Short answer - no. There is sysplex, Sysplex, Parallel Sysplex, and on and on .....
I would suggest a basic sysplex with shared DASD and a JES MAS. You might want two pairs of EMIF'd ESCON Chps to form two channel to channel sets. (We avoid single points of failure.) This allows you to use XCF. Depending on what industry you are in, you might consider a totally isolated set of DASD for your test environment. Some of us have to do that nowadays. That adds a second set of LPARs with their own CTC sets. GRS exploits the XCF and you are there. Each 'plex will run its own and depend on non shared DASD for isolation. However, you can still define shared DASD, but as offline at IPL to the non desired LPARs. While a step less secure than fully fenced, it is quite handy for some. HTH. -----Original Message----- From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf Of Rodie, Rick Sent: Wednesday, July 12, 2006 12:38 PM To: [email protected] Subject: Coupling Facility -- needed? Esteemed MVS colleagues: We have a 2-LPAR, both MONOPLEX, machine environment today that has only the sysprogs using the 2nd LPAR. z/OS 1.4 soon to be 1.6, then 1.8. It has DASD HCD-defined as shared, and we have been very careful. Our GRS effort of a few years ago was not pursued. But now we wish to branch out to more LPARs snip The first question of the day is, however, at what point would we cross the threshold beyond mere GRS to where we really ought to have a coupling facility and an outright SYSPLEX, even on just one machine? Thanks, Rick Rick Rodie USG Corp [EMAIL PROTECTED] 312-606-5578 NOTICE: This electronic mail message and any files transmitted with it are intended exclusively for the individual or entity to which it is addressed. The message, together with any attachment, may contain confidential and/or privileged information. Any unauthorized review, use, printing, saving, copying, disclosure or distribution is strictly prohibited. If you have received this message in error, please immediately advise the sender by reply email and delete all copies. ---------------------------------------------------------------------- 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
