User Manual

Glossary
224 Enterprise Virtual Array 3000 User Guide
param
That portion of the HSV controller termination code display that defines:
■ The 2-character parameter identifier that is a decimal number in the 0 through 30 range.
■ The 8-character parameter code that is a hexadecimal number.
See also IDX and TC.
password
A security interlock where the purpose is to allow:
■ A management agent control only certain storage systems
■ Only certain management agents control a storage system
PDM
Power Distribution Module. A thermal circuit breaker equipped power strip that distribute
power from a PDU to Enterprise Storage System elements.
PDU
Power Distribution Unit. The rack device that distributes conditioned AC or DC power within
a rack.
petabyte
A unit of storage capacity that is the equivalent of 2
50
, 1,125,899,906,842,624 bytes or 1,024
terabytes.
physical disk
A disk drive mounted in a disk drive enclosure that communicates with a controller pair
through the device-side Fibre Channel loops. A physical disk is hardware with embedded
software, as opposed to a virtual disk, which is constructed by the controllers. Only the
controllers can communicate directly with the physical disks.
The physical disks, in aggregate, are called the array and constitute the storage pool from
which the controllers create virtual disks.
physical disk array
See array.
port
A Fibre Channel connector on a Fibre Channel device.
port_name
A 64-bit unique identifier assigned to each Fibre Channel port. The port_name is
communicated during the login and port discovery processes.