linux-kernel - [bug report]scsi: drive letter drift problem

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Message-ID: <7ae2293e-71a9-f68e-0bfb-b4a70ecf493e@huawei.com>
Date:   Mon, 12 Jul 2021 12:47:05 +0800
From:   Wenchao Hao <haowenchao@...wei.com>
To:     "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        "Jason Wang" <jasowang@...hat.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        "Stefan Hajnoczi" <stefanha@...hat.com>,
        <linux-scsi@...r.kernel.org>,
        <virtualization@...ts.linux-foundation.org>,
        <linux-kernel@...r.kernel.org>
CC:     Zhiqiang Liu <liuzhiqiang26@...wei.com>, Wu Bo <wubo40@...wei.com>,
        <linfeilong@...wei.com>, <yuzhanzhan@...wei.com>,
        <haowenchao@...wei.com>
Subject: [bug report]scsi: drive letter drift problem

We deploy two SCSI disk in one SCSI host(virtio-scsi bus) for one 
machine, whose ids are [0:0:0:0] and [0:0:1:0].

Mostly, the device letter are assigned as following after reboot:
[0:0:0:0] --> sda
[0:0:1:0] --> sdb

While in rare cases, the device letter shown as following:
[0:0:0:0] --> sdb
[0:0:1:0] --> sda

Could we guarantee "sda" is assigned to [0:0:0:0] and "sdb" is assigned 
to [0:0:1:0] or not?
If we can, then how?