Concurrent hits limitation

[Bunny Singh]

We are using dynamic DNS update and running two scsi disk on RAID-1. We are having  IBM X3650 server with 4 gb RAM.
 
How many IP addresses do you have among your 800 subnets? What's your
lease time? What's your *target* for DHCP updates (Request/Ack) per
second?
 
We have around 2, 00,000 Ip's. Our lease time is 4 days, Target hits (DORA) will be 5000 per second.
 
Actually we are in to IPTV services so clients booting their STB's several times in a day.
 
Also Please suggest is the server failover for the huge IP database is good or  we will put the servers (without running failover protocol) behind the Loadbalance in Active Standby state.
 
Regards
Daljit Singh


--- On Mon, 1/18/10, sthaug at nethelp.no <sthaug at nethelp.no> wrote:


From: sthaug at nethelp.no <sthaug at nethelp.no>
Subject: Re: Concurrent hits limitation
To: dhcp-users at lists.isc.org, jump2fly82 at yahoo.com
Date: Monday, January 18, 2010, 12:13 PM


> I want to know about the limitation in DHCP server. Actually we are running dhcp on failover mode with 800 subnet and it will be going to expand.
>  
> I need to know how many hits (concurrent connections) dhcp services can handle.

Heavily dependent on your disk subsystem. Also on whether you use dhcpd
to perform dynamic DNS updates.

Handling DHCP requests is *disk intensive*. A good RAID subsystem with
lots of battery backed cache, or a solid state disk, will do wonders.


How many IP addresses do you have among your 800 subnets? What's your
lease time? What's your *target* for DHCP updates (Request/Ack) per
second?

Steinar Haug, Nethelp consulting, sthaug at nethelp.no



      
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