Mylex eXtremeRAID Installationsanleitung PDF herunterladen (Seite 205)

Glossary

Manual No. 771961 G-11

Single Controller (Simplex) Mode

A single controller attached to a set of drives that offers RAID functionality

without the controller fault tolerance inherent in dual-active mode.

Standard Disk Drive

This term refers to a hard disk drive with SCSI, IDE, or other interface, that

is attached to the host system through a standard disk controller.

Standby Replacement of Disks (“Hot Spare”)

The “Standby Replacement” (or “Hot Spare”) is one of the most important

features the controller provides to achieve automatic, non-stop service with a

high degree of fault-tolerance. The rebuild operation will be carried out by

the controller automatically when a disk drive fails and both of the following

conditions are true:

• A “standby” disk drive of identical or larger size is found attached to

the same controller;

• All of the system drives that are dependent on the failed disk are

redundant system drives, e.g., RAID 1, RAID 3, RAID 5, RAID 0+1.

☛ Note

The automatic rebuild will only happen on the SAME

controller, never across controllers.

A “Hot Spare” disk can be created in one of two ways:

1. When configuring via a Mylex configuration utility, all disks attached

to the controller that are NOT configured into any disk array will be

automatically labeled as hot spare drives.

2. A disk drive may also be added (attached at a later time) to a running

system and labeled as a hot spare.

3. The controller creates the hot spare.

During the automatic rebuild process, system activity continues as normal.

System performance may degrade slightly during the rebuild process.

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Mylex eXtremeRAID Installationsanleitung Seite 205