From: Ellen K. 

I am so ignorant about this stuff.  Would that still work if the servers
are in different cities?   (I suspect my boss is going to want to have
the redundancy between LA and TJ.)

For that matter, if we went with clustering, would clustering work on
servers in different cities?

On Tue, 31 May 2005 08:36:15 -0400, Mike N. 
wrote in message :

>On Mon, 30 May 2005 23:40:14 -0700, Ellen K. 
>wrote:
>
>> It did occur to me that since we have static routing (I think), just
>>assigning a new IP address might not be enough.  Is an "ARP
table" where
>>the routing instructions live?  Would new instructions get added
>>automatically?
>
>  The "ARP table" is the IP address - to - Ethernet Hardware address
>translation table that contains all ethernet hardware addresses on your LAN
>segment.  It is created automatically by each host on TCP/IP as you
>communicate with anything else.
>
>   One way to eliminate the user complexity of IP switchover is to put a
>'traffic director' device in front of the 2 servers.   The device would
>detect a timeout / lack of response from the primary and automatically
>switch to backup.   Normally these are used for web servers for redundancy
>to one or more web servers from a single IP.  They may require a special
>configuration or manual failover to work for SQL server in your
>application.   But upon further thought - if you are using manual failover,
>the same thing would be accomplished by a simple router in front of the 2
>servers.

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