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Unit Object Commands
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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:
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.
Table 11: Valid Migration Paths
Destination
Source
R0
R1
R5 R10
R50
Single
JBOD
Spare
R0
Yes
No
Yes
Yes
Yes
No
No
No
R1
Yes
No
Yes
Yes
Yes
Yes
No
No
R5
Yes
No
Yes
Yes
Yes
No
No
No
R10
Yes
No
Yes
Yes
Yes
No
No
No
R50
Yes
No
Yes
Yes
Yes
No
No
No
Single
Yes
Yes
Yes
Yes
Yes
No
No
No
JBOD
No
No
No
No
No
No
No
No
Spare
No
No
No
No
No
No
No
No