HP 3PAR VMware ESX Implementation Guide

The maximum number of LUNs on a single ESX HBA port is 256, and there are 256 total LUNs
on the ESX host. Internal devices, such as local hard drives and CD drives, are counted as a LUN
in the ESX host LUN count.
Removing Volumes
After removing a VLUN exported from the HP 3PAR StoreServ Storage, perform a ESX host bus
adapter rescan. ESX will update the disk inventory upon rescan. This applies to both FC and iSCSI.
Figure 42 Rescanning the ESX Host
You should remove the disk/LUN from the virtual machine inventory, detach from the ESX host,
and then remove it from the HP 3PAR StoreServ Storage using the removevlun and removevv
HP 3PAR OS CLI commands or using the HP 3PAR Management Console. If a LUN is not detached
but is removed from the HP 3PAR StoreServ Storage, it appears as a device in an error state, and
is cleared after an ESX host reboot.
Figure 43 Detaching a LUN
Removing Volumes 77