3Ware 720-0127-02 Manual page 71

A special case of this command is when the source unit has a type of RAID1
and destination unit has a type of single. In this case, the migrate command
splits both drives into two identical single disks. The disk name will be
duplicated on the destination units, but the source unit serial number will not
be carried over to the new unit. The new destination unit will have its own
serial number.
type=RaidType specifies the RAID type of the destination unit. Possible unit
types include raid0, raid1, raid5, raid10, raid50, or single.
For example, type=raid5 indicates the destination unit is RAID-5. The
type=single is a special case of the migrate command. It splits the source unit
RAID-1 or TWINSTOR into multiple Single units.
Note: You can only migrate a unit to a RAID level that has the same or more
capacity as the existing one. A four-drive RAID 5 unit can migrate to a four-
drive RAID 0, but a four-drive RAID 0 unit cannot migrate to a four-drive
RAID 5, without adding another drive, due to the need for additional storage
capacity for parity bits.
The following table illustrates valid migration paths:
Table 11: Valid Migration Paths
Source
R0
R1
R5
R10
R50
Single
JBOD
Spare
disk=p:-p.. consists of a list of ports (disks) to be used in addition to the
source disks in the construction of the destination unit. One or more ports can
be specified. Multiple ports can be specified using a colon (:) or a dash (-) as
port index separators. A dash indicates a range and can be mixed with colons.
For example disk=0:1:2-5:9:12 indicates port 0, 1, 2 through 5 (inclusive), 9
and 12.
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R0 R1 R5 R10
Yes No Yes Yes
Yes No Yes Yes
Yes No Yes Yes
Yes No Yes Yes
Yes No Yes Yes
Yes Yes Yes Yes
No No No No
No No No No
Unit Object Commands
Destination
R50 Single JBOD
Yes No No
Yes Yes No
Yes No No
Yes No No
Yes No No
Yes No No
No No No
No No No
Spare
No
No
No
No
No
No
No
No
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