Thecus N8900 series User Manual page 115

Expand Volume
The iSCSI volume is now able to expand its capacity from unused space (Instant
Allocation mode only). From the volume list, simply select the iSCSI volume you
like to expand and click the Expand button:
You will then see the dialog box displayed below. Drag the Expand Capacity bar to
the size you want. Then press Expand to confirm the operation.
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