Promise Technology FastTrak TX4000 Manuel d'utilisateur télécharger pdf (Page 80)

Promise Array Management

RAID 1

RAID 1 takes the data written on one disk

and copies it to another, making a mirror or

exact copy. This arrangement does not have

a significant performance advantage. If one

disk fails, there is no data loss. There is no

rebuild, just a copy of the data to the disk.

RAID 0+1

Disk Drives

Data

Mirror

Data Stripe

RAID 0+1 is a combination the high data rates of RAID 0 and full redundancy of

RAID 1. A disadvantage is that you must have at least 4 hard disks to implement

it. If one disk fails, there is no data loss. There is no rebuild, just a copy of the

data to the disk.

Disk Drives

Data Mirror

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Promise Technology FastTrak TX4000 Manuel d'utilisateur Page 80