Dell PowerEdge RAID Controller 6E - Manual (Page 34)

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About PERC 6 and CERC 6/i Controllers
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
RAID
Level Target
RAID
Level Required
Number of
Physical
Disks
(Beginning) Number of
Physical
Disks
(End) Capacity
Expansion
Possible Description
RAID 0 RAID 1 1 2 No Converting non-redundant
virtual disk into a mirrored
virtual disk by adding one drive.
RAID 0 RAID 5 1 or more 3 or more Yes At least one drive needs to be
added for distributed parity
data.
RAID 0 RAID 6 1 or more 4 or more Yes At least two drives need to be
added for dual distributed
parity data.
RAID 1 RAID 0 2 1 or more Yes Removes redundancy while
increasing capacity.
RAID 1 RAID 5 2 3 or more Yes Maintains redundancy while
doubling capacity.
RAID 1 RAID 6 2 4 or more Yes Two drives are required to be
added for distributed parity
data.
Dell_PERC6.2_UG.book Page 34 Wednesday, June 24, 2009 6:08 PM