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
