On Wed, 11 Feb 2009 15:22:56 -0600, Brian Nielsen <[email protected] > wrote:
... > >I did some looking, and saw in the z/VM Performance Report under z/VM 5. 4 >Performance Considerations in the MDC Changes section it says that: > >"APAR VM64082 to z/VM 5.2 and 5.3 changes the behavior of the MDC storag e >arbiter. Recall the arbiter's job is to determine how to proportion >storage between guest frames and MDC. This APAR, rolled into the z/VM 5. 4 >base, is not on any z/VM 5.2 or 5.3 RSU." > >So VM64082 should be on my z/VM 5.4 system. I read the descriptions for >both APARs and it does sound like it is my problem. > >I see that VM64510 is on SLU 0802, but in the meantime I may adjust my >MDCACHE minimum size and/or bias values as suggested in the above >referenced Performance Report section. Is there a potential that doing so >will cause problems in the other storage routine processes mentioned in >the APARs? > >Brian Nielsen >======================== ========================= ======================= I'm sorry I missed that, I forgot to check if VM64082 was in the 5.4.0 ba se, but that does sound right, I knew that at one point, now that I think abo ut it. You definitely do want to get and apply VM64510, then, and see how t hat affects things. In the meantime, yes, you do want to adjust your setting s. As long as you don't exceed the values you were typically seeing on 5.3. 0, that shouldn't affect other processes appreciably. - Bill Holder, z/VM Development, IBM Endicott
