Avago Technologies 3ware 9650SE-12ML (Channel) - Manual (Page 143)

Changing An Existing Configuration by Migrating
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4 Select any drives to be added to the unit.
5 Select the new RAID level.
6 Optionally, select a new Stripe size.
7 Click OK .
The Maintenance page updates to show the new unit and the Migration
progress.
8 Inform the operating system of the change, as described below under
“Informing the Operating System of Changed Configuration”.
Expanding Unit Capacity
You can expand a unit's capacity by adding one or more drives to it without
changing the RAID level, except for singles and RAID 1 units. (Since a single
can only have one drive, and a RAID 1 can only have two drives, if you add a
drive to either, the RAID level must be changed.)
For example, for a RAID 5 with 3 drives, you can change the capacity by
adding a forth drive.
Expanding unit capacity can be accomplished while the unit is online, without
experiencing any data loss. This process is also referred to as Online Capacity
Expansion (OCE).
To expand a unit’s capacity
1 In 3DM 2, choose Management > Maintenance.
2 In the Unit Maintenance table on the Maintenance Page, select the unit
you wish to expand by checking the box next to the Unit ID.
3 Click the Migrate Unit button.
The Migrate dialog box appears, listing the drives which can be added to
the unit.
4 Select the drives(s) you wish to add to the unit by checking the Port ID
box next to each one.
5 If desired or necessary, select the appropriate RAID level.
6 Click OK .
The Maintenance page updates to show the newly reconfigured unit. The
Status column title indicates that Migration is in progress.