coupling Facility)?
Hi Jan, I'll try to answer your questions but I can't cover all aspects. Just give some general ideas. The CF Hint functionality is for duplexed structures and is designed to ensure that the instance at SITE2 is used in the case of a SITE1 disaster. This functionality is available in GDPS/HM V3.3. The question on where you place CF structures and whether they are duplexed is very dependent on your environment and business requirements. There are some general recommendations which would be true: Have XCF signalling structures at both site1 and site2 Have ISGLOCK at site1 but have the KSYS LPAR weighted higher so that ISGLOCK it can be rebuilt at site2. (This area is complex and there are many considerations) The KSYS does have to be part of the production parallel sysplex and the KSYS disk must be at site 2 for a HyperSwap implementation. If you are already doing CF duplexing at the production site you would not necessarily want to move the second copy to site2 for performance reasons. If you have a single site workload (all prod systems at site1) and there is a site1 failure you will have to IPL your systems at site 2 anyway and so duplexing across sites will not buy much. In fact, one way to implement GDPS/HM would be to have the KSYS LPAR at site1 and the KSYS disk at site2. All CF structures at site1 with the site2 CFs defined in the CFRM policy for use in the event of a site1 failure. This negates the need for cross-site CF and Timer links. The disadvantage is that KSYS would have to be IPL'd at site2 first before starting the recovery in the case of a site1 failure and adds about 20 minutes to the RTO. There would be no difference for site1 disk failure. KSYS would survive as its disk is at site2 and perform the HyperSwap. We can take further discussion off-list. Regards, George Kozakos -- 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
Is it possible to prevent a structure into a particular CF (Coupling Facility)?
Hi Jan,
See APAR OA11719 which provides new function in this area:
Coupling Facilities can now be defined with either SITE(SITE1)
or SITE(SITE2) using the IXCMIAPU utility.
A new sysplex service, IXCCFCM, can be used to provide the name
of the recovery site ('SITE1' or 'SITE2') when indicating that
a recovery manager is active. It can also be used to indicate
that the recovery manager is inactive.
When a recovery manager is active, MVS will keep the duplexed
structure instance at the recovery site when stopping duplexing
for a potential site failure.
GDPS V3.3 is an exploiting Recovery Manager of this new function.
Regards,
George Kozakos
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Is it possible to prevent a structure into a particular CF (Coupling Facility)?
Hi, We are doing a GDPS pre-study. On Site-1 we have 2 footprints with 2 (I)CFs, running production. Disks are PPRC connected to the disaster recovery (DR) site: Site-2. GDPS requires a K-sys (controlling system) at Site-2, preferably with a CF, and making part of the SAMEe (production) sysplex in Site-1. (= GDPS requirements). * Is there a way to *prevent* that structures will be put into this 3-rd CF at DR site-2 in *NORMAL OPERATION mode*, i.e. when the whole production is running in site-1? We think it can't be accomplished with just specifying the PREFLIST, listing the preference order of CFs that one wants structures to be allocated to. * Any experience and/or good avices with this? Jan -- 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
Re: Is it possible to prevent a structure into a particular CF (Coupling Facility)?
Jan wrote: ...snip Is there a way to *prevent* that structures will be put into this 3-rd CF at DR site-2 in *NORMAL OPERATION mode*, i.e. when the whole production is running in site-1? We think it can't be accomplished with just specifying the PREFLIST, listing the preference order of CFs that one wants structures to be allocated to. * Any experience and/or good avices with this? ...snip Jan, the safest way to achieve your target is to have a D/R CFRM couple dataset, with a Policy (inside) which will put all structures in your D/R CF. In case of disaster, you can have your Sysplex restarted in this site-2 CF, simply using an empty XCF CDS and a COUPLExx member pointing to it and to the D/R CFRM CDS, explicitly addressing your D/R Policy. Obviously, I assume that your Data Centers are not involved in a Dispersed Parallel Sysplex. Hope this helps. _ Paolo Cacciari Business Continuity and Recovery Services, IBM Global Services - South Region, EMEA -- 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
Re: Is it possible to prevent a structure into a particular CF (Coupling Facility)?
Re. Paolo Cacciari saying: Obviously, I assume that your Data Centers are not involved in a Dispersed Parallel Sysplex. It *IS* about a GDPS config, Paolo, with the K-sys controlling system in the C/R site. Jan - Oorspronkelijk bericht - Van: Paolo Cacciari [mailto:[EMAIL PROTECTED] Verzonden: maandag, september 11, 2006 02:57 PM Aan: IBM-MAIN@BAMA.UA.EDU Onderwerp: Re: Is it possible to prevent a structure into a particular CF (Coupling Facility)? Jan wrote: ...snip Is there a way to *prevent* that structures will be put into this 3-rd CF at DR site-2 in *NORMAL OPERATION mode*, i.e. when the whole production is running in site-1? We think it can't be accomplished with just specifying the PREFLIST, listing the preference order of CFs that one wants structures to be allocated to. * Any experience and/or good avices with this? ...snip Jan, the safest way to achieve your target is to have a D/R CFRM couple dataset, with a Policy (inside) which will put all structures in your D/R CF. In case of disaster, you can have your Sysplex restarted in this site-2 CF, simply using an empty XCF CDS and a COUPLExx member pointing to it and to the D/R CFRM CDS, explicitly addressing your D/R Policy. Obviously, I assume that your Data Centers are not involved in a Dispersed Parallel Sysplex. Hope this helps. _ Paolo Cacciari Business Continuity and Recovery Services, IBM Global Services - South Region, EMEA -- 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 -- 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
Re: Is it possible to prevent a structure into a particular CF (Coupling Facility)?
Jan wrote: It *IS* about a GDPS config, Paolo, with the K-sys controlling system in the C/R site. Jan ...snip Jan, in this case, assuming that the only active system in the D/R site is K-sys, what I suggested is still applicable . _ Paolo Cacciari Business Continuity and Recovery Services, IBM Global Services - South Region, EMEA -- 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
