I think I've got it. It is the emulate_tpu parameter on the target side. 
Needs some more confirmation, though

H. Giebels schrieb am Mittwoch, 26. Mai 2021 um 15:26:39 UTC+2:

>
> Hello,
>
> not exactly sure, wether this is an issue of targetcli or open iscsi. The 
> target lun is a sparse file, and I would like to be able to trim that lun 
> to reclaim free space. Think thin volume on a file backend. 
>
> Now iscsiadm -m session shows me (non-flash), what I suppose is the 
> reason, why I get an operation not permitted error when trying to so so. 
>
> The manpage talks about a flash node, but it is nowhere explained, what 
> that is and wether this is related to flash storage at all. So maybe there 
> is some documentation about the terms used?
>
> But primarily I would like to know, wether the information about the 
> trimability is a matter of the target advertising it or wether this has to 
> be defined during creation of the lun on the client side (-o new).
>
> Thanks
>
> Hermann
>
>
>

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