Linux bind / dhcp iowait status

[Scott Dolan]

Can you remove me off of this list

sdolan at jernie.com
 

-----Original Message-----
From: dhcp-users-bounce at isc.org [mailto:dhcp-users-bounce at isc.org] On
Behalf Of Simon Hobson
Sent: Wednesday, March 15, 2006 12:16 PM
To: dhcp-users at isc.org
Subject: Re: Linux bind / dhcp iowait status

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
>bind-9.2.4-7
>dhcp-3.0.1
>
>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 ?