David, 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.
BTW your description only applies to IBM storage. Ron > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On > Behalf Of David Betten > Sent: Friday, 24 February 2006 3:11 AM > To: [email protected] > Subject: Re: CFW and DFSORT > > You should not have a problem with DFSORT if you disable cache fast write > in your contoller. Even if the DFSORT default is CFW, the controller will > simply ignore the CFW flag and treat it as a normal write. Generally, I > have not seen a significant perfomrance impact to DFSORT when CFW is > turned > off. This is mainly due to the larger NVS sizes and high speed interfaces > of today's storage technology. > > > > Have a nice day, > Dave Betten > DFSORT Development, Performance Lead > IBM Corporation > email: [EMAIL PROTECTED] > DFSORT/MVSontheweb at http://www.ibm.com/storage/dfsort/ > ---------------------------------------------------------------------- > 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
