How about all 20,000 users data on a (mirrored) SAN that is also hosting the
OS, so that the actual servers need only have a pair for the swap file. As
soon as a server goes belly-up, just flick on another one that boots off the
same LUN in the SAN?
I expect you could actually script this to happen automatically. EMC for
instance claim to do something very similar.
You'd then just need 4 Servers (not even Advanced) and one or two identical
spares.
Of course the SAN itself isn't going to be cheap, especially from EMC!
Mark
-----Original Message-----
From: Robert Ellis [mailto:[EMAIL PROTECTED]]
Sent: 07 September 2001 15:03
To: Exchange Discussions
Subject: clustering
Just something I've been thinking about:
Assume 20,000 users. Ignoring storage needs for a moment:
8 boxes of Datacenter give you 2 x 4-node clusters, 6 active, 2 passive,
hosting roughly 3334 users each. (25% hot standby)
8 boxes of Advanced Server give you 4 x 2-node clusters, 4 active, 4
passive, hosting 5000 users each. (50% hot standby)
To achieve the same user load figures on AS as for Datacenter you need an
extra 4 boxes, a total of 12.
I wonder how the cost of 4 extra boxes compares to the Datacenter support
costs??
Regards,
Rob Ellis
Messaging Consultant
Service Delivery Solutions & Programmes
IBM Global Services
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