# Example: Logical drive configurations

Note: Not all RAID levels are supported by all ServeRAID controllers.

## Example 1

The array consists of three 1 GB drives. You assign RAID level-0, which uses all the physical drives in the array with no redundant or parity storage; then, you type 1000. The logical drive will actually only use 999 MB because it is the number closest to and lower than 1000 that is divisible by 3.

## Example 2

The array consists of three 1 GB drives. You assign RAID level-1E, which provides disk mirroring and stripes data across all physical drives in the array. Because the data is mirrored, the capacity of the logical drive is 50% of the physical capacity of the physical drives grouped in the array. If you type 1000, the physical capacity used is 2000 MB, twice that of the logical drive size. The number that is closest to and lower than 2000 that is divisible by 3 is 1998, which will be the actual space used. The logical drive size is 999 MB, which is 50% of the physical capacity.

## Example 3

The array consists of three 1 GB drives and you assign RAID level-5 . Data is striped across all three physical drives in the array, but the space equivalent to that of one physical drive is used for redundant storage. Therefore, if you type 1000, the number 1000 remains in the Size (MB) field because it is divisible by 2 (drives), which is the space available for data. The physical capacity used is 1500 MB.

## More information

- Understanding creating logical drives
- Selecting the logical drive size
- Selecting the RAID level by array capacity
- Creating logical drives (action)
- Configuring RAID and creating arrays (action)
- Creating logical drives in the wizard
- Example: Usable and unusable capacity

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