Table of Contents
Advertisement
G l o s s a r y
HDD Module Backplane
A series of small circuit boards on the back of the hard disk module. They
are connected together by a SCSI interface cable and are semi-rigid to
help overcome excessive vibration that can sometimes occur. All hard
disks in the server are connected to the module backplane.
Hot Pluggable
A term which refers to the ability to remove and fit a hard disk drive
easily without switching the server off. The technology involved in this
feature prevents the loss of data stored on a drive which might need
replacing.
Knockout Panel
A small metal blanking panel which covers the centre spine opening for
the hard disk module data connector. This panel must be removed when a
module is installed for the first time in the server's hard disk chamber.
On-line Battery Pack
The removable part of the Uninterruptible Power Supply which maintains
power to the system when a power failure occurs. Under normal
conditions the mains electricty keeps the battery pack fully charged, even
when the system is switched off. There is enough power in the battery
pack to keep a fully laden system (i.e equipped with 20 hard disk drives)
operational long enough to shut the server down. With fewer drives this
operation time will be longer.
Power Distribution Board
A special circuit board which distributes power from a single source, i.e.
the power supply unit, to several components. For example, the power
distribution board at the top of the electronics bay draws power from the
UPS and distributes it to the motherboard and associated components.
RAID
An acronym that stands for Redundant Arrays of Independent Disks. This
technology provides a high level of data safety and integrity by enabling
the storage of the same data on more than one hard disk. It then manages
the data in such a way as to prevent data loss if one hard disk should fail
or become corrupted.
Removable Media Drives
Refers to drives whose storage media are removable from the drive itself.
Typical examples are floppy disk, CD-ROM and tape backup drives.
G-2 OWNER'S HANDBOOK
Advertisement
Table of Contents
