APC iSCSI SATA II - Manual (Page 75)

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4.3 VD Extension
To extend VD size, please follow the procedures.
1. Select “/ Volume configuration / Virtual disk”.
2. Move the mouse pointer to the gray button next to the VD number; click
“Extend”.
3. Change the size. The size must be larger than the original, and then click
“ “ to start extension.
4. Extension starts. If VD needs initialization, it will display “Initiating” in
“Status” and the completed percentage of initialization in “R%”.
NOTE: The size of to-be-extended VD must be larger than the
original.
WARNING! VD Extension cannot be executed during rebuild or
migration.