Logical drive examples
Example 1
The array consists of three 1 GB
drives. You assign RAID level 0 , which uses all the
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 1 , which provides disk mirroring
and stripes data across all drives in the array. Because the data is mirrored,
the capacity of the logical drive is 50% of the physical capacity of the hard
disk 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 drives in the array, but the space equivalent to that of one 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.