Sudden Slow Performance
kelvin-lists at williamschadwell.com
Mon Dec 15 14:38:10 UTC 2008
Network good. No errors on the interfaces.
No disk errors reported.
No patches applied.
CPU and Memory levels are good.
Number of clients always increases--but not a drastic amount. Maybe 50 new
From: dhcp-users-bounces at lists.isc.org
[mailto:dhcp-users-bounces at lists.isc.org] On Behalf Of Glenn Satchell
Sent: Monday, December 15, 2008 9:25 AM
To: dhcp-users at lists.isc.org
Subject: Re: Sudden Slow Performance
>From: "Kelvin Williams" <kelvin-lists at williamschadwell.com>
>To: <dhcp-users at lists.isc.org>
>Subject: Sudden Slow Performance
>Date: Mon, 15 Dec 2008 08:57:08 -0500
>X-BeenThere: dhcp-users at lists.isc.org
> We've been operating one of our DHCP Servers for approximately 6 months
> without any issues. This server is on a network with about 2,500 hosts.
> The server has worked flawlessly until last week when it became extremely
> Clients are having to send multiple DISCOVERs before the server will
> respond, and sometimes the server does not respond timely to a REQUEST.
> Causing the clients to timeout and stop attempting.
> We've reviewed the server's load, and its very, very light. vmstat
> show any bottlenecks in the processor or disk. The current version we are
> running is 3.1.1;
> As I stated, this all occurred within the last week. Can anyone recommend
> something to check? Or is there a way to get greater verbosity from the
> debug mode?
> Many thanks in advance.
Have you checked out the hardware, network, etc? Maybe there is a hardware
fault. Consider the slow dhcp response to be a symtim rather than the fault?
Could be a number of things:
- faulty network. try a different cable and/or switch port and/or nic
- disk errors. check logs for warnings or errors
- operating system patches. done any os patches around the time it went bad?
- any other system changes at that time?
- rogue process using all available cpu or memory?
- did the number of clients increase that week?
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