Dell 6 series User Manual page 22

Table 3-1. PERC 6 and CERC 6/i Controller Comparisons (continued)
Specification
Battery
Backup Unit
Cache
Memory
Cache
Function
Maximum
Number of
Spans per
Disk Group
Maximum
Number of
Virtual Disks
per Disk
Group
22
About PERC 6 and CERC 6/i Controllers
PERC 6/E PERC 6/i Adapter
Adapter
Yes, Yes
Transportable
256-MB 256-MB DDRII
DDRII cache cache memory
memory size. size
Optional
512-MB
DIMM
Write-Back, Write-Back,
Write-Through, Write-Through,
Adaptive Adaptive
Read Ahead, Read Ahead,
No-Read No-Read Ahead,
Ahead, Read Ahead
Read Ahead
Up to 8 arrays Up to 8 arrays
Up to 16 Up to 16 virtual
virtual disks disks per disk
per disk group group for non-
for non- spanned RAID
spanned RAID levels: 0, 1, 5,
levels: 0, 1, 5, and 6.
and 6.
One virtual disk
One virtual per disk group
disk per disk for spanned
group for RAID levels: 10,
spanned RAID 50, and 60.
levels: 10, 50,
and 60.
PERC 6/i
Integrated
b
Yes
256-MB DDRII
cache memory
size
Write-Back,
Write-Through,
Adaptive
Read Ahead,
No-Read Ahead,
Read Ahead
Up to 8 arrays
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.
CERC 6/i
Integrated
No
128-MB
DDRII
cache
memory
size
Write-Back,
Write-
Through,
Adaptive
Read
Ahead,
No-Read
Ahead,
Read Ahead
Up to 2
arrays
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
level 10.