Re: Failover for business continuity

[Ram <ram@xxxxxxxxxxxxx>]

On 05/30/2012 12:43 PM, Dmitry Banschikov wrote:
> On 05/30/2012 10:52 AM, Ram wrote:
>> I am trying to setup a remote cyrus-replica to a different geographical
>> location for business continuity.
>>
>> In case the main server goes down the users will get switched to the
>> remote server by making a DNS change.
>> The only issue is DNS replication would take a long time so the switch
>> is not instantaneous.
>> How would one make the switch instantaneous ? Moving the IP is not
>> possible because the Remote server is on a different network
>>
>>
>
> You can set TTL of RR to very small value (say 60 seconds). In this 
> case, DNS change will be propagated fast.
>
>
But I have seen some DNS clients , especially on windows , do not honor 
TTL.
For a 10 minute TTL , even after 4 hours the windows server keeps 
resolving to the old server




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