Avago Technologies 3ware 9650SE-12ML (Channel) - Manual (Page 247)

Maintenance page
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rebuilding.) If rebuild scheduling is not enabled, the rebuild process will
begin right away.
For more information about rebuilds, see “To verify a unit through 3BM” on
page 166.
Migrate Unit. Reconfigures a unit while it is on-line. Migration can be used to
change the RAID level, to expand the capacity by adding additional drives, or
to change the stripe size.
When you select a unit and click Migrate Unit , a dialog box appears which
lists the drives in the unit and any additional available drives. In the dialog
box are two drop-down menus, one for choosing the RAID level and one for
choosing stripe size.
Figure 106. Migrating a unit
You can only migrate a unit to a RAID level that will be larger than the
original unit. For example, you can migrate from a RAID 5 array with 4
drives to a RAID 0 with four drives but you cannot migrate from a RAID 5
with four drives to a RAID 10 with four drives.
After you have specified changes to the unit, the Unit Maintenance screen
reflects your changes and shows the percentage of migration completed.
While the unit is migrating, you can still access the unit as normal but the
performance will be lower. You can adjust the I/O rate with the radio buttons
on the Controller Settings page. (See “Setting Background Task Rate” on
page 172.)
Remove Unit. Removes a selected unit and allows you to unplug the drives
and move the unit to another controller. The data on the unit remain intact.
Warning: Once migration of a unit is started, it cannot be cancelled.