topic Re: how to find LUN not used ? (is there a way to fined orphan LUN?) in Ask The Experts

how to find LUN not used ? (is there a way to fined orphan LUN?)

arieshenar — Thu, 02 Apr 2020 14:54:27 GMT

Hi,

i have Ontap 9.6 with FC.

500 hosts using HBA and 350 LANs.

i want to know what LUNs are presented to hosts that not connected to the storage.

currently i am running "fcp ping-igroup show" and using excell manipulation to get list of disconnected hosts.

is there a way to fined orphan LUN? (better by GUI)

Re: how to find LUN not used ? (is there a way to fined orphan LUN?)

Ontapforrum — Thu, 02 Apr 2020 17:38:51 GMT

Hi,

Simplest way to identify LUNs which are not connected to Storage is to search using 'unmapped' filter. This will inventory the LUN which are 'unmapped' from storage (whether offline or online state). Please note, if the volumes holding the LUNs are offline, then it cannot retrieve the LUNs except the volume names.

CLI:

::> lun show -mapped unmapped
Vserver Path State Mapped Type Size
--------- ------------------------------- ------- -------- -------- --------
test_SVM /vol/lun_iscsi_vol/lun_iscsi
online unmapped windows_2008 10.00GB

Warning: the LUN inventory was not available for the following volumes:
Volume "test" on Vserver "test_SVM". Reason: Volume is offline

I doubt GUI has that field to sort on.

Thanks!

Re: how to find LUN not used ? (is there a way to fined orphan LUN?)

arieshenar — Sun, 05 Apr 2020 06:14:45 GMT

Hi,

thanks for this replay.

it give me list of unmapped lun.

i need more:

i need list of lun that in "map" state but the initiator are disconnect.

Arie Shenar

Re: how to find LUN not used ? (is there a way to fined orphan LUN?)

Ontapforrum — Sun, 05 Apr 2020 13:12:45 GMT

You can use following command: Look for the Initiators(host) 'not logged in' or disconnected:

::> igroup show -fields vserver,igroup,init-details
vserver igroup init-details
---------- ----------- ----------------------------------------------------------------
test test_grp "iqn.1991-05.com.microsoft:xxxx.online.local (not logged in)"

If you want to know to which LUN, these disconnected initiators (not logged in) belong to? Make a note of the igroup and run this command:
::> mapping show -igroup test_grp -fields vserver,lun

Hope this helps.