Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Date:   Mon, 12 Jul 2021 10:34:01 +0100
From:   Stefan Hajnoczi <stefanha@redhat.com>
To:     Wenchao Hao <haowenchao@huawei.com>
Cc:     "James E.J. Bottomley" <jejb@linux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@oracle.com>,
        "Michael S. Tsirkin" <mst@redhat.com>,
        Jason Wang <jasowang@redhat.com>,
        Paolo Bonzini <pbonzini@redhat.com>,
        linux-scsi@vger.kernel.org,
        virtualization@lists.linux-foundation.org,
        linux-kernel@vger.kernel.org,
        Zhiqiang Liu <liuzhiqiang26@huawei.com>,
        Wu Bo <wubo40@huawei.com>, linfeilong@huawei.com,
        yuzhanzhan@huawei.com
Subject: Re: [bug report]scsi: drive letter drift problem
Message-ID: <YOwMiYRmGYskOn7A@stefanha-x1.localdomain>
References: <7ae2293e-71a9-f68e-0bfb-b4a70ecf493e@huawei.com>
MIME-Version: 1.0
Content-Type: multipart/signed; micalg=pgp-sha256;
        protocol="application/pgp-signature"; boundary="fuPUrc/TQtUWERHW"
Content-Disposition: inline
In-Reply-To: <7ae2293e-71a9-f68e-0bfb-b4a70ecf493e@huawei.com>
Precedence: bulk


--fuPUrc/TQtUWERHW
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
Content-Transfer-Encoding: quoted-printable

On Mon, Jul 12, 2021 at 12:47:05PM +0800, Wenchao Hao wrote:
> 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].
>=20
> Mostly, the device letter are assigned as following after reboot:
> [0:0:0:0] --> sda
> [0:0:1:0] --> sdb
>=20
> While in rare cases, the device letter shown as following:
> [0:0:0:0] --> sdb
> [0:0:1:0] --> sda
>=20
> 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?

Is there a stable ID that you can use in /dev/disk/by-*?

Stefan

--fuPUrc/TQtUWERHW
Content-Type: application/pgp-signature; name="signature.asc"

-----BEGIN PGP SIGNATURE-----

iQEzBAEBCAAdFiEEhpWov9P5fNqsNXdanKSrs4Grc8gFAmDsDIkACgkQnKSrs4Gr
c8hdnQf/Rs2fRaJYaSbQa32JKf0l4C/g6F+qFtbfnjBx97dzW6wb0+PPyavNMGmp
tWbISz6bIz3StkRv8oOstrJA1px9caorIZJTvXXBf036EJFtnOuZq9HF1enjybNw
RLFknEaavVlj6ay2ZkdxkIwCjGJtUcU/U6lXFGrWkwqScP6TOmhnV+l7nkcH74Kq
lffTF6TC6rqGMQNVpPzK4PueRMSuBzWL4TAol61w9o6pwGYnxCObOnQIF4QGj6cE
LKY89s8dbJG8SEN1LkUrqsd9NkV9Kd4lT67QEJd/qoWCBXFmL4mbF+ceJ5B0kL13
RM9O4ybPKVXqiWhprpNon4qvBfwo3w==
=0+Ee
-----END PGP SIGNATURE-----

--fuPUrc/TQtUWERHW--