HP StorageWorks 2000 Series Reference Manual page 142

Each controller module and expansion module contains an Expander Controller
(EC). The storage system can query EC for information about enclosure
environmental conditions such as temperature, power supply and fan status, and the
presence or absence of disk drives. The system can also communicate information
to the EC about RAID activities such as disk drive rebuilds and failed disk drives.
The EC is also referred to as the enclosure management processor (EMP).
You can view enclosure status information from the following SMU pages:
Monitor > Status > Enclosure Status. See "Enclosure Status" on page 161 for
more information.
Monitor > Status > Module Status. See "Module Status" on page 159 for more
information.
Manage > General Config > Enclosure Management. See "Using Enclosure
Management Pages" on page 142.
System Panel at the bottom of every page. See "System Panel" on page 26 for
more information.
The enclosure view shows enclosures in order by enclosure ID value, with the
lowest value at the top.
On Enclosure Management pages you can perform the following tasks:
View enclosure details
Enter information to identify an enclosure
Illuminate an LED to locate an enclosure
Change the EMP poll rate
Reorder enclosure IDs