Rcihard S. and Ray M. both point out situations where having the LAPRs
be IFL-only or CP-only ones is not feasible, or desirable, for a number
of reasons. In these situations, having the ability to "mix-and-match"
engines in an LPAR is a good thing.
I just wish we didn't have to deal with all of this silliness of
different types of engines in the first place. Sigh....
Have a good one.
On 07/14/2010 03:09 PM, Mrohs, Ray wrote:
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:[email protected]] On Behalf Of Dave Jones
Sent: Wednesday, July 14, 2010 3:49 PM
To: [email protected]
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<[email protected]>
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
--
Dave Jones
V/Soft
www.vsoft-software.com
Houston, TX
281.578.7544
