# Example: Express configuration

If your server contains the following:

- One 1024 MB ready drive,
- Two 2150 MB ready drives,
- And four 4300 MB ready drives,

Express configuration will create three arrays and one hot-spare drive as follows:

Array A: The total capacity of this array is 1024 MB (1 x 1024 MB) and it contains one, 1024 MB RAID level-0 logical drive.

Array B: The total capacity of this array is 4300 MB (2 x 2150 MB) and it contains one, 2150 MB RAID level-1 logical drive.

Array C: The total capacity of this array is 12900 MB (3 x 4300 MB) and it contains one, 8600 MB RAID level-5 logical drive.

Hot Spare: Express configuration defines one of the four 4300 MB drives as a hot-spare drive.

Notes:
  1. When there are four or more ready drives of the same capacity, Express configuration groups three of the drives into one array (as in Array C) and defines one of the drives as a hot spare.
  2. A hot-spare drive must be of equal or greater capacity than the drive that it is intended to replace. In this configuration, the 4300 MB drive can replace any failed drives in Array B or Array C. Array A is not redundant, therefore a hot-spare drive is not used.

## More information

- Choosing between Express and Custom configuration in the wizard (SCSI)
- Choosing between Express and Custom configuration in the wizard (SAS, SATA, HostRAID)
- Configuring RAID and creating arrays (action)

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