Cobe, I've never seen that suggested or recommended. As Mr Merrill says "Just because you can, doesn't mean you should."
Ron > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of > Cobe Xu > Sent: Thursday, January 21, 2010 8:17 AM > To: [email protected] > Subject: Re: [IBM-MAIN] Page Dataset Question > > IIRC, Isn't it suggested to allocate one Local on a full volume? > > On Thu, Jan 21, 2010 at 2:04 AM, Staller, Allan <[email protected]>wrote: > > > This is a performance issue. In order for ASM not to care, the pages are > > distributed (roughly equally) across all available page datsets. If the > > algorithm were to take into account the available space: > > 1) the additional overhead of keep track (probably miniscue per IO, but > > imagine a paging rate of 100's or even thousands per second. (this > > actually happened in "the good old days"). > > 2) The concentration of pages in the larger page dataset would create a > > "hot spot" in the aux stor subsystem and provide uneven performance, > > depending on where your stolen pages were. > > > > > > <snip> > > Wouldn't it make more sense if "distributed equally" were defined as a > > percentage of available space rather than number of pages? > > </snip> > > > > All this does is allow for human error if the page ds's are not sized > > equally! > > > > ---------------------------------------------------------------------- > > 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 > > > > > > -- > Cobe Xu > > Best Regards > ----------------------------------------------------------- > zOS Performance & Capacity Analyst > E2E Performance Analyst > Email: [email protected] > ----------------------------------------------------------- > ---------------------------------------------------------------------- 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
