SAS
N
NVRAM
Acronym for nonvolatile random access memory. An EEPROM (electronically erasable read-
only memory) chip that stores configuration information. Refer to EEPROM.
O, P
PCI
Acronym for peripheral component interconnect. A high-performance, local bus specification
that enables the connection of devices directly to computer memory. The PCI Local Bus
enables transparent upgrades from 32-bit data path at 33 MHz to 64-bit data path at 33 MHz,
and from
32‐
bit data path at 66 MHz to 64-bit data path at 66 MHz.
PCI Express
Acronym for Peripheral Component Interconnect Express. A
high‐
performance, local bus
specification that enables the connection of devices directly to computer memory. PCI Express
is a two-way, serial connection that transfers data on two pairs of point-to-point data lines. PCI
Express goes beyond the PCI specification in that it is intended as a unifying I/O architecture
for various systems: desktops, workstations, mobile, server, communications, and embedded
devices.
peripheral
devices
A piece of hardware (such as a video monitor, drive, printer, or
CD‐
ROM) used with a
computer and under the control of the computer. SCSI peripherals are controlled through a
MegaRAID SAS RAID controller (host adapter).
PHY
The interface required to transmit and receive data packets transferred across the serial bus.
Each PHY can form one side of the physical link in a connection with a PHY on a different
SATA device. The physical link contains four wires that form two differential signal pairs.
One differential pair transmits signals, while the other differential pair receives signals. Both
differential pairs operate simultaneously and enable concurrent data transmission in both the
receive and the transmit directions.
Q, R, S
SAS
Acronym for Serial Attached SCSI. A serial, point-to-point,
enterprise‐
level device
interface that leverages the proven SCSI protocol set. The SAS interface provides improved
performance, simplified cabling, smaller connections, lower pin count, and lower power
requirements when compared to parallel SCSI. SAS adapters leverage a common electrical
and physical connection interface that is compatible with Serial ATA. The SAS adapters
support the ANSI Serial Attached SCSI Standard, Version 2.0. In addition, the adapter supports
the Serial ATA II (SATA II) protocol defined by the Serial ATA Specification, Version 1.0a.
Supporting both the SAS interface and the SATA II interface, the SAS adapter is a versatile
Glossary
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