Mylex eXtremeRAID Installation Guide download pdf (Page 66)

G-8 eXtremeRAID Installation Guide

Rebuild: A SCSI 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 also referred to as

‘Write-Only’ (WRO).

Segment Size

See “Cache Line Size.”

Session

Refers to the period of time between any two consecutive system shutdowns.

System shutdown may be either a power off/on, or a hardware reset.

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 SCSI disk drive fails and both of the

following conditions are true:

• A “standby” SCSI disk drive of identical 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.

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Mylex eXtremeRAID Installation Guide Page 66