Users Guide
Supported RAID Levels
Table A-25. RAID Levels Supported by the PERC 5/E, PERC 5/i, PERC 6/E, PERC 6/I, and CERC 6/I Controllers
Read, Write, Cache and Disk Cache Policy
Table A-26. Read, Write, and Cache Policy Supported by the PERC 5/E, PERC 5/i, PERC 6/E, PERC 6/I, and CERC 6/I Controllers
Maximum Number of Spans per Virtual Disk
8
8
8
8
8
Maximum Number of Physical Disks per Span
32
32
32
32
32
Minimum Stripe Size
8k
8k
8k
8k
8k
Maximum Stripe Size
128k
128k
1MB
1MB
1MB
Maximum Number of Virtual Disks per Physical Disk
16
64
16
16
16
Maximum Number of Physical Disks that Can Be
Concatenated
Not
Applicable
256
Not Applicable
Not
Applicable
Not
Applicable
Maximum Number of Physical Disks in a RAID 0
32
100MB
32
32
32
Maximum Physical Disks in a RAID 1
2
None
2
2
2
Maximum Number of Physical Disks in a RAID 5
32
8
32
32
32
Maximum Number of Physical Disks in a RAID 10
16
16
256
For SAS controllers with firmware
version 6.1
16
16
Maximum Number of Physical Disks in a RAID 50
256
No
256
256
256
Minimum Number of Physical Disks that Can Be
Concatenated
Not
Applicable
128k
Not Applicable
Not
Applicable
Not
Applicable
Minimum Number of Physical Disks in a RAID 0
1
64
1
1
1
Minimum Number of Physical Disks in a RAID 1
2
2
2
2
2
Minimum Number of Physical Disks in a RAID 5
3
3
3
3
3
Minimum Number of Physical Disks in a RAID 10
4
4
4
4
4
Minimum Number of Physical Disks in a RAID 50
6
6
6
6
6
Maximum number of physical disks in a RAID 6
Not
Applicable
Not
Applicable
32
32
32
Maximum number of physical disks in a RAID 60
Not
Applicable
Not
Applicable
256
256
256
Minimum number of physical disks in a RAID 6
Not
Applicable
Not
Applicable
4
4
4
Minimum number of physical disks in a RAID 60
Not
Applicable
Not
Applicable
8
8
8
RAID Level
PERC 5/E
PERC 5/I
PERC 6/E
PERC 6/I
CERC 6/I
Concatenation
No
No
No
No
No
RAID 0
Yes
Yes
Yes
Yes
Yes
RAID 1
Yes
Yes
Yes
Yes
Yes
RAID 5
Yes
Yes
Yes
Yes
Yes
RAID 10
Yes
Yes
Yes
Yes
Yes
RAID 50
Yes
Yes
Yes
Yes
Yes
RAID 6
No
No
Yes
Yes
Yes
RAID 60
No
No
Yes
Yes
Yes
Read, Write, and Cache Policy
PERC 5/E
PERC 5/I
PERC 6/E
PERC 6/I
CERC 6/I
Cache settings
Yes
Yes
Yes
Yes
Yes
Read Policy
Yes
Yes
Yes
Yes
Yes
Read Ahead (Enabled)
Yes
Yes
Yes
Yes
Yes
Adaptive Read Ahead
Yes
Yes
Yes
Yes
Yes
No Read Ahead (Disabled)
Yes
Yes
Yes
Yes
Yes
Write Policy
Yes
Yes
Yes
Yes
Yes
Write Back (Enabled)
Yes
Yes
Yes
Yes
Yes
Write Through (Disabled)
Yes
Yes
Yes
Yes
Yes
Force Write Back (Enabled Always)
Yes
Yes
Yes
Yes
Yes
Write Cache Enabled Protected
No
No
No
No
No