HP StorageWorks HSG80 ACS Solution Software V8.8 for Sun Solaris Installation and Configuration Guide (AA-RV1RA-TE, March 2005)

Planning Storage Configurations
80 HSG80 ACS Solution Software V8.8 for Sun Solaris Installation and Configuration Guide
Mirrorset Planning Considerations
Mirrorsets (RAID 1) use redundancy to ensure availability, as illustrated in
Figure 26. For each primary disk drive, there is at least one mirror disk drive.
Thus, if a primary disk drive fails, its mirror drive immediately provides an exact
copy of the data. Figure 27 shows a second example of a Mirrorset.
Figure 26: Mirrorsets maintain two copies of the same data (example 1)
Figure 27: Mirrorset (example 2)
D
i
s
k
1
0
0
0
0
D
i
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k
2
0
1
0
0
D
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s
k
1
0
2
0
0
D
i
s
k
2
0
0
0
0
D
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1
0
1
0
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2
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2
0
0
CXO7288A
A'A
B'
B
C'C
Mirror drives contain
copy of data
Operating
system
view
Actual
device
mappings
Mirrorset
CXO4594B
Disk 1
Block 0
Block 1
Block 2
etc.
Disk 2
Block 0
Block 1
Block 2
etc.
Virtual disk
Block 0
Block 1
Block 2
etc.