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
