I have to agree Ted that it doesn't make a whole lot of sense, but that is nonetheless the way it works.
I extracted the following from chapter 2 (title: Selecting the SMF Data Set Control Interval) of the MVS SMF Guide: The CI size of the first SMF data set that the system opens during an IPL will be the CI size for all SMF data sets for that IPL. If SMF encounters a data set with a different CI size, then the data set is not used, and the system displays a message on the console informing the operator of the problem. A data set that has any error does not go on the list of active data sets. If all data sets fail to be successfully opened and allocated, then 4K (4096 bytes) is chosen as the default CI size for the IPL, and SMF buffers the data. If you define a new group of SMF data sets with a different CI size, you must re-IPL to use these data sets. When you define an SMF data set, the logical record size must be 10 less than the CI size. Cheers, Alan -----Original Message----- From: IBM Mainframe Discussion List [mailto:ibm-m...@bama.ua.edu] On Behalf Of Ted MacNEIL Sent: Tuesday, November 16, 2010 15:17 To: IBM-MAIN@bama.ua.edu Subject: Re: ReSizing the SMF Man Files >You cannot stop and start SMF, the ONLY way to change CISIZE for the MAN files >is to IPL, period. That really doesn't make sense to me, but I'll take your word for it. Do you happen to know where it's documented? I couldn't find any reference. - Ted MacNEIL eamacn...@yahoo.ca ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu 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 lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html