HP EliteBook 8770w RAID User Guide - Page 6

RAID technology overview, RAID terminology - memory

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2 RAID technology overview This chapter defines the terms used in this guide and describes the RAID technologies supported by select HP Business computers. RAID terminology Some of the terms in the following table have a broader meaning, but they are defined in relation to the RAID implementation described in this guide. Term Fault tolerance HDD Option ROM Primary drive RAID array RAID migration RAID volume Recovery drive Reliability Stripe Striping SSD (solid-state drive) SED (self-encrypting drive) mSATA module Definition The ability of the computer to continue to operate if one drive fails. Fault tolerance is often used interchangeably with reliability, but the two terms are different. One physical hard disk drive in the RAID array. A software module inside the system's BIOS that provides extended support for a particular piece of hardware. The RAID option ROM provides boot support for RAID volumes as well as a user interface for managing and configuring the system's RAID volumes. The main internal hard drive in the computer. The physical drives that appear as one logical drive to the operating system. The change of data from a non-RAID to RAID configuration. "RAID level migration," or the change of data from one RAID level to another, is not supported. A fixed amount of space across a RAID array that appears as a single hard drive to the operating system. The hard drive that is the designated mirror (copy of the primary) drive in a RAID 1 and Recovery volume. The likelihood-over a period of time-that a hard drive can be expected to operate without failure, also known as mean time before failure (MTBF). The set of data on a single hard drive in a RAID volume. The distribution of data over multiple disk drives to improve read/write performance. A solid-state drive is a flash-based or DRAM-based hard drive with no rotating media. A self-encrypting drive is a hard drive that uses hardware encryption to protect the data on the drive. An mSATA module is a flash-memory module with an mSATA connector. 2 Chapter 2 RAID technology overview

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2
RAID technology overview
This chapter defines the terms used in this guide and describes the RAID technologies supported by
select HP Business computers.
RAID terminology
Some of the terms in the following table have a broader meaning, but they are defined in relation to
the RAID implementation described in this guide.
Term
Definition
Fault tolerance
The ability of the computer to continue to operate if one drive fails. Fault tolerance is
often used interchangeably with reliability, but the two terms are different.
HDD
One physical hard disk drive in the RAID array.
Option ROM
A software module inside the system's BIOS that provides extended support for a
particular piece of hardware. The RAID option ROM provides boot support for RAID
volumes as well as a user interface for managing and configuring the system's RAID
volumes.
Primary drive
The main internal hard drive in the computer.
RAID array
The physical drives that appear as one logical drive to the operating system.
RAID migration
The change of data from a non-RAID to RAID configuration. “RAID level migration,” or
the change of data from one RAID level to another, is not supported.
RAID volume
A fixed amount of space across a RAID array that appears as a single hard drive to the
operating system.
Recovery drive
The hard drive that is the designated mirror (copy of the primary) drive in a RAID 1 and
Recovery volume.
Reliability
The likelihood—over a period of time—that a hard drive can be expected to operate
without failure, also known as mean time before failure (MTBF).
Stripe
The set of data on a single hard drive in a RAID volume.
Striping
The distribution of data over multiple disk drives to improve read/write performance.
SSD (solid-state drive)
A solid-state drive is a flash-based or DRAM-based hard drive with no rotating media.
SED (self-encrypting drive)
A self-encrypting drive is a hard drive that uses hardware encryption to protect the data
on the drive.
mSATA module
An mSATA module is a flash-memory module with an mSATA connector.
2
Chapter 2
RAID technology overview