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Table 13: Valid Migration Paths
Source
R0
R1
Yes
Yes
Single
No
No
JBOD
No
No
Spare
disk=p:-p.. consists of a list of ports or VPorts (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 or VPort 0, 1, 2 through
5 (inclusive), 9 and 12.
group=3|4|5|6|7|8|9|10|11|12|13|14|15|16 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 through
12. For example group=3 indicates 3 disks of RAID 5 at the bottom layer of
RAID 50.
You can have a maximum of 4 subunits in a RAID 50 unit
Note:
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
the best of net capacity and performance). For 15 disks, the disks can be
grouped into groups of 5 drives (3 drive groups would make 5 subunits, you
can have a maximum of 4 subunits). For 16 disks, the disks can be grouped
into groups of 4 or 8 drives.
Note that RAID-10 always has group=2, so an attribute specifying it's group
is not necessary.
stripe=Stripe consists of the stripe size to be used. The following table
illustrates the supported and applicable stripes on the respective unit types and
controller models. Stripe size units are in KB (kilobytes).
Destination
R5
R6
R10
R50
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
Unit Object Commands
Single
Spare
JBOD
No
No
No
No
No
No
No
No
No
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