UPS Exchange
The Teneros Application Continuity Appliance (ACA) acts as a sort of uninterruptible power supply (UPS) for Exchange servers. (See SMBs Balk at Backup.)
The ACA sits between the Exchange Server and the network backbone, and replicates data to provide failover in case the server goes down. This keeps Exchange up and running. If there was a delay in your last backup, ACA can failback to data replicated since the last backup so no data is lost. But you need one ACA for each Exchange server, so this is primarily limited to SMBs and departments rather than large enterprises.
Prepare for Exchange 2007...
That means be ready to upgrade hardware. First, you'll need 64-bit servers to run it. You'll also likely need more disk.
Keith McCall, CTO of Exchanged managed server provider Azaleos, says Exchange 2007 will comfortably support 6,000 users per server, compared to 2,500 per server with Exchange 2003. But to take advantage of more users per server, you will need a lot more capacity. Take 6,0000 users at, say, 1 gig per user, and that comes to 6 Tbytes of usable storage.
"If you want to RAID 10 or RAID-DP it, you need 12 Tbytes and you have to reserve twice that if you want to recover in case of a disaster," McCall says. "The numbers start getting staggering."
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