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

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Message-Id: <639AD5C0020000A100050749@gwsmtp.uni-regensburg.de>
Date:   Thu, 15 Dec 2022 09:07:28 +0100
From:   "Ulrich Windl" <Ulrich.Windl@...uni-regensburg.de>
To:     <haowenchao@...wei.com>
Cc:     "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: Antw: [EXT] Re: [PATCH 0/2] scsi:donot skip lun if inquiry
 returns PQ=1 for all hosts

>>> Christoph Hellwig <hch@...radead.org> schrieb am 15.12.2022 um 08:06 in
Nachricht <Y5rHX95Vvl1aLhbp@...radead.org>:
> On Wed, Dec 14, 2022 at 03:08:44PM +0800, Wenchao Hao wrote:
>> When iSCSI initiator logged in target, the target attached none valid
>> lun but lun0. lun0 is not an valid disk, while it would response
>> inquiry command with PQ=1 and other general scsi commands like probe lun.
>> The others luns of target is added/removed dynamicly.
> 
> I can't find any special casing of LUN0 in RFC7144, can you clarify
> where you think that treats LUN0 any differently than other transports?

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.

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