Thecus N8900 series User Manual page 117

Next, allocate capacity for the iSCSI thin-provision volume by dragging the
Allocation bar to the desired size.
After the size has been determined, click OK to confirm. Now you will see the iSCSI
thin-provisioning volume is available from the list. Please refer to the screenshot
below.
If creating an iSCSI target volume under "Instant Allocation", physical memory is
assign to the target, being limited by the available memory. For the iSCSI target
volume created under "thin-provisioning", virtual memory is assigned to the
volume, which can go up to 16384GB (16TB).
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