User guide

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I/O Input / Output
ISP Intelligent SCSI Processor. Intelligent interface protocol chip
JBOD Just a Bunch of Disks. A firmware/hardware implementation of a
disk array in which data is stored without RAID, or perhaps with a
minimal subset of RAID such as mirroring
Logical Unit Number-
ing (LUN)
A SCSI representation of a system drive on a given channel and
target ID
LUN mapping A process whereby LUNs are mapped to system drives
Master / Slave Dual-active systems do not really have a master controller and a
slave controller, however, the term master identifies C0, or the pri-
mary controller; the term slave identifies C1 or the secondary con-
troller
Partner controller The other controller in a dual-active controller pair
PCB Printed Circuit Board
PON Power ON. A condition where the controller detects +5V power
has reached a level suitable for operation
Primary/Secondary
Controller
See Master / Slave
RAID Redundant Array of Independent Disks. A firmware/hardware
implementation of a disk array controller in which data is stored
on disks in such a manner as to improve performance and avoid
data loss if a disk drive fails
SES SCSI-3 Enclosure Services. Provides a means of SCSI access to
multiple devices within an enclosure
Term Description