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pshell get-esxtop for storage adapter information

This script pulls adapter IO information and latency figures via ESXtop per ESX host.   This was typically done from each ESX server console or from the vMA to understand storage performance for sizing and troubleshooting.  This script will now allow the collection to be performed centrally from powershell.  All native figures that come from the adapters and scsi devices are available.

See screenshots and inside script for examples of running.

1/1/11 updated to include latency and bandwidth figures for LUNs

1/2/11 fixed calculation bugs for vmhbas and cleand up

1/2/11 added VAAI metrics and examples

1/2/11 added VAAI screenshots

2/20/11 updated script

2/28/11 updated for csv output related changes

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