I am NOT inferring using VMRM. From what I can tell, VMRM has no feed
back mechanism, and experience at several installations are that because
of this, VMRM has taken so much storage away from servers that the
server or application dies. I would HIGHLY recommend against using it.
VMRM also has an added design flaw that if you've seen my Linux storage
presentation, you would understand. When paging gets bad, VMRM will
work very hard to increase the paging load.
Using zVPS ("VelocitySoftware.com/zVPS.HTML" (new name for ESALPS), we
do have feedback mechanisms, we know what storage is in use INSIDE the
linux server, and we can quickly determine impact of CMM1 commands on
the server - and can detect when the workload changes. Thus using the
CMM1 commands takes knowledge of how it really works (see my storage
presentation), takes feedback, and takes the ability to react. Some of
this right now needs to be manual - I hope to get something out in very
near term to automate this function using zVPS.
And re cpuplugd, sorry, really don't like that, it really results in
changing scheduler settings dynamically - which means that performance
settings need much better understanding with respect to workload
requirements.
Sterling James wrote:
Barton,
When you say "using CMM1" are you inferring using the CMM-VMRM or
another method like cpuplugd?
Thanks
*Barton Robinson <[email protected]>*
Sent by: The IBM z/VM Operating System <[email protected]>
08/28/2009 12:03 PM
Please respond to
The IBM z/VM Operating System <[email protected]>
To
[email protected]
cc
Subject
Re: Linux Sizing & z/VM Customization
The Q3 issue is likely a websphere polling issue that Rob is working
with WAS development on. The solution to that currently leads back to
using CMM1 as well. Will call.
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