LUN Sizing VMFS 5

I have a new vsphere 5 environment comprising of 3 esxi5 nodes and will be getting a new 45 tb EMC SAN soon. Sorry I don't have much info about SAN. All I have been told is that we will have mix of fc and sata drives but due to SSDs performance will be same across all 11 TB that I will get for my VMware. I will need to migrate about 70 VMs from current 4.1 live cluster. VMs are a mix generally 2003/2008 app/web/exchange servers with no exceptional requirements. No file servers as well. Its difficult to group my current vms based on their performance requirements.Would someone be able to advice how many VMFS Luns I should go for and what size?
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Brad BouchardInformation Systems Security OfficerCommented:
Here is what I do:

I create several LUNs for just OS/System (C drives in Windows) drives for my VMs and several  LUNs for just data.  That way I can not only keep the VMDKs separate, but if an entire datastore/LUN goes down it doesn't take out all of my servers capabilities.  I would try to do something similar.
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
we would create 500-800GB LUNs, with 5-6 VMs per LUN
Brad BouchardInformation Systems Security OfficerCommented:
I also forgot to mention that I have thresholds for size limits on each LUN.  What I mean by this, is that I thin provision new hard disks for the VMs and when the provisioned space reaches a certain % (usually 65-75%) I stop putting VMs on that LUN/datastore.  So if I have OS1 at 75% of capacity I create a new LUN/datastore called OS2.  Hope that helps.
I would create LUNs @ 1-2TB and about 10-15 VMs per LUNs

LUNs are created for different needs.

For example,

1) LUN#1 - VM-LUN1-SAS (On SAS disks - high IO required VMs)
2) LUN#2 - VM-LUN2-SAS (On SAS disks - high IO required VMs)
3) LUN#3 - VM-LUN3-SAS-D (On SAS disks - high IO required VMs with Storage Deduplication/Compriession  enabled)
4) LUN#4 - VM-LUN20-SATA (On SATA disk - Low IO required - DEV or TEST VMs) on

Hope above info helps.

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