Re: Active/Active configuration

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Well, Component NLB is a hybrid...but yes, another fun one to dive into.

Replication in NLB I just meant that each Web Server (or Application Server
in the case of Component NLB) has an exact copy of the code: each provides
the same service.

The only place I've seen Clustered Server Federations (with Replication to
boot) is in the WSSRA (and the older EDC and IDC MSSRA) documentation, which
are very good about deploying entire data centers and describing the gamet
of available technologies.

http://www.microsoft.com/technet/solutionaccelerators/wssra/raguide/default.mspx

Sincerely,


Anthony Thomas


--

"Russ Kaufmann [MVP]" <russ@xxxxxxxxxxxxxxx> wrote in message
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"Anthony Thomas" <ALThomas@xxxxxxxxx> wrote in message
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There are Failover cluster (which is the type SQL Server uses), Compute
clusters (which aggregate computing resources to solve a single
solution),
and then there is Network Load Balancing (which SQL Server cannot use).

and there is also component load balancing, but let's save that for
another
day...<G>

However, SQL Server does provide a mechanism to distribute DBMS load
across
a group of servers. This is called a Server Federation. However, the
data
is not replicated across systems like it would be for a NLB web site

Data is not replicated in an NLB web site. NLB has nothing to do with
keeping data in synch.

; it is
partitioned, with the queries being routed to the particular partition
that
contains the requested data. Through the use of Data Dependent Routing,
the
coding of the application to determine this redirection has been
simplified.

Yet, again, this is not a function of MSCS clustering. This is an
application function.

Now, here is a got-cha. Each server that participates in a Server
Federation could also be a member of Failover Server Cluster. Chew on
that
one for a while.

Nothing to chew on. This has been discussed several times in this
newsgroup.
It is not a cluster function, it is an application function. It also, from
my understanding, is a real tough one to deploy. Have you done it? I would
love to see an example.

--
Russ Kaufmann
MVP - Windows Server - Clustering
ClusterHelp.com, a Microsoft Certified Gold Partner
Web http://www.clusterhelp.com
Blog http://msmvps.com/clusterhelp

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