SME Server talk:Documentation:Administration Manual:Chapter4

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4.3. Hard Drive Configuration

SME Server 7 introduces a new feature - Automatic configuration of Software RAID 1, 5 or 6. RAID is a way of storing data on more than one hard drive at once, so that if one drive fails, the system will still function. In the case of RAID 6, two drives can fail and the system will still function. We highly recommend that at a minimum you utilize 2 identical drives in your sytem to take advantage of the redundancy provided by the RAID configuration.

Your server will be automatically configured as follows:

• 1 Drive - Software RAID 1 (ready to accept a second drive).
• 2 Drives - Software RAID 1
• 3 Drives - Software RAID 1 + 1 Hot-spare
• 4-6 Drives - Software RAID 5 + 1 Hot-spare
• 7+ Drives - Software RAID 6 + 1 Hot-spare

	Note:
	With SME 7.0 if you utilize more than one drive, they should all be identical in size and model. From SME 7.1 this is no longer a requirement.