Chapter 2. Primary CLI Syntax Reference
64
3ware 9000 Series Serial ATA Controller CLI Guide
/cx/ux migrate type=
RaidType
[disk=
p:-p
]
[group=3|4|5|6] [stripe=
Stripe
] [noscan] [nocache]
[autoverify]
This feature only applies to 9000 series controllers.
This command allows you to change the existing configuration of a unit with
type=RaidType
. You can make three types of changes:
Increase the capacity
Change the RAID level (with the same or increased capacity)
Change the stripe size
The unit that results from the migration is subject to the same rules and
policies that apply when creating a new unit with the
/cx add
command. For
example, a valid number of disks and parameters must be specified.
The destination unit must use all source disks and potentially augment the
number of disks in the
disk=p:-p
disk list. Unspecified parameters are
assigned the default values (stripe size of 64K, write cache enabled,
autoverify disabled, and ignoreECC disabled). Both source name and serial
number will be carried over to the destination unit.
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.
Warning:
Do not split a RAID 1 unit if you are booted from the
drives or if the unit is mounted. Once the unit is split, any pending
writes cannot be written to the second drive. In addition, the file
system on the drive will not be clean.
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.
