On Thu, 8 May 2008 09:35:01 -0700, Ron Hawkins <[EMAIL PROTECTED]> wrote:
>Bill, > >The devil is in the detail. If the page datasets are being accessed their >own alias UCB then the channel commands, FCP frames and disk IO are being >interleaved with all the other volumes that share the same channels, storage >ports and disk drives. > >Even a heavy use sequential use dataset on the same volume will create the >same interference as if it was on another volume sharing the same channels >and Parity Group. In your example, I don't see how isolation reduces that >impact. > >Ron > Ron, see my previous post and I'm sure there is something in the archives from either Jim Mulder or Peter Relson (where do ya think I got my information from?) :-) The other I/O could take the PAVs that ASM has recommended to WLM to assign. That could mean no UCB for a page request. http://bama.ua.edu/cgi-bin/wa?A2=ind0805&L=ibm-main&D=1&O=D&T=0&P=49572 So while having multiple page data sets per volume should not be a problem with dynamic PAV, having other active data sets could be. 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 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
