Dell 6 series User Manual page 34

RAID level. When a RLM/OCE operation is complete, a reboot is not
necessary. For a list of RAID level migrations and capacity expansion
possibilities, see Table 3-2.
The source RAID level column indicates the virtual disk level before the
RAID level migration and the target RAID level column indicates the RAID
level after the operation is complete.
NOTE:
If you configure 64 virtual disks on a controller, you cannot perform a
RAID level migration or capacity expansion on any of the virtual disks.
NOTE:
The controller changes the write cache policy of all virtual disks undergoing
a RLM/OCE to Write-Through until the RLM/OCE is complete.
Table 3-2. RAID Level Migration
Source Target
RAID RAID
Level Level
RAID 0 RAID 1 1
RAID 0 RAID 5 1 or more
RAID 0 RAID 6 1 or more
RAID 1 RAID 0 2
RAID 1 RAID 5 2
RAID 1 RAID 6 2
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About PERC 6 and CERC 6/i Controllers
Required Number of
Number of Physical
Physical Disks
Disks (End)
(Beginning)
2
3 or more Yes
4 or more Yes
1 or more Yes
3 or more Yes
4 or more Yes
Capacity Description
Expansion
Possible
No Converting non-redundant
virtual disk into a mirrored
virtual disk by adding one drive.
At least one drive needs to be
added for distributed parity
data.
At least two drives need to be
added for dual distributed
parity data.
Removes redundancy while
increasing capacity.
Maintains redundancy while
doubling capacity.
Two drives are required to be
added for distributed parity
data.