Compaq ProLiant 1000 User Guide: Online Storage Controller Recovery Option - Page 22

Configuration Options

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2-4 Functionality and Configuration Options Configuration Options This section outlines the configuration guidelines involved in establishing highly reliable I/O using OSCRO. Table 2-1 lists the RAID options available and details the requirements and benefits of each option. Raid Level 0 0 1 1 5 5 Table 2-1 Configuration Options Controller Controllers Pairing Required No 1 Min. # of Drives 1 Storage Space Overhead for Redundancy 0% Recommended Comments No Data unavailable if drive or controller fails. Yes 2 1 0% No Data unavailable if drive fails. No 1 2 50% No Data unavailable if controller fails. Yes 2 2 50% Yes Complete redundancy, high overhead. No 1 3 33% to 7% No Data unavailable if controller fails. Yes 2 3 33% to 7% Yes Complete redundancy, lowest overhead.

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2-4
Functionality and Configuration Options
Configuration Options
This section outlines the configuration guidelines involved in establishing
highly reliable I/O using OSCRO. Table 2-1 lists the RAID options available
and details the requirements and benefits of each option.
Table 2-1
Configuration Options
Raid
Level
Controller
Pairing
Controllers
Required
Min. # of
Drives
Storage Space
Overhead for
Redundancy
Recommended
Comments
0
No
1
1
0%
No
Data unavailable
if drive or
controller fails.
0
Yes
2
1
0%
No
Data unavailable if
drive fails.
1
No
1
2
50%
No
Data unavailable if
controller fails.
1
Yes
2
2
50%
Yes
Complete
redundancy, high
overhead.
5
No
1
3
33% to 7%
No
Data unavailable if
controller fails.
5
Yes
2
3
33% to 7%
Yes
Complete
redundancy,
lowest overhead.