Dell OpenManage Server Administrator Managed Node for Fluid Cache for DAS Bedienungsanleitung PDF herunterladen (Seite 38)

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38 Understanding RAID Concepts

When a physical disk in a concatenated or spanned volume fails, the entire

volume becomes unavailable. Because the data is not redundant, it cannot be

restored by rebuilding from a mirrored disk or parity information. Restoring

from a backup is the only option.

Because concatenated volumes do not use disk space to maintain redundant

data, they are more cost-efficient than volumes that use mirrors or parity

information. A concatenated volume may be a good choice for data that is

temporary, easily reproduced, or that does not justify the cost of data

redundancy. In addition, a concatenated volume can easily be expanded by

adding an additional physical disk.

Figure 3-1. Concatenating Disks

• Concatenates

disks as one large virtual disk with a capacity of

disks.

• Data fills up the first disk before it is written to the second disk.

• No redundancy data is kept. When a disk fails, the large virtual disk fails.

• No performance gain.

• No redundancy.

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