Sometimes human resources may be stretched so thin that only one production VM environment is possible. There may be established billing procedures, various government and departmental certifications, complex ESMs, performance monitoring, and hardware constraints that make separate IFL-only and CP-only production LPARS a daunting contemplation.
Ray Mrohs U.S. Department of Justice 202-307-6896 > -----Original Message----- > From: The IBM z/VM Operating System > [mailto:ib...@listserv.uark.edu] On Behalf Of Dave Jones > Sent: Wednesday, July 14, 2010 3:49 PM > To: IBMVM@LISTSERV.UARK.EDU > Subject: Re: question to mixed CP an IFL in one LPAR > > And that's why I find the terminology a bit confusing....:-) A client > had a mixed mode LAPR (1 fractional CP and one IFL), and was > puzzled as > to why their Oracle workload was experiencing such poor performance. > PERFKIT showed that almost all of the work was being > dispatched on the > fractional CP with the IFL basically idle. The fix was to > remove the CP > from the LPAR definition, making it, as Alan notes, it "Linux only". > > IMHO, unless there is a clear cut need to combine CPs and IFLs in a > single LPAR(so, e.g., to run z/OS as a guest), it's best not to do so. > > On 07/14/2010 01:37 PM, Alan Altmark wrote: > > On Wed, 14 Jul 2010 13:06:22 -0400, Alan > Altmark<alan_altm...@us.ibm.com> > > wrote: > > > >> o A "Linux only" mode LPAR is a term used by the HMC to > refer to an LPAR > >> that has only IFLs, by defintion. > > > > I am hoist on my own petard: > > o A "Linux only" mode LPAR contains *either* CPs or IFLs. > > > > Alan Altmark > > z/VM Development > > IBM Endicott > > -- > Dave Jones > V/Soft > www.vsoft-software.com > Houston, TX > 281.578.7544 >
