HI Jim, Just to let you know I was able to get the circumvention fix from Level 2. This was able to be installed dynamically and only took a few minutes to install. I implemented it and was able to issue the SET REORDER command for some of my guests. I did get a warning message basically stating that this circumvention was not going to be permanent. But it worked. We were running into some real trouble with some of our large guests. We were seeing these guests stopping for seconds at a time during multiple intervals while reordering was taking place. This was causing major TCP/IP networking issues for one.
Once I turned off FRAME REORDERING the delays went away I even saw a drop off in the number of SCAN TWO PAGE STEALS as well as a DROP in Emergency Scan Steals of NSS/DCSS pages. So if anyone is seeing either Console Function Waits (CF) and or FRAME REORDERING taking place you want to turn it off. I will be installing the z/VM 5.4 version of the PTF UM33167 during our next outage so that it becomes permanent. Thank You, Terry Martin Lockheed Martin - Citic z/OS and z/VM Performance Tuning and Operating Systems Support Office - 443 348-2102 Cell - 443 632-4191 From: The IBM z/VM Operating System [mailto:[email protected]] On Behalf Of James Vincent Sent: Monday, November 29, 2010 3:31 PM To: [email protected] Subject: Re: FRAME REORDER FIX Hello Terry - we have that PTF loaded on z/VM 5.4. If you look at the modules affected, I hope you would see that it is not a 'dynamic loaded module' but an update to a number of CP parts. An IPL is needed to get that new function (so yes, an outage will be required.) I've played around with the command a little, but have not gotten very far with it yet (time issue only) -- James Vincent On Sat, Nov 27, 2010 at 8:46 AM, Martin, Terry R. (CMS/CTR) (CTR) <[email protected]<mailto:[email protected]>> wrote: Error! Filename not specified. Hi I want to turn off FRAME REODERING for some guests as described in APAR VM64774 (PTF UM33167 5.4). We had heard that the new (Set REORDER) command was shipped as a dynamically loaded module that fooled around with some fields in the VMDBK. Has anyone used this and if so were you able to implement this without a system outage? Thank You, Terry Martin Lockheed Martin - Citic z/OS and z/VM Performance Tuning and Operating Systems Support Office - 443 348-2102 Cell - 443 632-4191 Error! Filename not specified.
