Compaq StorageWorks 4000 - RAID Array Guida Utente Scaricare il pdf (Pagina 149)

Compaq StorageWorks RAID Array 4000 User Guide

67% to 93% 67% to 93% 50% 100%

(n-1)/n (n-1)/n n/2 n

Parity

distributed

over each

drive

Dedicated

parity drive

Duplicate

data

None

3321

Tolerant of

single drive

failures.

Higher

performance

than RAID 4.

Uses the

least

amount of

storage

capacity for

fault

tolerance.

Tolerant of

single drive

failures.

Like RAID 5,

uses the

least

amount of

storage

capacity for

fault

tolerance.

Tolerant of

multiple,

simultaneous

drive failures.

Higher

performance

than RAID 4 or

5. Uses the

most storage

capacity for

fault tolerance.

Requires an

even number

of drives.

Best

performance

but data is

lost if any

drive in the

logical drive

fails. Uses

no storage

space for

fault

tolerance.

* All drives are the same capacity

If you require a fault-tolerant system for critical data, Compaq recommends

using RAID 5 for maximum storage space efficiency, or RAID 1 if I/O

performance is more important.

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