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Avago Technologies

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12Gb/s MegaRAID SAS RAID Controllers User Guide

February 2015

Glossary

hot spare

An idle, powered on, standby drive that is ready for immediate use in case of drive failure. A hot spare does not contain any user

data. A hot spare can be dedicated to a single redundant array or it can be part of the global hot-spare pool for all arrays managed

by the controller.

When a drive fails, the controller firmware automatically replaces and rebuilds the data from the failed drive to the hot spare. Data

can be rebuilt only from virtual drives with redundancy (RAID levels 1, 5, 6, 10, 50, and 60; not RAID level 0), and the hot spare must

have sufficient capacity.

internal SAS device

A SAS device installed inside the computer cabinet. These devices are connected by using a shielded cable.

main memory

The part of computer memory that is directly accessible by the CPU (usually synonymous with RAM).

NVSRAM

Acronym for nonvolatile static random access memory. An EEPROM (electronically erasable read-only memory) chip that stores

configuration information. See EEPROM.

PCI

Acronym for peripheral component interconnect. A high-performance, local bus specification that allows the connection of devices

directly to computer memory. The PCI Local Bus allows 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 permits 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 allow concurrent data transmission in both the receive and the

transmit directions.