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Wow, that is quite a jump in processor
utilization. I also run two scanners (TrendMicro & F-Prot), but I
might not have noticed as much of an increase because I am running on
dual-processor systems. When I get a minute I will throw up a monitor and
check to see how the PRESCAN ON/OFF actually affects my systems.
Bill
----- Original Message -----
Sent: Wednesday, November 10, 2004 1:33
PM
Subject: Re: [Declude.Virus]
PRESCAN
Bill Landry wrote:
Matt, thanks for the analysis. I would very much like to know what the
additional load is on your server by setting PRESCAN to OFF. Please do post
your results if you test this. I have had PRESCAN OFF for a few weeks now,
and have not noticed much of an increase on my servers, but I was not near
capacity anyway.
Bill,
I've got a handy app from
Passler that provides me with nice graphs including processor utilization that
I am sampling every minute (minute averages). I just turned PRESCAN OFF
a short while ago and it's actually a bit worse than a 25% relative increase
on my system. My hourly average went directly from 33% to 46% with
PRESCAN OFF, which is a 39% increase. I've attached an image of
the minute averages with a green line marking the point when I turned PRESCAN
OFF. Take note that I run both F-Prot and McAfee on my system, so
systems with only one virus scanner won't see the same degree of a jump,
though it should be rather large. On systems with plenty of capacity,
this is not a concern and the increase would be not very noticeable despite
being relatively high, but I would like to fill this box to capacity and add
more, but not before I have to.
Matt
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