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Tue, 27 Apr 2021 08:10:53 +0000 From: Martin Wilck To: "erwin@erwinvanlonden.net" , "Ulrich.Windl@rz.uni-regensburg.de" , "martin.petersen@oracle.com" CC: "jejb@linux.vnet.ibm.com" , "linux-scsi@vger.kernel.org" , "dgilbert@interlog.com" , "dm-devel@redhat.com" , "systemd-devel@lists.freedesktop.org" , Hannes Reinecke , "hch@lst.de" Subject: Re: [dm-devel] RFC: one more time: SCSI device identification Thread-Topic: [dm-devel] RFC: one more time: SCSI device identification Thread-Index: AQHXOp5vFUyf6ZqRIUKuQYht/xcQrqrHuyoAgABJRgA= Date: Tue, 27 Apr 2021 08:10:53 +0000 Message-ID: <15e1a6a493f55051eab844bab2a107f783dc27ee.camel@suse.com> References: <06489ea37311fe7bf73b27a41b5209ee4cca85fe.camel@suse.com> <685c40341d2ddef2fe5a54dd656d10104b0c1bfa.camel@suse.com> <6086A0B2020000A100040BBE@gwsmtp.uni-regensburg.de> <59dc346de26997a6b8e3ae3d86d84ada60b3d26b.camel@suse.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Evolution 3.38.4 authentication-results: erwinvanlonden.net; 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charset="iso-8859-15" Content-ID: Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: suse.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: DB8PR04MB6555.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 5068325c-fee6-40da-9d8b-08d90953fa56 X-MS-Exchange-CrossTenant-originalarrivaltime: 27 Apr 2021 08:10:53.5912 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: f7a17af6-1c5c-4a36-aa8b-f5be247aa4ba X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: F/JzZKcgQHJp5tNYtLPR6dGxMzJFCF6LHQcezUve6j3xMSj7a30TClONtLhOkS8nGg8bU/tMr7QidmZN3xK4EA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DBAPR04MB7351 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org On Tue, 2021-04-27 at 13:48 +1000, Erwin van Londen wrote: > >=20 > > Wrt 1), we can only hope that it's the case. But 2) and 3) need work, > > afaics. > >=20 > In my view the WWID should never change.=A0 In an ideal world, perhaps not. But in the dm-multipath realm, we know that WWID changes can happen with certain storage arrays. See=A0 https://listman.redhat.com/archives/dm-devel/2021-February/msg00116.html=A0 and follow-ups, for example. Regards, Martin --=20 Dr. Martin Wilck , Tel.=A0+49 (0)911 74053 2107 SUSE Software Solutions Germany GmbH HRB 36809, AG N=FCrnberg GF: Felix Imend=F6rffer From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,PDS_BAD_THREAD_QP_64, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4348CC433ED for ; Tue, 27 Apr 2021 08:13:25 +0000 (UTC) Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [216.205.24.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 82EED61289 for ; Tue, 27 Apr 2021 08:13:24 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 82EED61289 Authentication-Results: mail.kernel.org; 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Similar Internal Domain=false; Similar Monitored External Domain=false; Custom External Domain=false; Mimecast External Domain=false; Newly Observed Domain=false; Internal User Name=false; Custom Display Name List=false; Reply-to Address Mismatch=false; Targeted Threat Dictionary=false; Mimecast Threat Dictionary=false; Custom Threat Dictionary=false X-Scanned-By: MIMEDefang 2.78 on 10.11.54.4 X-MIME-Autoconverted: from quoted-printable to 8bit by lists01.pubmisc.prod.ext.phx2.redhat.com id 13R8B7aE021951 X-loop: dm-devel@redhat.com Cc: Hannes Reinecke , "systemd-devel@lists.freedesktop.org" , "linux-scsi@vger.kernel.org" , "dm-devel@redhat.com" , "dgilbert@interlog.com" , "jejb@linux.vnet.ibm.com" , "hch@lst.de" Subject: Re: [dm-devel] RFC: one more time: SCSI device identification X-BeenThere: dm-devel@redhat.com X-Mailman-Version: 2.1.12 Precedence: junk List-Id: device-mapper development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dm-devel-bounces@redhat.com Errors-To: dm-devel-bounces@redhat.com X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=dm-devel-bounces@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-ID: Content-Type: text/plain; charset="iso-8859-15" Content-Transfer-Encoding: quoted-printable On Tue, 2021-04-27 at 13:48 +1000, Erwin van Londen wrote: > >=20 > > Wrt 1), we can only hope that it's the case. But 2) and 3) need work, > > afaics. > >=20 > In my view the WWID should never change.=A0 In an ideal world, perhaps not. But in the dm-multipath realm, we know that WWID changes can happen with certain storage arrays. See=A0 https://listman.redhat.com/archives/dm-devel/2021-February/msg00116.html=A0 and follow-ups, for example. Regards, Martin --=20 Dr. Martin Wilck , Tel.=A0+49 (0)911 74053 2107 SUSE Software Solutions Germany GmbH HRB 36809, AG N=FCrnberg GF: Felix Imend=F6rffer -- dm-devel mailing list dm-devel@redhat.com https://listman.redhat.com/mailman/listinfo/dm-devel