Compaq 4200 Family - Manual (Page 51)

GL–2 Enclosure 4200 Family LVD Disk Enclosures User Guide
drive blank A carrier that is required to control airflow within the enclosure whenever
there is less than a full complement of disk drives in an enclosure. The
only function of a passive drive blank is to control airflow within the disk
enclosure.
dual power See redundant power configuration.
element An object in an enclosure such as an EMU, power supply, disk, fan, I/O
module, and so forth. The object can be controlled, interrogated, or
described by the enclosure services process.
EMU Environmental monitoring unit. An element which monitors the status of
an enclosure including the power, air temperature, fan status, and so forth.
It detects problems and displays and reports these conditions to the user
and the controller. In some cases, corrective actions are implemented.
enclosure A chassis containing a set of disk drives, power supplies, fans, an EMU,
I/O modules, and so forth.
fan An airflow element mounted in a StorageWorks enclosure.
host The primary or controlling computer (in a multiple computer network) to
which storage is attached.
hot-pluggable An element that can be replaced without removing power from the
enclosure.
CAUTION: If removing the element interrupts the SCSI bus you
cannot use this method. You must quiesce the bus and use the
pluggable replacement method.
NOTE: The array controller must support this replacement method.
I/O module An element that integrates the enclosure bus with either an 8-bit
single-ended, 16-bit single-ended, or 16-bit differential SCSI bus.
LED Light emitting diode. A diode that illuminates to define the status. The
standard states are O
N , O FF , or F LASHING .