Raid 0; Figure 2-5. Raid 0 Write - Compaq StorageWorks RAID Array 3000 Controller Shelf User Manual

2-10 RAID Array 3000 Controller Shelf Hardware User's Guide

RAID 0

RAID 0 breaks up data into smaller chunks and writes each chunk to a
different drive in the array. The size of each chunk is determined by the
controller's chunk size parameter, which you set in the course of creating a
RAID set.
The advantage of RAID 0 is its high bandwidth. By breaking up a large block
of data into smaller chunks, the controller can use multiple drive channels to
write the chunks to the disk drives. Furthermore, RAID 0 involves no parity
calculations to complicate the write operation. Likewise, a RAID 0 read
operation employs multiple drives to assemble a single, large data block. This
makes RAID 0 ideal for applications such as graphics, video, and imaging that
involve the writing and reading of large, sequential blocks. Figure 2– 5 shows a
diagram of a RAID 0 write.
CAUTION: The lack of parity means that a RAID 0-disk array offers no
redundancy and thus cannot recover from a drive failure.
Host Data Controller divides the
data into chunksized units
1011 0001
1011
0110 1100
0110
1010 1111
1010
0101 0111
0101
0000 1010
0000
There is still data left
so the Controller
repeats the process

Figure 2-5. RAID 0 write

Striped data
written to the array
0001
Striped data
1100
written to the array
1111
0111
1010
SHR-1054