Exchange 2010 DB setup

We're looking at upgrading from a 2003 environment to 2010.  The biggest question has been our DB.  Microsoft Exchange Teams Mailbox Size Calculator was giving us numbers that we can't support as far as storage is concerned.  That being said, the MS calculator takes into account storage over the lifecycle of Exchange 2010.  

Our storage solution is a little different and I need to approach it differently.  First, we currently don't have enough storage allocated for what the calculator suggests.  Secondly, we only have a 45 day retention and then Enterprise Vault archives anything after that.  So at any given moment, our TOTAL DB size is around 1.4 TB.  That's 6200 active users with around 50-60 emails @ 130KB per day.

We would like to add some overhead for some growth that we can't account for, but 23-24 TB is a bit much (MS Exchange Mailbox Calc).  I have allowed for 100% growth across 3 MBX servers in my design.  That's 30 DBs at 90 GB per DB.  Does anyone think this is adequate?  We can grow our storage in the future, but for now I'm only allocated 30x 146GB drives in our Fiber Channel SAN.  That storage has to cover everything from the VMs (3 CAS/HUB and 3 MBXs), the logs, and DB storage.

Can I get away with that setup?
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liquid101Asked:
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Paul SolovyovskyConnect With a Mentor Senior IT AdvisorCommented:
EV should have you covered since it will do Single Instance, compression, and shared vaults.

Typically compression is 50% and you can use SATA storage since it's mostly data at rest.

Figure out what your annual growth is on 2003, this will be similar to 2010 since it's on the system for 45 days you should calculate what type of compression you're getting and go from there.

With vault partition rollover you can define the how much and where the storage goes.

It also may be a good idea to talk to you legal counsel if you don't have expiry set up to delete old vaults.  If you do then the space should start clearning up after a expiry kicks in and thus free up space for additional archives.

You'll need to upgrade to EV9 before you rollout EX2010
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liquid101Author Commented:
Thanks.  I think we have our design now. (FINALLY)
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