DHCP Failover recovery......

[Glenn Satchell]

There are two factors: the time it takes to transfer 125k leases to the
other server, and the configured MCLT parameter. There is a description
of what happens during startup in the dhcpd.conf man page in the section
titled "FAILOVER STARTUP".

regards,
-glenn

>From: "li jun" <li-jun-a at hdsc.hitachi-displays.com>
>Subject: RE: DHCP Failover recovery......
>Date: Mon, 4 Aug 2008 08:54:00 +0800
>
> I don't know exactly the factor that affects the recovering process.May be the 
recovery time is depend on the number of the clients.and in my company,there are 
about 500 PCs,and the recovering process costs 15min.
>  By the way,who can tell me the factors?
> 
>
>--------------------- 
>LIJUN 
>IS DEPARTMENT 
>HITACHI DISPLAYS DEVICES(SUZHOU) 
>CN 
>
> 
>
>
>  _____  
>
>From: dhcp-users-bounce at isc.org [mailto:dhcp-users-bounce at isc.org] On Behalf Of 
Luis Fernando Lacayo
>Sent: Friday, August 01, 2008 9:13 PM
>To: dhcp-users at isc.org
>Subject: RE: DHCP Failover recovery......
>
>
>Thanks for the words of encouragement.  I have let it run from an hour, and my 
customers are crying blood murder. 
>
>Does anyone have any idea of how long it will take to recover 125K leases.
>
>Thanks, 
>
>Luis
>
>On Fri, 2008-08-01 at 08:18 +0800, li jun wrote:
>
>
> 
>
>Don't worrry,Just wait serveral more minutes,because the recovering process 
costs some time. 
>
>
>--------------------- 
>LIJUN 
>IS DEPARTMENT 
>HITACHI DISPLAYS DEVICES(SUZHOU) 
>CN 
>
>
>
>
>  _____  
>
>
>From: dhcp-users-bounce at isc.org [mailto:dhcp-users-bounce at isc.org] On Behalf Of 
Luis Fernando Lacayo
>Sent: Friday, August 01, 2008 3:24 AM
>To: dhcp-users at isc.org
>Subject: DHCP Failover recovery......
>
>
>
>
>
> 
>a few weeks ago I posted a message about a problem that I 
>
>encountered.  I had a two server dhcp redundant/failover setup and I 
>
>deleted the dhcp.leases(~) files as I did not have enough room to 
>
>save them. ( I know a very stupid thing to do. no excuses).
>
>
>
>I have been running on a single (with none failover) dhcp server and 
>
>want to return to a two server configuration. I am not doing DDNS, 
>
>so I don't have to worry about that now.  The problem is that when I 
>
>restart both servers they STOP offering IP addresses, and I see a 
>
>lot of recovering messages on the logs.
>
>When I start the servers, the logs show the following:Jul 28 07:56:36 D4FWWC1 
dhcpd: Sending on   LPF/eth0/00:15:c5:fe:57:bd/10.129.177/24
>Jul 28 07:56:36 D4FWWC1 dhcpd: Listening on 
LPF/eth0/00:15:c5:fe:57:bd/10.129.177/24
>Jul 28 07:56:36 D4FWWC1 dhcpd: Sending on   Socket/fallback/fallback-net
>Jul 28 07:56:36 D4FWWC1 dhcpd: Sending on   
LPF/eth0/00:15:c5:fe:57:bd/10.129.177/24
>Jul 28 07:56:36 D4FWWC1 dhcpd: failover peer co-wan03: I move from recover to 
startup
>Jul 28 07:56:36 D4FWWC1 dhcpd: Sending on   Socket/fallback/fallback-net
>Jul 28 07:56:37 D4FWWC1 dhcpd: failover peer co-wan03: I move from recover to 
startup
>Jul 28 07:56:37 D4FWWC1 dhcpd: dhcpd startup succeeded
>
>skip a few lines and I see the same message for most of the subnets on the 
dhcpd.conf file. 
>DHCPREQUEST for 10.129.77.204 from 00:12:3f:08:0d:e3 via 10.129.76.3: not 
responding (recovering).
>
>
>
>Thanks, 
>
>
>
>Luis
>
>
>
>
>-- 
>
>Luis Fernando Lacayo
>
>Chicago Public Schools
>
>Senior Unix Administrator
>
>ITS/ UNIX Infrastructure
>
>Office: 773-553-3835
>
>Cell: 773-203-4493
>
>
>
>
>  _____  
>
>
>Disclaimer: The contents of this e-mail, and its attachments, if any, are 
confidential and may be protected by law against any unauthorized use. If you 
have received this e-mail by mistake or have reason to believe that you are not 
the intended recipient, please notify the sender by reply e-mail as soon as 
possible and delete it from your computer system immediately thereafter. If you 
are not the intended recipient, you must not copy this e-mail or attachment or 
disclose the contents to any other person. While we have made every effort to 
keep our network virus free, we take no responsibility for any computer virus 
which might be transferred by way of this e-mail. 
>  _____  
>
>
>
>
>
>
>-- 
>
>Luis Fernando Lacayo
>
>Chicago Public Schools
>
>Senior Unix Administrator
>
>ITS/ UNIX Infrastructure
>
>Office: 773-553-3835
>
>Cell: 773-203-4493
>
>
>Disclaimer:
>The contents of this e-mail, and its attachments, if any, are confidential and 
may be protected
>by law against any unauthorized use.  If you have received this e-mail by 
mistake or have
>reason to believe that you are not the intended recipient, please notify the 
sender by reply
>e-mail as soon as possible and delete it from your computer system immediately 
thereafter.
>If you are not the intended recipient, you must not copy this e-mail or 
attachment or disclose
>the contents to any other person.  While we have made every effort to keep our 
network virus free,
>we take no responsibility for any computer virus which might be transferred by 
way of this e-mail.
>