AMCC 3WARE 720-0138-00 - Manual (Page 59)

Changing An Existing Configuration
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Figure 22. RAID Level Migration Example
Typically, a unit is reconfigured with the same or more storage capacity.
Sometimes additional drives are added. The following table shows valid
reconfigurations, some of which will require the addition of more drives.
Table 7: Valid Migration Paths
Destination
Source R0 R1 R5 R10 Single Spare
R0 Yes No Yes Yes No No
R1 Yes No Yes Yes Yes No
R5 Yes No Yes Yes No No
R10
Yes No Yes
Yes a
a. When migrating a RAID 10 to a RAID 10, the only change you can
make is the stripe size.
No No
Single Yes Yes Yes Yes No No
Spare No No No No No No