Appendix A : Glossary

The terms used on the Universal RAID Utility are listed in the tables below.

Basic Terms on RAID System

RAID System

Term

RAID Controller

Physical Device

Disk Array

SSD Cache Disk Array

Logical Drive

SSD Cache Drive

Hot Spare

Global Hot Spare

Dedicated Hot Spare

Battery

Flash Backup Unit

Cache Memory

Enclosure

Fan Unit

Power Supply Unit

Description

The RAID System has the ability of using hard disk drives in a computer as Disk Arrays.

The RAID System handles a single RAID Controller as a single system.

The RAID Controller can use hard disk drives as Disk Arrays.

Physical Devices are used by a RAID System. Physical Devices mean hard disk drives or

SSD (Solid State Drive). Physical Devices can be other than hard disk drives if the RAID

Controller can connect with devices other than hard disk drives.

Universal RAID Utility displays "PD" as Physical Device too.

The virtual hard disk space is created by some Physical Devices. So, you cannot see

Disk Array on operating system. You can create Logical Drive on Disk Array.

The Disk Array that is configured with SSD Cache Drive.

The virtual hard disk drive is created on a Disk Array to be recognized by operating system. A specific RAID Level should be set for each Logical Drive.

Universal RAID Utility displays "LD" as Logical Drive too.

The virtual cache drive is created on an SSD Cache Disk Array. The SSD Cache Drive operates as the Cache of Logical Drive.

Hard disk drives of the type are prepared previously to be replaced with a Physical

Device in which a failure occurs.

Available as a Hot Spare of any Disk Array in a single RAID Controller.

Available as a Hot Spare of a specific Disk Array in a single RAID Controller.

The battery is intended to hold the information on the cache memory in a RAID

Controller if the power supplied to the RAID Controller is interrupted.

Transfers the cache of the RAID Controller to the flash memory to keep the information safe when the power to the RAID Controller is cut off.

The cache is intended to improve the I/O performance of a RAID Controller.

Means a module equipped with slots to which Physical Devices are inserted.

Means a cooling fan unit installed in an enclosure.

Means a power unit supplying power to an enclosure.

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Basic Terms on Functions of RAID System

Operation

Configuration

Start Initialize

Start Rebuild

Term

Start Consistency Check

Patrol Read

Cache Mode

Make Online

Make Offline

Buzzer

HDD Power Saving

Refresh Battery

Description

Generic term of maintenance functions requiring certain periods for executions such as

Rebuild and Consistency Check

Means the configuration of a RAID System.

Initializes management area and data area of the Logical Drive.

Writes the data in a failed hard disk drive into a new hard disk drive replaced to Rebuild the Logical Drive.

Reads all sectors on hard disk drives configuring a Logical Drive to verify the data or provide parity check.

Reads all sectors on hard disk drives in a RAID System to check whether errors occur or not.

Indicates the mode in which data is written into the cache memory in a RAID Controller.

Means that a Physical Device is entered into the Online status manually.

Means that a Physical Device is entered into the Failed status manually.

Indicates a Buzzer installed in a RAID Controller. The Buzzer notifies you of occurrence of a failure with sound.

Reduces power consumption of the System by spinning down Physical Devices that are not in use.

Indicates the function of restoring the degraded battery due to charging and discharging.

Basic Terms on Universal RAID Utility

Standard Mode

Term

Advanced Mode

Easy Configuration

RAID Log

OS Log

Alert rescan

Description

Default running mode of Universal RAID Utility.

In the mode, you can use the standard functions for managing the RAID System.

Maintenance/high-performance mode of Universal RAID Utility.

To use this mode, expert knowledge on RAID is required. You can mainly use the functions required for maintenance jobs, functions of setting data about a RAID System closely to configure the system and functions of changing parameters.

The function is provided by the Universal RAID Utility to configure a RAID System easily.

Allows an optimum RAID System to be configured only by deciding the number of

Physical Devices used by a Logical Drive and the number of Logical Drives for each RAID

Controller.

Means the log for the Universal RAID Utility.

Means the log provided by OS.

OS Log is the event log (system) in Windows or the syslog in Linux.

Means the operation of sending events such as failures occurred in a RAID System to external systems.

Means the operation of acquiring all the information on managed RAID Systems to update the information managed by the Universal RAID Utility to the latest.

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