Network topology for Small Business HA - Clustering?

Less than 20 person engineering firm. Have needs for:
2+ Terabytes of local data storage
Email serving with local control
Shared Internet access with VPN capabilities
Printer sharing

To date we have used SBS 2003 to fill this need nicely but after a
recent hardware failure and too much downtime, management decided to
invest in a more highly available option. We decided to go with
windows clustering and purchased 2 identical machines from Dell with a
shared storage unit, Windows Server 2008 Enterprise and Exchange
Server 2007 standard.

Now through my search for recommended configurations I find it
confusing on how I need to have this setup. It is not recommended to
cluster domain controllers and Exchange clustering on DMs does not
seem to be supported. I need to find a resource that addresses my
network topology to accomodate a highly available environment from ISP
to end users. Is there a recommended resource for network layouts for
our scenario? Would a Primary/Secondary domain controller with a
hardware fault tolerant NAS be more what we should be doing?

Any direction would be appreciated.
Thanks,
Joel
.

Relevant Pages

  • Network topology for Small Business and High Availability
    ... 2+ Terabytes of local data storage ... Email serving with local control ... Shared Internet access with VPN capabilities ... cluster domain controllers and Exchange clustering on DMs does not ...
    (microsoft.public.windows.server.active_directory)
  • Re: local quorum and drive Q
    ... Do the Adaptec 2120S raid cards also control one or more internal drives? ... Clustering makes sure that external disks are really external. ...
    (microsoft.public.windows.server.clustering)
  • Re: Understanding storage clustering
    ... A Server Cluster is not something that you throw together or wing it during the build process. ... means only one node can control a resource at one time. ... It certainly will not work with Windows server clustering, and SAMBA does not provide a disk locking mechanism like would be required to get what you are trying to do. ...
    (microsoft.public.windows.server.clustering)
  • Re: Configuring an optical library under Windows 2003 clustering
    ... Microsoft clustering is known as a shared nothing model. ... time will control the library. ... > for use under MS Cluster Server. ...
    (microsoft.public.windows.server.clustering)