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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
A piece of hardware (such as a video monitor, drive, printer, or CD‐ ROM) used with a
devices
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
adapter that provides the backbone of both server and high-end workstation environments.
Each port on the SAS RAID adapter supports SAS devices, SATA II devices, or both.
SAS device
Any device that conforms to the SAS standard and is attached to the SAS bus by a SAS cable.
This includes SAS RAID adapters (host adapters) and SAS peripherals.
SATA
Acronym for Serial Advanced Technology Attachment. A physical storage interface standard,
SATA is a serial link that provides point-to-point connections between devices. The thinner
serial cables enable better airflow within the system and permit smaller chassis designs.
SATA
Glossary
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