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G-8 RAID EzAssist User’s Manual

problem has been resolved, no error is reported to the system. When a disk

reports a media error during a write, the controller issues a “reassign”

command to the disk, and writes the data out to a new location on the disk.

Disk System

A storage system capable of supporting only disks.

Drive Groups (or Drive Packs)

A group of individual disk drives (preferably identical) that are logically tied

to each other and are addressed as a single unit. In some cases this may be

called a drive “pack” when referring to just the physical devices. Up to eight

(8) drives can be configured together as one drive group.

All the physical devices in a drive group should have the same size,

otherwise each of the disks in the group will effectively have the capacity of

the smallest member. The total size of the drive group will be the size of the

smallest disk in the group multiplied by the number of disks in the group.

For example, if you have 4 disks of 400MB each, and 1 disk of 200MB in a

pack, the effective capacity available for use is only 1000MB (5x200), not

1800MB.

Drive Traveling

In the process of replacing a failed disk, disk traveling occurs when the

drives are placed in a different order than the original one. Drive traveling is

also known as disk roaming.

Drivers

A software routine which receives I/O requests from higher levels within the

operating system and converts those request to the protocol required by a

specific hardware device.

ECC

Error Correcting Code. A method of generating redundant information

which can be used to detect and correct errors in stored or transmitted data.

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Mylex AcceleRAID 250 Informations techniques Page 224