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22 About PERC 6 and CERC 6i Controllers
Cache
Memory
256-MB
DDRII cache
memory size
Optional 512-
MB DIMM
256-MB DDRII
cache memory
size
256-MB DDRII
cache memory
size
128-MB
DDRII
cache
memory
size
Cache
Function
Write-Back,
Write-Throug
h, Adaptive
Read Ahead,
No-Read
Ahead,
Read Ahead
Write-Back,
Write-Through,
Adaptive
Read Ahead,
No-Read Ahead,
Read Ahead
Write-Back,
Write-Through,
Adaptive
Read Ahead,
No-Read Ahead,
Read Ahead
Write-Back,
Write-
Through,
Adaptive
Read
Ahead,
No-Read
Ahead,
Read Ahead
Maximum
Number of
Spans per
Disk Group
Up to 8 arrays Up to 8 arrays Up to 8 arrays N/A
Maximum
Number of
Virtual Disks
per Disk
Group
Up to 16
virtual disks
per disk group
for non-
spanned RAID
levels: 0, 1, 5,
and 6.
One virtual
disk per disk
group for
spanned RAID
levels: 10, 50,
and 60.
Up to 16 virtual
disks per disk
group for non-
spanned RAID
levels: 0, 1, 5,
and 6.
One virtual disk
per disk group
for spanned
RAID levels: 10,
50, and 60.
Up to 16 virtual
disks per disk
group for non-
spanned RAID
levels: 0, 1, 5,
and 6.
One virtual disk
per disk group
for spanned
RAID levels: 10,
50, and 60.
Up to 16
virtual disks
per disk
group
RAID 0=16
RAID 1=16
Multiple
Virtual Disks
per
Controller
Up to 64
virtual disks
per controller
Up to 64 virtual
disks per
controller
Up to 64 virtual
disks per
controller
Up to 64
virtual disks
per
controller
Table 3-1. PERC 6 and CERC 6/i Controller Comparisons (continued)
Specification PERC 6/E
Adapter
PERC 6/i Adapter PERC 6/i
Integrated
CERC 6/i
Integrated
Dell_PERC6.1_UG.book Page 22 Wednesday, April 15, 2009 4:18 PM