Re: Storage Configuration

[Jim Bohnsack]

My guess would be that when Bill wrote "This is our rule of thumb. This seems sufficient in most cases" that he had found another way to say It depends.  I wonder if he could copyright that?

Jim

At 09:37 AM 8/25/2006, you wrote:

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So, Bill, are you saying that in almost all cases, we should use no more
than 2GB
of extended storage.  What happens when the 2GB is exceeded?
Thanks,
Steve G.





Bill Bitner <[EMAIL PROTECTED]>
Sent by: The IBM z/VM Operating System <IBMVM@LISTSERV.UARK.EDU>
08/24/2006 07:00 PM
Please respond to The IBM z/VM Operating System

 
        To:     IBMVM@LISTSERV.UARK.EDU
        cc:
        Subject:        Re: Storage Configuration


We are recommending for z/VM 5.2.0, 25% of processor memory be
defined as xstore up to a max of 2GB (that is no more than 2GB).
This is our rule of thumb. This seems sufficient in most cases to
buffer active guests from idle guests suddenly becoming active and
bringing in entire working sets. Also allows pages to be moved out
to DASD based on 2 levels of LRU, the xstore one being time stamped.

Bill Bitner - VM Performance Evaluation - IBM Endicott - 607-429-3286



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<br><font size=2 face="sans-serif">So, Bill, are you saying that in almost all cases, we should use no more than 2GB</font>
<br><font size=2 face="sans-serif">of extended storage. &nbsp;What happens when the 2GB is exceeded?</font>
<br><font size=2 face="sans-serif">Thanks,</font>
<br><font size=2 face="sans-serif">Steve G.</font>
<br>
<br>
<br>
<br>
<table width=100%>
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<td>
<td><font size=1 face="sans-serif"><b>Bill Bitner &lt;[EMAIL PROTECTED]&gt;</b></font>
<br><font size=1 face="sans-serif">Sent by: The IBM z/VM Operating System &lt;IBMVM@LISTSERV.UARK.EDU&gt;</font>
<p><font size=1 face="sans-serif">08/24/2006 07:00 PM</font>
<br><font size=1 face="sans-serif">Please respond to The IBM z/VM Operating System</font>
<br>
<td><font size=1 face="Arial">&nbsp; &nbsp; &nbsp; &nbsp; </font>
<br><font size=1 face="sans-serif">&nbsp; &nbsp; &nbsp; &nbsp; To: &nbsp; &nbsp; &nbsp; &nbsp;IBMVM@LISTSERV.UARK.EDU</font>
<br><font size=1 face="sans-serif">&nbsp; &nbsp; &nbsp; &nbsp; cc: &nbsp; &nbsp; &nbsp; &nbsp;</font>
<br><font size=1 face="sans-serif">&nbsp; &nbsp; &nbsp; &nbsp; Subject: &nbsp; &nbsp; &nbsp; &nbsp;Re: Storage Configuration</font></table>
<br>
<br>
<br><font size=2 face="Courier New">We are recommending for z/VM 5.2.0, 25% of processor memory be<br>
defined as xstore up to a max of 2GB (that is no more than 2GB).<br>
This is our rule of thumb. This seems sufficient in most cases to<br>
buffer active guests from idle guests suddenly becoming active and<br>
bringing in entire working sets. Also allows pages to be moved out<br>
to DASD based on 2 levels of LRU, the xstore one being time stamped.<br>
<br>
Bill Bitner - VM Performance Evaluation - IBM Endicott - 607-429-3286<br>
</font>
<br>
<br>
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Jim Bohnsack
Cornell Univ.
(607) 255-1760