Chapter 8. Configuring Units
154 3ware Serial ATA RAID Controller User Guide
To change the RAID level of a unit
1 In 3DM 2, choose
Management > Maintenance.
2 In the Unit Maintenance table on the Maintenance Page, select the unit for
which you wish to change the RAID level, by checking the box next to
the Unit ID.
3 Click the
Migrate Unit button.
The Migrate dialog box appears.
4 Select any drives to be added to the unit.
5 Select the new RAID level.
6 Optionally, select a new Stripe size.
7Click
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.
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.
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.)
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 Maintenace Page, select the unit you
wish to expand by checking the box next to the Unit ID.
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