HP 3PAR VMware ESX Implementation Guide

The maximum number of LUNs on a single ESX HBA port is 256, and 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 (Figure 42 (page 79)). This applies
to both FC and iSCSI.
Figure 42 Rescanning the ESX Host
It is advisable to 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 79