>-----Original Message----- >From: Eric Bielefeld [mailto:snip] >Sent: Wednesday, May 07, 2008 10:10 AM >To: [email protected] >Subject: 3 Page Datasets on one Volume > >I noticed again today that we have 6 local page datasets on 2 volumes - >each a 3390-3. I'm sure they have Pavs, or the equivelent on the dasd, >but I'm just wondering if that is a good practice or not. >
Lots of misinformation being given out... 1) As long as you have dynamic PAVs, you can have more than one page data set per volume without a performance impact. These aren't SLED devices and the page data sets aren't really on the same physical volume. The bottleneck of a single UCB is eliminated with the PAVs (ASM tells WLM to keep 2 PAVs per page data set). However, it still isn't good to mix other data sets on the same volume because IOS doesn't know diddly about the PAVs assigned for ASM's use and will use them for other purposes if needed. 2) Even if you have HIPERPAV, keep WLM PAVs active or ASM won't assign the extra aliases for page data sets. This is a bug that hopefully will be fixed in z/OS 1.10. (search the archives) 3) You've been able to delete an inactive page data set from a volume even if there is another active page data set since z/OS 1.3 IIRC. 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
