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

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Message-ID: <Y5waEc0iqfGkkN7f@infradead.org>
Date:   Thu, 15 Dec 2022 23:11:13 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Ulrich Windl <Ulrich.Windl@...uni-regensburg.de>
Cc:     haowenchao@...wei.com, open-iscsi <open-iscsi@...glegroups.com>,
        linfeilong@...wei.com, liuzhiqiang26@...wei.com,
        jejb@...ux.ibm.com, martin.petersen@...cle.com,
        michael.christie@...cle.com, Chris Leech <cleech@...hat.com>,
        Lee Duncan <lduncan@...e.com>, linux-kernel@...r.kernel.org,
        linux-scsi@...r.kernel.org
Subject: Re: Antw: [EXT] Re: [PATCH 0/2] scsi:donot skip lun if inquiry
 returns PQ=1 for all hosts

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.