Hp Array Controller HSG V8.7 Software Bedienungsanleitung Seite 93

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Seitenansicht 92
Creating Storagesets 315
Using RAIDsets to Increase Performance and Availability
RAIDsets are enhanced stripesetsthey use striping to increase I/O
performance and distributed-parity data to ensure data availability.
Figure 37 illustrates the concept of RAIDsets and parity data.
Figure 37 Parity Ensures Availability; Striping Provides Good
Performance
Just as with stripesets, the I/O requests are broken into smaller
chunks and striped across the disk drives until the request is read or
written. But, in addition to the I/O data, chunks of parity dataderived
mathematically from the I/O dataare also striped across the disk
drives. This parity data enables the controller to reconstruct the I/O data
if a disk drive fails. Thus, it becomes possible to lose a disk drive
without losing access to the data it contained. (Data could be lost if a
second disk drive fails before the controller replaces the first failed disk
drive.)
For example, in a three-member RAIDset that contains disk drives
10000, 20000, and 30000, the first chunk of an I/O request is written to
10000, the second to 20000, then parity is calculated and written to
30000; the third chunk is written to 30000, the fourth to 10000, and so
on until all of the data is saved.
CXO5509A
I/O Request
Chunk 1
2
4
3
D
i
s
k
1
0
0
0
0
Chunk 1
4
D
i
s
k
2
0
0
0
0
2
Parity
for
3 & 4
D
i
s
k
3
0
0
0
0
Parity
for
1 & 2
3
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