Avago Technologies 3ware SAS 9750-16i4e - Manual (Page 97)

Unit Object Commands
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on your operating system, you might need to first unmount the unit, then use
CLI commands to remove and rescan the unit so that the operating system can
determine the new capacity, and then remount the unit. For details see “/cx/ux
remove [noscan] [quiet]” on page 78 and “/cx rescan [noscan]” on page 57.
If necessary, you can resize the file system or add a new partition. For
instructions, consult the documentation for your operating system.
Example of splitting a mirror
//localhost> /c1/u3 migrate type=single
Sending migration message to /c1/u3 ... Done.
In this case, the command requests that u3 be split into Single units. In this
case, u3 is a RAID 1 and the Migrate command splits u3 into u3 and ux, each
with a RAID type of Single.
Example of capacity expansion
//localhost> /c0/u3 migrate type=raid10 disk=10-11 stripe=16
Sending migration message to /c0/u3 ... Done.
In this case, the command indicates that the source unit is u3, and the
destination unit has a RAID type of raid10 and has added the disks 10 and 11
to the disks in the existing unit u3.
Example of migrate output
The following is an example of how the CLI shows migrating units. In this
example, the report indicates that
/c0/u3 is a migrating unit with 39 percent
completion. The report also indicates that Source Unit su0 is type RAID 1 and
Destination Unit du0 is type RAID 10.
Warning: It is important to allow migration to complete before adding drives to the
unit. Making physical changes to the unit during migration can cause the migration
process to stop, and can jeopardize the safety of your data.
Warning: Make sure that no I/O is pending and that the unit is unmounted before
you split a mirror. If the RAID 1 is the boot device, you should boot from a different
device before splitting the mirror.