IBM Mainframe Discussion List <[email protected]> wrote on 03/20/2008 10:24:50 AM:
> We're renovating our page dataset allocations (z/OS 1.7 -> 1.9) and > found that our previously-used DEFINE specs from "many moons ago" need > "tweaking" beyond space and volser; specifically, SWAP vs NOSWAP. From > reading the following: > > SWAP|NOSWAP > specifies whether page space is defined for > local system queue area (LSQA) pages or for pageable private area pages. > (Auxiliary storage management separates private area address space pages > into LSQA pages and pageable private area pages.) > > SWAP Specifies that the page space is a > high-speed data set used during a swap operation to store and retrieve > the set of LSQA pages owned by an address space. > > NOSWAP Indicates that the page space is a > conventional page space used to record pageable private area pages. > > It appears that we should take the default of NOSWAP for our LOCALs and > PLPA/COMMON datasets. But since we don't currently "swap-out" address > spaces like "in the old days" (we don't have any specific SWAP > datasets), should we consider defining a subset of our new page datasets > with the SWAP parameter? If so, how many or what proportion? Since > nowadays just about everything is a "high-speed data set" (device), > would it make a measurable difference one way or the other? > ASM support for SWAP data sets was removed in OS/390 2.10. Jim Mulder z/OS System Test IBM Corp. Poughkeepsie, NY ---------------------------------------------------------------------- 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
