Mylex eXtremeRAID Guia de Instalação descarregar pdf (Página 202)

Glossary

G-8 GAM Client v3.00 and WSAM User’s Manual

☛ Note

Ready State does not apply for Mylex External RAID

Controllers

Online: A disk drive is in an “online” state if it...

Is powered on; and

Has been defined as a member of a drive group; and

Is operating properly.

Standby: A disk drive is in a “standby” state if it...

Is powered on; and

Is able to operate properly; and

Was NOT defined as part of any drive group.

Dead: A disk drive is in a “dead” state if it...

Is not present; or

If it is present but not powered on; or

If it failed to operate properly and was ‘killed’ by the controller.

When the controller detects a failure on a disk, it “kills” that disk by

changing its state to “dead.” A drive in a dead state does not participate in

any I/O activity. No commands are issued to dead drives.

Rebuild: A disk drive is in a “rebuild” state...

While it is in the process of being rebuilt. During this process, data is

regenerated and written to the disk drive. This state is sometimes referred to

as ‘Write-Only’ (WRO).

RAID

RAID stands for Redundant Array of Independent Disks. Several different

forms of RAID implementation have been defined. Each form is usually

referred to as a “RAID level.” The basic RAID levels supported by Mylex

Disk Array Controllers are shown below.

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Mylex eXtremeRAID Guia de Instalação Página 202