Dell 3 - Manual (Page 97)

Configuring PERC 3 95
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.
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.
5 100% protection through striping and parity. The data is striped and
parity data is written across a number of physical disk drives.
Ta b l e 7 - 9 . P e r f o r m a n c e C h a r a c t e r i s t i c s f o r E a c h R A I D
L e v e l
RAID
Level
Performance Characteristics
0 Excellent for all types of input/output (I/O) activity, but provides no
data security.
1 Provides data redundancy and good performance.
5 Provides 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.
Ta b l e 7 - 1 0 . P h y s i c a l D r i v e s R e q u i r e d f o r E a c h R A I D L e v e l
RAID
Level
Minimum Number of
Physical Drives
Maximum Number of Physical
Drives
0 1 32
1 2 2
Ta b l e 7 - 8 . Fa u l t To l e r a n c e Fe a t u r e s f o r R A I D L e v e l s 0 , 1
a n d 5
(continued)
RAID
Level Fault Tolerance Protection