RE: Odd swap & memory behavior on Solaris 9, Oracle 9iR2

From: Jesse, Rich <Rich.Jesse_at_qg.com>
Date: Tue, 18 Apr 2006 15:03:37 -0500
Message-ID: <FB5D3CCFCECC2948B5DCF4CABDBE66975460F5@QTEX1.qg.com>

I seem to remember that by default /tmp is created to emulate swap, which I believe can add some confusion over actual swap usage. Check out the filesystem for /tmp using "df -k". I never really understood that, though...  

<disclaimer>"Hearsay", your Honor; not admissible as evidence</disclaimer>  

Rich

	-----Original Message-----
	From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Bobak, Mark
	Sent: Monday, April 17, 2006 10:30 AM
	To: mzito_at_gridapp.com; oracle-l_at_freelists.org
	Subject: RE: Odd swap & memory behavior on Solaris 9, Oracle

9iR2                  

        Hi Matt,          

        I ran into this a while ago, on boxes where the swap configuration was pretty skimpy. We had cases where we could not fully utilize available RAM due to swap shortages, and the fact that Solaris wants to "reserve" swap space equal to the amount of RAM being allocated.          

        The solution was to find an "official" MetaLink note that recommends having swap 2x physical RAM, and using that and the "disk is cheap" argument to get the sysadmins to configure more swap. Once we did that, we never looked back, and there's been no problem.          

        In reality, you can probably get away w/ 1.5x RAM, maybe less on boxes w/ really large amounts of RAM.          

        Hope that helps,          

        -Mark          

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Received on Tue Apr 18 2006 - 15:03:37 CDT