Gateway Ultra2 User Manual download pdf (Page 25)

Chapter 2 Introduction to RAID

Disk Mirroring

With mirroring (used in RAID 1), data written to one disk

drive is simultaneously written to another disk drive. If one

disk drive fails, the contents of the other disk drive can be

used to run the system and reconstruct the failed drive. The

primary advantage of disk mirroring is that it provides

100% data redundancy. Since the contents of the disk drive

are completely written to a second drive, it does not matter

if one of the drives fails. Both drives contain the same data

at all times. Either drive can act as the operational drive.

Disk mirroring provides 100% redundancy, but is

expensive because each drive in the system must be

duplicated.

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Gateway Ultra2 User Manual Page 25