QNAP TS-653 Pro wont unmap Lun

[primey2000]

Hi,
This is a first time post and my QNAP has been performing flawlessly until recently and has started to really misbehave.
All LUNS are iSCSI targets and have been fine but now I need to perform some management on them and the QNAP is basically saying "no".

I am trying to unmap a 3TB LUN so I can delete it. I can confirm it is not being used as it is disabled but the interface sits at "Please wait" for a couple of minutes before throwing up and "Unknown Error" dialogue box.

The QNAP hasnt been rebooted in while a few weeks but is running fairly up to date firmware

Any help or ideas would be appreciated

Regards,
Paul

[primey2000]

Im running Firmware version 4.2.1 Build 20160601
Attached is a screen shot of the error

[storageman]

Do other LUNs share the same target, is there just one?

[primey2000]

No other luns. Just the one Lun/target which I want to delete.
I have unmapped and deleted some other luns. Just this one is stuck

[storageman]

No other luns. Just the one Lun/target which I want to delete.
I have unmapped and deleted some other luns. Just this one is stuck

Can't you stop the ISCSI service, then try to unmap/delete?

[primey2000]

Unfortunately no. There is a HyperV host and Hyper V cluster running on it so I cant take it offline with ease.

[storageman]

Unfortunately no. There is a HyperV host and Hyper V cluster running on it so I cant take it offline with ease.

Hang on you just told me this is the last LUN, so why can't you take it offline. Makes no sense.

[primey2000]

Sorry. I have different targets/luns setup. I have trying to remove unused Luns/targets.

[storageman]

Sorry. I have different targets/luns setup. I have trying to remove unused Luns/targets.

God, you don't make it easy, delete the target then (if that LUN has that specific target!!!). It should kill the mapping. Then delete the LUN.

[primey2000]

No need to be an **!