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About PERC 6 and CERC 6i Controllers 35
NOTE: The total number of physical disks in a disk group cannot exceed 32.
NOTE: You cannot perform RAID level migration and expansion on RAID levels 10,
50, and 60.
RAID 1 RAID 5 2 3 or more Yes Removes redundancy while
doubling capacity.
RAID 1 RAID 6 2 4 or more Yes Two drives are required to be
added for distributed parity
data.
RAID 5 RAID 0 3 or more 2 or more Yes Converting to a non-redundant
virtual disk and reclaiming disk
space used for distributed
parity data.
RAID 5 RAID 6 3 or more 4 or more Yes At least one drive needs to be
added for dual distributed
parity data.
RAID 6 RAID 0 4 or more 2 or more Yes
Converting to a non-redundant
virtual disk and reclaiming disk
space used for distributed
parity data.
RAID 6 RAID 5 4 or more 3 or more Yes Removing one set of parity
data and reclaiming disk space
used for it.
Table 3-2. RAID Level Migration (continued)
Source
RAID
Level
Target
RAID
Level
Required
Number of
Physical
Disks
(Beginning)
Number of
Physical
Disks
(End)
Capacity
Expansion
Possible
Description
Dell_PERC6.1_UG.book Page 35 Wednesday, April 15, 2009 4:18 PM