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Dell OpenManage Server Administrator Storage ... - Dell Support

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4 Contents<br />

Common <strong>Storage</strong> Tasks . . . . . . . . . . . . . . . . . 33<br />

3 Understanding RAID Concepts . . . . . . . 35<br />

What Is RAID? . . . . . . . . . . . . . . . . . . . . . . 35<br />

Hardware and Software RAID . . . . . . . . . . . 35<br />

RAID Concepts . . . . . . . . . . . . . . . . . . . 36<br />

RAID Levels . . . . . . . . . . . . . . . . . . . . . 37<br />

Organizing Data <strong>Storage</strong> for Availability and<br />

Performance . . . . . . . . . . . . . . . . . . . . . . . 37<br />

Choosing RAID Levels and Concatenation . . . . . . . 38<br />

Concatenation . . . . . . . . . . . . . . . . . . . 39<br />

RAID Level 0 (Striping) . . . . . . . . . . . . . . . 40<br />

RAID Level 1 (Mirroring) . . . . . . . . . . . . . . 42<br />

RAID Level 5 (Striping with distributed parity) . . . 43<br />

RAID Level 6 (Striping with additional distributed<br />

parity) . . . . . . . . . . . . . . . . . . . . . . . . 44<br />

RAID Level 50 (Striping over RAID 5 sets) . . . . . 46<br />

RAID Level 60 (Striping over RAID 6 sets) . . . . . 48<br />

RAID Level 10 (Striping over mirror sets) . . . . . . 50<br />

RAID Level 1-Concatenated (Concatenated<br />

mirror) . . . . . . . . . . . . . . . . . . . . . . . . 52<br />

Considerations for RAID 10 and 50 on PERC 4/SC,<br />

4/DC, 4e/DC, 4/Di, 4e/Si, and 4e/Di . . . . . . . . . 53<br />

Comparing RAID Level and Concatenation<br />

Performance . . . . . . . . . . . . . . . . . . . . . . . 53<br />

No-RAID . . . . . . . . . . . . . . . . . . . . . . . . . 55

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