Running caching named and sendmail together - problem?

[Barry Margolin]

In article <a6lvq9$4au at pub3.rc.vix.com>,
susan hall  <suehall at prodigy.net> wrote:
>Someone told me that he had seen on "some web site" advice to not run
>caching named and sendmail on the same box if the box is really busy. 
>We have mail servers which can be so described, and I was wondering if
>anyone knew if there was really any issue here.  The statement was that
>named and sendmail use alot of the same resources, I think.

Named tends to use alot of memory if its cache gets big, and a busy mail
server is likely to result in a big DNS cache.  Named's performance can get
really bad if it can't keep the entire cache in RAM, so if sendmail is
frequently stealing RAM from named they'll both bog down.

In general, it's not a good idea to run multiple services of any kind on a
single machine if it overloads the machine.  Running machines at capacity
means that they don't have any elbow room for occasional heavy bursts.

-- 
Barry Margolin, barmar at genuity.net
Genuity, Woburn, MA
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