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Introduction to RAID 35

Disk Spanning

Disk spanning allows multiple physical drives to function like one big drive.

Spanning overcomes lack of disk space and simplifies storage management

by combining existing resources or adding relatively inexpensive resources.

For example, four 20 GB drives can be combined to appear to the operating

system as a single 80 GB drive.

Spanning alone does not provide reliability or performance enhancements.

Spanned logical drives must have the same stripe size and must be

contiguous. In the following graphic, RAID 1 array is turned into a RAID 10

array.

Figure 2-3. Example of Disk Spanning

60 GByte 60 GByte

Can Be Accessed as

One 120 GByte Drive

60 GByte 60 GByte

Can Be Accessed as

One 120 GByte Drive

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Dell DCL and 3 Guide de l'utilisateur Page 37