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Unit Object Commands
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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.
group=3|4|5|6|7|8 indicates the number of disks per group for a RAID 50
type. (This attribute can only be used when type=raid50.) Recall that a RAID
50 is a multi-tier array. At the bottom-most layer, N number of disks per group
are used to form the RAID 5 layer. These RAID 5 arrays are then integrated
into a RAID 0. This attribute allows you to specify the number of disks in the
RAID 5 level. Valid values are 3, 4, 5, 6, 7, and 8. For example group=3
indicates 3 disks of RAID 5 at the bottom layer of RAID 50.
Note that a sufficient number of disks are required for a given pattern or disk
group. For example, given 6 disks, specifying 3 will create two RAID 5
arrays. With 12 disks, specifying 3 will create four RAID 5 arrays under the
RAID 0 level. With only 6 disks a grouping of 6 is not allowed, as you would
basically be creating a RAID 5.
The default RAID 50 grouping varies, based on number of disks. For 6 and 9
disks, default grouping is 3. For 8 disks, the default grouping is 4. For 10
disks, the default grouping is 5, and for 12 disks, the disks can be grouped into
groups of 3, 4, or 6 drives (the group of 4 drives is set by default as it provides
Table 11: Valid Migration Paths
Destination
Source R0 R1 R5 R6 R10 R50 Single JBOD Spare
R0
Yes No Yes Yes Yes Yes No No No
R1
Yes No Yes Yes Yes Yes Yes No No
R5
Yes No Yes Yes Yes Yes No No No
R6
Yes No Yes Yes Yes Yes No No No
R10
Yes No Yes Yes Yes Yes No No No
R50
Yes No Yes Yes Yes Yes No No No
Single
Yes Yes Yes Yes Yes Yes No No No
JBOD
No No No No No No No No No
Spare
No No No No No No No No No