3DM 2 Online Help

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.

7 | If you booted from the unit that is being migrated, when migration is complete, reboot your system. Then turn to Step 4 under Informing the Operating System of Changed Configuration.

8 | Inform the operating system of the change, as described under Informing the Operating System of Changed Configuration.

Related Topics
  RAID Level Migration (RLM) Overview
  Changing An Existing Configuration by Migrating
  Changing RAID Level
  RAID Level Migration (RLM) Overview
  Informing the Operating System of Changed Configuration

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