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Sat, 2 May 2020 06:23:28 +0000 From: Paul Jones To: Zygo Blaxell CC: "linux-btrfs@vger.kernel.org" Subject: RE: Extremely slow device removals Thread-Topic: Extremely slow device removals Thread-Index: AQHWHxU9fUjJyg1lIUuFsK5nfSW3n6iR9/GAgADoaACAAUbYgIAAEiCQgAAWhQCAAAWQMA== Date: Sat, 2 May 2020 06:23:28 +0000 Message-ID: References: <8b647a7f-1223-fa9f-57c0-9a81a9bbeb27@ka9q.net> <14a8e382-0541-0f18-b969-ccf4b3254461@ka9q.net> <20200502033509.GG10769@hungrycats.org> <20200502060038.GK10769@hungrycats.org> In-Reply-To: <20200502060038.GK10769@hungrycats.org> Accept-Language: en-AU, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: umail.furryterror.org; dkim=none (message not signed) header.d=none;umail.furryterror.org; dmarc=none action=none header.from=pauljones.id.au; x-originating-ip: [60.242.55.46] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 251ae08f-6746-4dd9-01e2-08d7ee61543c x-ms-traffictypediagnostic: SYBPR01MB3321: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:4941; 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: pauljones.id.au X-MS-Exchange-CrossTenant-Network-Message-Id: 251ae08f-6746-4dd9-01e2-08d7ee61543c X-MS-Exchange-CrossTenant-originalarrivaltime: 02 May 2020 06:23:28.7452 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 8f216723-e13f-4cce-b84c-58d8f16a0082 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: 5RKXDdSVyyUN8grkWEcCmuZbG2Jloms26GXJzFVJmyoluloSDqgS55B6RqRL8NEIhO93pqJWSyXBzydqoaxmMQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SYBPR01MB3321 Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org > -----Original Message----- > From: Zygo Blaxell > Sent: Saturday, 2 May 2020 4:01 PM > To: Paul Jones > Cc: Phil Karn ; Jean-Denis Girard ; > linux-btrfs@vger.kernel.org > Subject: Re: Extremely slow device removals >=20 > > > > Delete seems to work like a balance. I've had a totally unbalanced > > raid 1 array and after removing a single almost full drive all the > > remaining drives are magically 50% full, down from 90% and up from > > 10%. It's a bit stressful when there is a missing disk as you can only > > delete a missing disk, not replace it. >=20 > Huh? Replacing missing disks is what btrfs replace is _for_. Oh I see where I went wrong. I used a command like=20 btrfs replace start missing /dev/sdf1 /mnt when I should have used btrfs replace start 999 /dev/sdf1 /mnt Yet another quirk of BTRFS...