The disk group consists of three 1 GB drives. You assign RAID level-0, which uses all the physical drives in the disk group with no redundant or parity storage; then, you type 1000. The logical device will actually only use 999 MB because it is the number closest to and lower than 1000 that is divisible by 3.
The disk group consists of three 1 GB drives and you assign RAID level-5 . Data is striped across all three physical drives in the disk group, 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.
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