Generally speaking, assuming that all three servers have similar performance requirements and you do not have very...
many disk drives, you would create a single RAID group/set, create multiple LUNs, and then assign the LUNs to the various servers. A word of caution: This is a very generic rule of thumb based upon a few assumptions, including very few available disk drives and servers with low performance criteria. If you have enough disk drives, you can create multiple RAID sets and one or more LUNs and map those to the different servers. What you will want to be careful of is balancing the I/Os of the different servers across the different RAID groups and LUNs to avoid contention of the LUNs and disk drives.
Regardless of whether you create one large RAID set or multiple RAID sets, you will need to create at least one LUN per server and more likely multiple LUNs depending upon your application requirements. You might want to also look at the HP StorageWorks Web site if you have not already done so to view some of the MSA1000 configuration and RAID material for specific details.
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