User's Manual


Supported RAID Levels
Table A-7. RAID Levels Supported by the PERC 3/SC, 3/DC, 3/QC, 4/SC, 4/DC, 4/Di, 4e/Si, 4e/Di, 4e/DC, CERC ATA100/4ch, and 4/IM
Controllers

Read, Write, and Disk Cache Policy
Table A-8. Read, Write and Disk Cache Policy Supported by the PERC 3/SC, 3/DC, 3/QC, 4/SC, 4/DC, 4/Di, 4e/Si, 4e/Di, 4e/DC, CERC
ATA100/4ch,and4/IMControllers

in a RAID 50
Minimum Number of Physical Disks
that Can Be Concatenated
2
2
2
2
2
2
2
2
2
2
NA
Minimum Number of Physical Disks in
a RAID 0
1
1
1
1
1
1
1
1
1
1
NA
Minimum Number of Physical Disks in
a RAID 1
2
2
2
2
2
2
2
2
2
2
2
Minimum Number of Physical Disks in
a RAID 5
3
3
3
3
3
3
3
3
3
3
NA
Minimum Number of Physical Disks in
a RAID 10
4
4
4
4
4
4
4
4
4
4
NA
Minimum Number of Physical Disks in
a RAID 50
6
6
6
6
6
6
6
6
6
NA
NA
Maximum number of physical disks in
a RAID 6
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
Maximum number of physical disks in
a RAID 60
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
Minimum number of physical disks in
a RAID 6
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
Minimum number of physical disks in
a RAID 60
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA

RAID Level

PERC
3/SC

PERC
3/DC

PERC
3/QC

PERC
4/SC

PERC
4/DC

PERC
4/DI

PERC
4e/SI

PERC
4e/DI

PERC
4e/DC

CERC ATA
100/4ch

PERC
4/IM
Concatenation
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
RAID 0
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
RAID 1
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
RAID 5
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
RAID 10
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
RAID 50
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
RAID 6
No
No
No
No
No
No
No
No
No
No
No
RAID 60
No
No
No
No
No
No
No
No
No
No
No

Read, Write, and Disk
Cache Policy

PERC
3/SC

PERC
3/DC

PERC
3/QC

PERC
4/SC

PERC
4/DC

PERC
4/DI

PERC
4e/SI

PERC
4e/DI

PERC
4e/DC

CERC ATA
100/4ch

PERC
4/IM
Cache settings
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Read Policy
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Read Ahead (Enabled)
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Adaptive Read Ahead
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No Read Ahead (Disabled)
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Write Policy
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Write Back (Enabled)
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Write Through (Disabled)
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Force Write Back (Enabled
Always)
No
No
No
No
No
No
No
No
No
No
No
Write Cache Enabled
Protected
No
No
No
No
No
No
No
No
No
No
No
Disk Cache Policy
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Cache I/O
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Direct I/O
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No