Dell 3 manual Assigning RAID Levels, Maximizing Drive Performance

Ta b l e 7 - 8 . Fa ul t		Tol e r an c e Fea t u r es f o r R A I D Le ve l s 0 , 1
a n d 5 (continued)
RAID	Fault Tolerance Protection
Level

5100% protection through striping and parity. The data is striped and parity data is written across a number of physical disk drives.

Maximizing Drive Performance

You can configure an array for optimal performance; however, optimal drive configuration for one type of application will probably not be optimal for any other application. A basic guideline of the performance characteristics for RAID drive arrays at each RAID level is shown in Table 7-9.

Ta b l e	7 - 9 . Pe r f or m an c e C h ar ac t e r i s t i c s f or E a ch R A I D
Lev e l

RAID	Performance Characteristics
Level

0Excellent for all types of input/output (I/O) activity, but provides no data security.

1Provides data redundancy and good performance.

5Provides data redundancy and good performance in most environments.

10	Provides high data transfers and complete data redundancy.
50	Provides high data transfers and data redundancy.

Assigning RAID Levels

Only one RAID level can be assigned to each logical drive. The drives required per RAID level shown in Table 7-10.

Ta b l e 7 - 1 0 . P hy s i c a l D r i ve s Req u i r ed f or E a ch R A I D Le v el

RAID	Minimum Number of	Maximum Number of Physical
Level	Physical Drives	Drives
0	1	32
1	2	2

Configuring PERC 3

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