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Cannot increase data store

The SAN volume was expanded from 2 TB to 4TB so we could increase the data store.  A scan was performed on the storage adapters and it recognized the added 2TB of space.  However, when we tried to increase the data store the device was not available to choose for expansion.  What do I need to do to see the LUN and expand the data store?  

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pjam
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What version of ESXi?  I learned the hard way ESXi 4 has a 2TB limit
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5.5
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You should see he additional size in the LUN window.

something is no recognising the expanded LUN.
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It appears the iSCSI adapters can see the added space but it does not allow me to add it.
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For whatever reason, after the host ESXi servers were rebooted, the data store was able to see the additional space and add it.
That is very odd.

Is your SAN on the VMware HCL.

I would ask the SAN vendor.

This should be "plug and play"
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It is a Dot Hill DH3320 SAN.  This task has been done several times in the past with the same SAN.
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Andrew Hancock (VMware vExpert PRO / EE Fellow/British Beekeeper)
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Dot Hill explained that the SAN and the host were not seeing eye to eye in terms of LUN's.  They said the logs indicated that the LUN was originally named LUN 0 but was later renamed LUN 1 but never was restarted/reset to accept those changes.