Detecting unused LUNs

Mapped and online LUNs can remain unused in a filer because a connected initiator is missing.

With the NetApp-CLI, such LUNS can be detected by following these steps:

First, we look for initiator groups for which all initiators are not logged in.

node01::> lun igroup show -igroup *group06* -instance

Vserver Name: Node01A1
Igroup Name: group061a
Protocol: fcp
OS Type: windows
Portset Binding Igroup: fc_pset_1
Igroup UUID: ****
ALUA: true
Initiators: 10:00:00:00:c9:74:b6:f9 (not logged in)
            10:00:00:00:c9:74:b7:b5 (not logged in)

Vserver Name: Node01A1
Igroup Name: group062a
Protocol: fcp
OS Type: windows
Portset Binding Igroup: fc_pset_1
Igroup UUID: ****
ALUA: true
Initiators: 10:00:00:00:c9:74:9b:f1 (not logged in)
            10:00:00:00:c9:74:b2:91 (not logged in)

Next, we can search for the LUNs:

node01::> lun mapping show -igroup group06*
Vserver    Path                              Igroup   LUN ID
---------- --------------------------------  -------  ------
Node01A1   /vol/group061a/group061a_2        group061a      1
Node01A1   /vol/group061a/rbgs061a_1         group061a      0
Node01A1   /vol/group062a/group062a_1        group062a      0
Node01A1   /vol/group062a/group062a_2        group062a      1

We would like to automate this process with a check, so that one can check for unused LUNs on a regular basis and any found LUNs can be suggested to the storage admin for deletion.