On Thu, 13 Sep 2007 16:10:04 -0400, Jim Mulder <[EMAIL PROTECTED]> wrote:
>IBM Mainframe Discussion List <IBM-MAIN@BAMA.UA.EDU> wrote on 09/13/2007 >11:47:34 AM: > >> Perhaps you can clarify something. If I understand correctly, 2 PAVs >are >> assigned to each page dataset; 1 PAV for single-page requests, and 1 PAV >for >> block requests. If so, is it possible to have any block requests >against the >> PLPA or COMMON page datasets? I understand that if both are on the same >> volume, each will have its own path to the dataset, but will it have >> both? Just curious. > > ASM creates two sets of I/O control blocks for each page data set - one >to be used for any kind of request, and a a second set to be used for a >single page read if the first set is busy. As far as I know, that applies >to PLPA and Common data sets as well as Local. > Common could have a long output channel program due to page steal >processing, and I suppose PLPA could also if common becomes full >and overflows to PLPA. > >Jim Mulder z/OS System Test IBM Corp. Poughkeepsie, NY > But note that ASM only supports starting 2 I/Os to a page data set when there are dynamic PAVs (as opposed to static PAVs). Unless something has changed since z/OS 1.3 when this support was introduced. Mark -- Mark Zelden Sr. Software and Systems Architect - z/OS Team Lead Zurich North America / Farmers Insurance Group - ZFUS G-ITO mailto:[EMAIL PROTECTED] z/OS and OS390 expert at http://searchDataCenter.com/ateExperts/ Systems Programming expert at http://expertanswercenter.techtarget.com/ Mark's MVS Utilities: http://home.flash.net/~mzelden/mvsutil.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
