It may be necessary to know exactly what a lun being presented from the array is called within the Filestore cluster. This can be tracked by using the Host LUN ID within the array and the Disk Serial ID within the NAS engine.
Log in to the array controller using the ISM gui and select the host group which maps the lun to the N8300 NAS engine. Note the numbers in the 'Host LUN ID' column.
Log in as the master user, either within the ISM gui or using the CLI.
With the CLI use the 'storage disk list detail' command to show information on the luns presented
n8300> storage disk list detail
Disk Pool Enclosure Size Use% ID Serial Number
==== ============================= ========== ==== ==== == ==================================
huawei-s5600-0_13 - huawei-s5600-0 20.00G 0.0% HUAWEI:S5600:0:2 60022A110001BDC12F3C4EBA00000001
huawei-s5600-0_14 - huawei-s5600-0 20.00G 0.0% HUAWEI:S5600:0:1 60022A110001BDC12F3C4C1800000000
huawei-s5600-0_15 - huawei-s5600-0 50.00G 0.0% HUAWEI:S5600:0:9 60022A110001BDC13006ABF600000002
Alternatively, using the ISM gui click on either 'Unused Disk' or 'Used Disk'