Re: Antw: [EXT] Re: [PATCH 0/2] scsi:donot skip lun if inquiry returns PQ=1 for all hosts

[Christoph Hellwig]

On Thu, Dec 15, 2022 at 09:07:28AM +0100, Ulrich Windl wrote:
> Actusally I have no idea, but as a user of FC SAN systems I can remember a case when a storage system had to present a dummy LUN0 to enable hosts to find other LUNs (while LUN0 was never actually used). Maybe the client code was imperfect, I don't know.

Ignoring some of the well known LU bits that never really became
practically relevant, lun0 is needed to use the REPORT_LUNS command
to scane for the other logical units.  But unless the PQ says it
actually is a valid logic unit, we never add a sdev for it.