RE: Odd swap & memory behavior on Solaris 9, Oracle 9iR2
- From: "Jesse, Rich" <Rich.Jesse@xxxxxx>
- To: <Mark.Bobak@xxxxxxxxxxxxxxx>, <mzito@xxxxxxxxxxx>, <oracle-l@xxxxxxxxxxxxx>
- Date: Tue, 18 Apr 2006 15:03:37 -0500
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@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Bobak, Mark
Sent: Monday, April 17, 2006 10:30 AM
To: mzito@xxxxxxxxxxx; oracle-l@xxxxxxxxxxxxx
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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