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Wong" , Johannes Thumshirn , Josef Bacik Subject: Re: [PATCH v10 05/41] btrfs: check and enable ZONED mode Thread-Topic: [PATCH v10 05/41] btrfs: check and enable ZONED mode Thread-Index: AQHWt1SX6TBkGrIRlEa+5WXQUx+StA== Date: Tue, 1 Dec 2020 11:27:21 +0000 Message-ID: References: <104218b8d66fec2e4121203b90e7673ddac19d6a.1605007036.git.naohiro.aota@wdc.com> <51c91510-6014-0dee-a456-b50648f48156@oracle.com> <20201127184439.GB6430@twin.jikos.cz> <4a784d16-b325-bf32-5ce5-0718c6bce252@oracle.com> <1dc43899-82de-564f-6e52-bd5b990f3887@cobb.uk.net> <20201201111146.GA30215@infradead.org> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: infradead.org; dkim=none (message not signed) header.d=none;infradead.org; dmarc=none action=none header.from=wdc.com; x-originating-ip: [129.253.182.59] x-ms-publictraffictype: Email x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: 00c0f1ea-0d7b-4bda-0dec-08d895ec11ab x-ms-traffictypediagnostic: CH2PR04MB7078: x-ld-processed: b61c8803-16f3-4c35-9b17-6f65f441df86,ExtAddr x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: wdcipoutbound: EOP-TRUE x-ms-oob-tlc-oobclassifiers: OLM:6790; x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: cWKyFKFwBDZZ6nQtoS9DDbG61oOi9hQ51rgHIDmR9auxe1TOrRt1+x1GofRCgCquyl0ovNV52NZ+oMl6JZjspMF6ouiki8HiiNAM2t9iq5NHq7p3t5fmZO+hfBxgPUxKGhIyhQghwJpEi3Ed42z4q2FWgP6MUTlpJXPrCSYCycX9K2jx9HEKHvQaJXtg6Qb3ItxfN3yFDmixI33nErzrephD2rHOp3QLjVJhqcog8gRt/ZTYjvo5M8FNQ6vuM1Rz2qrMDF33spsyNRLtcCTHELrS8vcsNYaZJZturfTk705aURiJ368VxDSZrzzrsj/SC1oIKfAOweuL0EJWyft7BQ== x-forefront-antispam-report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:CH2PR04MB6522.namprd04.prod.outlook.com;PTR:;CAT:NONE;SFS:(4636009)(396003)(346002)(376002)(366004)(39860400002)(136003)(76116006)(86362001)(478600001)(83380400001)(316002)(9686003)(6916009)(4744005)(7696005)(4326008)(186003)(66946007)(91956017)(64756008)(53546011)(55016002)(26005)(71200400001)(8936002)(7416002)(66476007)(66556008)(5660300002)(2906002)(54906003)(8676002)(52536014)(6506007)(33656002)(66446008);DIR:OUT;SFP:1102; x-ms-exchange-antispam-messagedata: =?us-ascii?Q?sQ/msObhU9YNEcIQ36X/fqWjFlpHof0Pwk0VqO1AF0DwhGsXWtDQdvlC9L2k?= =?us-ascii?Q?EuffoNpEpBYD9jIciELOcw0QKxNlv071Lk6OZogXKG6Lk1hbmEX+5LAey7Mr?= =?us-ascii?Q?lhLuJ1rtMaxPb/k+z1ZFz78FjaRhQLbQq7BKLY2Sp8E0IzUBPJVsCy6LcyET?= =?us-ascii?Q?3hFIXbnak3nUBlNIJd7cQYBP9dx9x4m2N4MeMjgXojTSp34EemVFggRafmNB?= =?us-ascii?Q?uuzgvH9HRcwIOcR20v5zvjInukAYWaKmA66HtOpma/rn2DRxnQRyBpsYoTbt?= =?us-ascii?Q?fXTxLcvZU8H1Z1ez5Mlu7Fa6mcZrrXrA20YCQh/9e2Rsv1JMr39FIcUWwLy8?= =?us-ascii?Q?orXQrbAPoffSM4GEfCzUf2xntiq9DNjpn1VLPquxBCnxVZmg2jCoscg6FPRi?= =?us-ascii?Q?jy5icahTPWAmBktZ9mO51r4by2lz3aPx8veQXwcxdjiv8uihIotWr6goHvZz?= =?us-ascii?Q?c4AII1rgYsrEoRRa20dr7OdvrcaNtZXOcAckIqjHKx8pLproyAE1e5T5Vxkc?= =?us-ascii?Q?/auyechSn+IUq+abUcnT5/0MxsqzakkBZv3sID4551WJB+Q4c+6tI536FqEh?= =?us-ascii?Q?kTrC4PcTnm9f7qgvxkkKzBOzRwLyBzWHWDynfU8/cpF8RGEDPrZspWrV/YHX?= =?us-ascii?Q?XDvoyakC9HDjIjH8Ouz0WBXwtPchbEhr5OaUGTVm0u70gI9N3nw4D19n8fHg?= =?us-ascii?Q?toFqy4Z8qY8T9tBPXOS087hWqJ9hFSdR2lRZEo7dhO+QNffKDcpDHsGHAZgp?= =?us-ascii?Q?EmhSS4WkHNsx76riVaWOolizzL28JJyrXV5VeqCQRNn1YRWuCurGPhldTrFS?= =?us-ascii?Q?cEMt1bxHOujJH85EF0GAh6M3kxWBErwIimoyuyVYTQ9t5+VYyTetQ5iWMDp9?= =?us-ascii?Q?Gw6zyugS7dSC7xwZo4leGVW1PyuA8GyN+aVgwWXyp6SOykMQ3GF/zD1Pn5B/?= =?us-ascii?Q?Hbfnp6rtpvpCjXr+ATufLRQO3H0HXEL/oCXQAgLwOmKmpwEQXIncjzcNndm6?= =?us-ascii?Q?pFD0?= Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: wdc.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: CH2PR04MB6522.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 00c0f1ea-0d7b-4bda-0dec-08d895ec11ab X-MS-Exchange-CrossTenant-originalarrivaltime: 01 Dec 2020 11:27:21.2764 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: b61c8803-16f3-4c35-9b17-6f65f441df86 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: KO+nUdmYVht5pSPeuf7cmfiA2HgZCcfhpWazEY9za5p03tYRV/cxICncahae7wDaAvPPb+sYEZ+LMuv3bkuZQA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH2PR04MB7078 Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org On 2020/12/01 20:11, hch@infradead.org wrote:=0A= > On Tue, Dec 01, 2020 at 11:03:35AM +0000, Damien Le Moal wrote:=0A= >> Well, not really. HA drives, per specifications, are backward compatible= . If=0A= >> they are partitioned, the block layer will force a regular drive mode us= e,=0A= >> hiding their zoned interface, which is completely optional to use in the= first=0A= >> place.=0A= >>=0A= >> If by "untested territory" you mean the possibility of hitting drive FW = bugs=0A= >> coming from the added complexity of internal GC, then I would argue that= this is=0A= >> a common territory for any FS on any drive, especially SSDs: device FW b= ugs do=0A= >> exist and show up from time to time, even on the simplest of drives.=0A= > =0A= > Also note that most cheaper hard drives are using SMR internally,=0A= > you'll run into the same GC "issues" as with a HA drive that is used for= =0A= > random writes.=0A= =0A= Indeed. Good point !=0A= =0A= -- =0A= Damien Le Moal=0A= Western Digital Research=0A=