I apologize, my earlier append was not clear. DFSORT does check and if CFW is not active in the controller, then the CFW bit is not turned on. Also, I would agree that there is a performance benefit of using CFW since you eliminate the need to write to the NVS. But I have seen many customers running effectively with CFW=NO. So if you're looking for the high availability of a GDPS environment and Hyperswap, I don't think disabling CFW is going to be a show stopper.
Have a nice day, Dave Betten DFSORT Development, Performance Lead IBM Corporation email: [EMAIL PROTECTED] DFSORT/MVSontheweb at http://www.ibm.com/storage/dfsort/ IBM Mainframe Discussion List <[email protected]> wrote on 02/24/2006 12:16:15 AM: > Bruce, > > Yes I misread that. > > But with CFW ON in DFSORT and OFF in the Controller I don't think SORT turns > on the CFW bit. I think CFW ON in DFSORT causes a check for CFW ON in the > controller, and then CFW is set appropriately. > > David's reply suggests that SORT sets the CFW bit even when the controller > has CFW OFF. The IO chaining behaviour suggests otherwise. > > Ron > > > -----Original Message----- > > From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On > > Behalf Of Bruce Black > > Sent: Friday, 24 February 2006 10:52 AM > > To: [email protected] > > Subject: Re: CFW and DFSORT > > > > > > > > You're from IBM right? So you are saying that ESS and DS8K ignore CFW > > and > > > put a copy in the NVS anyway? Then why does DFSORT change its IO > > chaining > > > behaviour when CFW is on. > > No, he said that if you disable CFW in the control unit but enable it in > > DFSORT, the control unit ignores the CFW request and treats it as a > > regular write. > > > > -- > > Bruce A. Black > > Senior Software Developer for FDR > > Innovation Data Processing 973-890-7300 > > personal: [EMAIL PROTECTED] > > sales info: [EMAIL PROTECTED] > > tech support: [EMAIL PROTECTED] > > web: www.innovationdp.fdr.com > > > > ---------------------------------------------------------------------- > > 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 ---------------------------------------------------------------------- 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
