HP 3PAR Solutions Software for vSphere - Manual (Page 30)

4.4 Installation Error Messages
3PAR VAAI Plug-in 1.1.0 for VMware vSphere 4.1 Users Guide
MESSAGE
3parvaai:ERR 3PAR_vaaip_InServ has already been loaded. Please unload
the module and reboot ESX host before you reinstall 3PAR VAAI Plug-in
package
DESCRIPTION
The 3PAR VAAI Plug-in module 3PAR_vaaip_InServ has already been loaded.
SUGGESTED ACTION
Remove the existing 3PAR VAAI Plug-in package, reboot the ESX/ESXi host, then re-install 3PAR
VAAI Plug-in 1.1.0 for VMware vSphere 4.1 again.