failover timeout

[Abu Abdulla alhanbali]

Thanks Glenn. i was thinking the server will take a decision by itself
(according to some logic) to take the full traffic.

On Fri, Apr 9, 2010 at 8:29 AM, Glenn Satchell
<glenn.satchell at uniq.com.au> wrote:
> 200k leases with one week duration. One week is 604800 seconds, so 200k
> leases renewing weekly would be about one every 3 seconds. Even if clients
> renew more often (typically 50% of lease time, or customers reboot CPE) this
> is still a very low number that would not require a very powerful computer.
> Given the high number of clients, failover or HA of some sort would be a
> good recommendation.
>
> regards,
> -glenn
>
> On 04/09/10 00:39, Glenn Satchell wrote:
>>
>> 4,2.0 (currently alpha) has a configurable auto-partner-down feature.
>> For all earlier releases the server stays in communications-interrupted
>> and *never* goes to partner down mode without manual action.
>> Partner-down is the mode where the surviving server can allocate
>> addresses previously given out by the failed server.
>>
>> Having said that it is pretty easy to write a script that monitors the
>> other dhcp server, and uses omshell to switch to partner down when it
>> detects that the other server has gone away. When the failed server
>> comes back it will come out of partner-down mode and return to normal as
>> part of the startup negotiations.
>>
>> There was a post to the list by David Hankins on 25 Feb this year
>> mentioning this which gives a lot more detail.
>>
>> regards,
>> -glenn
>>
>> On 04/08/10 13:48, Abu Abdulla alhanbali wrote:
>>>
>>> this is not what i mean. if the primary servers is down, how long will
>>> it take the secondary server to start assigning the IPs that are
>>> reserved for the primary server. you can do this manually using the
>>> omshell but i don't know if this will be done automatically or not.
>>>
>>> On Wed, Apr 7, 2010 at 7:55 PM, Banana Flex<flex.banana at bluewin.ch>
>>> wrote:
>>>>
>>>> hi
>>>>
>>>> you can do a collaboration betwen two servers that send the same
>>>> subnet, see the man page of dhcpd.conf for many information. you can
>>>> also configure the timeout. 3 seconds is a good choice
>>>>
>>>> have fun
>>>> Banana
>>>>
>>>>
>>>> On Apr 7, 2010, at 5:41 AM, Abu Abdulla alhanbali wrote:
>>>>
>>>>> Hi,
>>>>>
>>>>> i would like to know how long it will take the secondary DHCP server
>>>>> to start assigning IPs for all users (including the ranges dedicated
>>>>> to the primary) in case the primary DHCP is down? is it a
>>>>> configurable?
>>>>>
>>>>> i would like also to ask if the DHCP can handle 200K users or above
>>>>> assuming the H/W is capable and the lease time is big enough (more
>>>>> than one week). is it recommended to run multiple instances or let one
>>>>> instance handle this number.
>>>>>
>>>>> thanks
>>
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>
>
> --
> regards,
> -glenn
> --
> Glenn Satchell                            |  Miss 9: What do you
> Uniq Advances Pty Ltd, Sydney Australia   |  do at work Dad?
> mailto:glenn.satchell at uniq.com.au         |  Miss 6: He just
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