Is this even possible...if so advice??

Hi Everyone,
So I need to tap into the great knowledge of others on here and see if anyone has either some advice or maybe recommended resources to check on this question.
I am setting up a small business with a Mac Mini Server and my client asked me if there was anyway to set it up to have basically a redundant server going that would take over for the main one should it go down to something that required repair, like a logic board issue.
I know in large enterprise situations they have server farms setup and you can configure a setup that monitors the other units and will setup to the plate if that unit goes down automatically.
I know Snow Leopard Server doesn't have anything built-in (to my knowledge) that makes this happen, but does anyone have an idea of if/or how I could accomplish this? Say if I had one Mac Mini Server as the main unit and the second one waiting in the wings so to speak. I figured an easy way just to have a cloned unit sitting there, but it is the whole automatic aspect.
If anyone has any suggestions, advice or resources I can dig into I would really appreciate it. I would also appreciate if your response is they are bat sh*t crazy and there is no way to do this without stepping up to Xserve-land.
Thanks!

I know Snow Leopard Server doesn't have anything built-in (to my knowledge) that makes this happen
Fortunately, you're mis-informed.
Mac OS X Server has had automatic failover abilities for some time now.
You'd need two machines and each one listens for a heartbeat from its partner system. If the heartbeat fails it's assumed that the other system is offline and the failover daemon starts up whatever services you have configured to failover.
The three main issues are:
1) implementing a heartbeat network between the two machines (ideally on a separate network link, which could be FireWire)
2) determining which services should failover (it's unlikely that you need/want all services to failover since there is a cost of failover (and an even bigger cost of fallback))
3) Managing common storage elements - how to make sure both machines have the same content. For example, if you determine that you want to failover your web server you need to make sure that both machines have access to the same web content, otherwise your site will look different in a failover situation. This grows exponentially if you have a dynamic, database-driven web site since you need to consider database replication as well.
Note that 3 may be partly solved via network storage that's accessible to both machines, however you need to consider the case where the network storage fails...

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Hi,
Please check if DFS Replication filter some special file from replication. For more detailed information, please refer to the article below:
Exclude files or subfolders from replication
http://technet.microsoft.com/en-us/library/cc758048(v=ws.10).aspx
If the issue still exists, please create a Diagnostic Report to see if there is any error message.
Create a Diagnostic Report for DFS Replication
http://technet.microsoft.com/en-us/library/cc754227.aspx
Best Regards,
Mandy
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We are currently have a solution that allows us to use a campus RADIUS
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Cheers,
Steve
On Thu, 23 Feb 2006 15:50:11 GMT, [email protected] wrote:
>Michael,
>
>Thanks for the info. I really wasn't sure where to post this question. I
>really wasn't sure if I needed to be using Novell's RADIUS server or not to
>do this. Reading the online docs didn't really help me to know which
>solution or solutions to choose.
>
>-=Bryan
>
>> [email protected] wrote:
>>
>> > Is this even possible?
>> >
>> > So, essentially, we would like the external RADIUS' user/password data to
>> > be synced with the eDirectory data, but have the eDirectory receive updates
>> > from the RADIUS (or LDAP, Kerberos or whatever system is necessary). Or is
>> > an all-Novell solution the only possible way to use RADIUS authentication?
>>
>> What you want should be possible with Novell Identity Manager (formerly
>> DirXML) product. This particular forum is for help with the NetWare
>> Radius server, which would not factor into what you are trying to
>> accomplish... you have a non-Novell Radius server that you want to sync
>> eDirectory information with, and that is the realm of identity manager.
>>
>> As to the "hows", you might as in the nsure-identity-manager group here.
>>
>> --
>> Jim
>> NSC SYsop

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http://img526.imageshack.us/img526/7306/screenshot20110105at105.png
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Is this even possible...if so advice??

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