Linux bind / dhcp iowait status

Simon Hobson dhcp at
Wed Mar 15 17:06:39 UTC 2006

Tom Greaser wrote:

>have a beefy box that shows 18.40 % iowait at PEAK times
>and as low as 5.50 % during work hours..
>have 2000 phones lease set to 1 day
>2000 pc lease set to 4 hours..
>running ddns on this host ...
>just wanting to see if this is "normal"
>will track down to see if its named or dhcpd doing the bulk of IO wait..
>Its an Redhat AS 4 update 3 box with mirrored scsi Ultra 320 drives
>10000 rpm
>from free -h
>buffer 137meg       cache 1627 meg

That sounds exceedingly high IF the box is only doing DHCP and DNS. 
In fact I'd consider 5.5% to be exceedingly high for such a box.

What else is running on the box ?

Does it make any difference if you increase lease times as Glenn suggests ?

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