Unity Failover Design in MAN Environment

[calmichael]

It seems that the design guides require that Unity

and Exchange be colocated in the same VLAN and

Layer 3 IP subnet.

The situation a client wants to have explored is to

relocate the Unity failover server to another campus

buildling to overcome disaster recovery topics that

are associated with single building designs.

The links between buildings are 10GE (redundant) with

peak bandwidth reaching 15% and latency below 10ms.

This is a Unity-VM 4.0(4) deployment, voicemail only

with off-box Exchange 2003.

If only the Unity failover server was to be relocated

or built new at a 10GigE connected site, would this

still be considered as a supported design? Note that

Exchange would still be in the original building and

would not be present at the failover building though

plans may change to include additional Exchange

servers throughout the campus. A CCM server that is

part of the same cluster as the original building

would be present at the failover building location.

--- Thanks ---

[kechambe]

The bandwidth levels you have are much more that what we require for support. The requirement is 45 mbps or more and for it to be considered the same LAN. The 'Cisco Unity Deployment and Solutions Guide' book is a pretty large section on this. It's worth reading.

Keep in mind that Exchange 2003 is not supported for voicemail only, even if it is off box. There are some technical issues when Unity is deployed as VM with Exchange 2003 that will affect system performance. Until they are all resolved only Exchange 2000 is supported.

Thanks,

Keith