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RAIDWatch User’s Manual

2.1 Background Information

Redundant Arrays of Independent Disks (RAID) is a storage technology

used to improve the processing capability of storage systems. This

technology is designed to provide reliability (i.e., “fault tolerance”) in

disk array systems and to take advantage of the performance gains

multiple disks can offer.

RAID comes with a redundancy feature that ensures fault-tolerant,

uninterrupted disk storage operations. In the event of a disk failure, disk

access will still continue normally with the failure transparent to the host

system.

RAID has several levels and multi-level configurations including RAID

10, 30, 50 and 60. RAID levels 1, 3 and 5 are the most commonly used

levels; while the highest fault-tolerance, RAID level 6 are also available.

Appendix C, RAID Levels, gives information about these levels and the

benefits of each.

Infortrend disk array controllers support hot-swapping so that a failed

drive can be replaced while the disk array system continues to function.

Spares can also be assigned so that, as soon as a drive fails, the spare is

automatically configured into the array and reconstruction will

commence.

2.2 Definition of Terms

This section describes some of the disk array terms used in this

documentation.

♦ Physical drives. These are the actual drives installed into the

enclosure drive slots. These drives are displayed in Enclosure View

and the Front View of different configuration windows.

♦ Spare drives. These are physical drives that serve as backups.

When a drive fails, the spare automatically joins the array and data

reconstruction commences immediately. Dedicated, Enclosure-

specific, and Global Spares are shown in different colors. A

Dedicated Spare appears in the same color as other members of the

logical drive it belongs to. A Global Spare uses the default color

(black). Both Dedicated and Global Spares have an orange cross

superimposed on them.

♦ Replacement drives. These are physical drives that are manually

configured into the array to replace failed drives. In the absence of

spare drives, you will need to use replacement drives to replace

defective drives before rebuilding. If a spare drive has been used to

2-2 Background Information

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Vicon IX 2000 L Manual de usuario Pagina 36