Dennis Kubes wrote:
What we were seeing is the dns server cached the addresses in memory (bind 9x..) and because we were caching so many addresses on a single dns server it would eat up memory and eventually begin swapping to disk. When this occurred the server load got up to 1.5 and the iowait was near 100%. Basically it stalled the box. Requests were still getting through but it was very slow. Our solution (at least temporarily was to restart the bind service (not the box just the daemon) every couple of hours to flush the memory.
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