Avago Technologies 3ware SAS 9750-16i4e - Manual (Page 95)

Unit Object Commands
www.lsi.com/channel/products 87
The following table illustrates valid migration paths:
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. You can specify
one or more ports. You can specify Multiple ports by 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. (You can only use this attribute when type=raid50.)
Note that a RAID 50 is a multitier 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 16. For
example group=3 indicates 3 disks of RAID 5 at the bottom layer of RAID
50.
Note: You can only migrate a unit to a RAID level that has the same or more
capacity as the existing one. You can migrate a four-drive RAID 5 unit to a four-drive
RAID 0, but you cannot migrate a four-drive RAID 0 unit to a four-drive RAID 5
unless you add another drive, due to the need for additional storage capacity for
parity bits.
Table 9: Valid Migration Paths
Source Destination
R0 R1 R5 R6 R10 R50 Single
R0 Yes No Yes Yes Yes Yes No
R1 Yes No Yes Yes Yes Yes Yes
R5
Yes No Yes Yes Yes Yes No
R6 Yes No Yes Yes Yes Yes No
R10 Yes No Yes Yes Yes Yes No
R50 Yes No Yes Yes Yes Yes No
Single Yes Yes Yes Yes Yes Yes No
Spare No No No No No No No