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=-7.3 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 324FBC433DB for ; Sat, 16 Jan 2021 23:43:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E8D3322DA7 for ; Sat, 16 Jan 2021 23:43:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727255AbhAPXnC (ORCPT ); Sat, 16 Jan 2021 18:43:02 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37850 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726831AbhAPXmy (ORCPT ); Sat, 16 Jan 2021 18:42:54 -0500 Received: from zaphod.cobb.me.uk (zaphod.cobb.me.uk [IPv6:2001:41c8:51:983::131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A818DC061573 for ; Sat, 16 Jan 2021 15:42:13 -0800 (PST) Received: by zaphod.cobb.me.uk (Postfix, from userid 107) id C26F59C1B8; Sat, 16 Jan 2021 23:42:08 +0000 (GMT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cobb.uk.net; s=201703; t=1610840528; bh=Wuzwu8OwPze3seH83wRyTrp+Al8qKOfl53vLT5x+r1w=; h=To:From:Subject:Date:From; b=UKuZcdQbs1O6dyAC2BKddLpOICkP3eJqtYPrJI0BzxoCUl01gBHQjkdb5KfWiTir4 f86+tSpPOIowTLvRxee2vQ9Nv4wcdDMVp/I/2ZRdcmubvF85yJ1j2fRd26FGeSsxxy sULlDWaK4egVCH9kIqqvATSwPmlN1KKX/yoFDlHHHCoQmDFVklS/thnMhJmh9/kKre t2+wa3TbXxMYLtBJIoFY3RxwdrvE699y2RfRG+i6vuBQtkc+2lVJnQiYC72BaozhrJ S1FC6UVJM8RYEz/EOJugxCeBH3+oC4C7SykH/2I3Su27AiwPdH3vruEnS4+81Urp3C ZVSD1uNzhYD4Q== Received: from black.home.cobb.me.uk (unknown [192.168.0.205]) by zaphod.cobb.me.uk (Postfix) with ESMTP id 46A8F9B85D for ; Sat, 16 Jan 2021 23:42:05 +0000 (GMT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cobb.uk.net; s=201703; t=1610840525; bh=Wuzwu8OwPze3seH83wRyTrp+Al8qKOfl53vLT5x+r1w=; h=To:From:Subject:Date:From; b=pVob/CdX8T4D3E7YKV0L+c4hmD/YRUcra9Bsot86N1nlSfx9LJgOFVdre9djijE1i Psy6Ybe4rHPRa45FuNs2090QERwnGiZ8HTmz9ip3zF7C9mD5MOwR6XAzK/oECeBwgB xUdfVRp+XsppsNvdRv2uznKbajUL4nQ/UmJWwyXCfLGNRJ3PxsmzEuvs0zIamcuGdV R+AQjtGoDpyD5hGt1QH/l8BJiinLccobQZg60QDp4V2FxpuC9R4IbIXF/9o65L9ar3 10t42ITvu0RMZVc1wxyK/6/112WEu4d/yJn1FmrtXSUflgRkVTXmH89Sjjn+ycDpYL fGvZzc/7Vfn/Q== Received: from [192.168.0.211] (novatech.home.cobb.me.uk [192.168.0.211]) by black.home.cobb.me.uk (Postfix) with ESMTPS id 850E11D4F1A for ; Sat, 16 Jan 2021 23:42:04 +0000 (GMT) To: linux-btrfs@vger.kernel.org From: Graham Cobb Subject: NVME experience? Openpgp: preference=signencrypt Autocrypt: addr=g.btrfs@cobb.uk.net; prefer-encrypt=mutual; keydata= mQINBFaetnIBEAC5cHHbXztbmZhxDof6rYh/Dd5otxJXZ1p7cjE2GN9hCH7gQDOq5EJNqF9c VtD9rIywYT1i3qpHWyWo0BIwkWvr1TyFd3CioBe7qfo/8QoeA9nnXVZL2gcorI85a2GVRepb kbE22X059P1Z1Cy7c29dc8uDEzAucCILyfrNdZ/9jOTDN9wyyHo4GgPnf9lW3bKqF+t//TSh SOOis2+xt60y2In/ls29tD3G2ANcyoKF98JYsTypKJJiX07rK3yKTQbfqvKlc1CPWOuXE2x8 DdI3wiWlKKeOswdA2JFHJnkRjfrX9AKQm9Nk5JcX47rLxnWMEwlBJbu5NKIW5CUs/5UYqs5s 0c6UZ3lVwinFVDPC/RO8ixVwDBa+HspoSDz1nJyaRvTv6FBQeiMISeF/iRKnjSJGlx3AzyET ZP8bbLnSOiUbXP8q69i2epnhuap7jCcO38HA6qr+GSc7rpl042mZw2k0bojfv6o0DBsS/AWC DPFExfDI63On6lUKgf6E9vD3hvr+y7FfWdYWxauonYI8/i86KdWB8yaYMTNWM/+FAKfbKRCP dMOMnw7bTbUJMxN51GknnutQlB3aDTz4ze/OUAsAOvXEdlDYAj6JqFNdZW3k9v/QuQifTslR JkqVal4+I1SUxj8OJwQWOv/cAjCKJLr5g6UfUIH6rKVAWjEx+wARAQABtDNHcmFoYW0gQ29i YiAoUGVyc29uYWwgYWRkcmVzcykgPGdyYWhhbUBjb2JiLnVrLm5ldD6JAlEEEwECADsCGwEG CwkIBwMCBhUIAgkKCwQWAgMBAh4BAheAAhkBBQJWnr9UFRhoa3A6Ly9rZXlzLmdudXBnLm5l dAAKCRBv35GGXfm3Tte8D/45+/dnVdvzPsKgnrdoXpmvhImGaSctn9bhAKvng7EkrQjgV3cf C9GMgK0vEJu+4f/sqWA7hPKUq/jW5vRETcvqEp7v7z+56kqq5LUQE5+slsEb/A4lMP4ppwd+ TPwwDrtVlKNqbKJOM0kPkpj7GRy3xeOYh9D7DtFj2vlmaAy6XvKav/UUU4PoUdeCRyZCRfl0 Wi8pQBh0ngQWfW/VqI7VsG3Qov5Xt7cTzLuP/PhvzM2c5ltZzEzvz7S/jbB1+pnV9P7WLMYd EjhCYzJweCgXyQHCaAWGiHvBOpmxjbHXwX/6xTOJA5CGecDeIDjiK3le7ubFwQAfCgnmnzEj pDG+3wq7co7SbtGLVM3hBsYs27M04Oi2aIDUN1RSb0vsB6c07ECT52cggIZSOCvntl6n+uMl p0WDrl1i0mJUbztQtDzGxM7nw+4pJPV4iX1jJYbWutBwvC+7F1n2F6Niu/Y3ew9a3ixV2+T6 aHWkw7/VQvXGnLHfcFbIbzNoAvI6RNnuEqoCnZHxplEr7LuxLR41Z/XAuCkvK41N/SOI9zzT GLgUyQVOksdbPaxTgBfah9QlC9eXOKYdw826rGXQsvG7h67nqi67bp1I5dMgbM/+2quY9xk0 hkWSBKFP7bXYu4kjXZUaYsoRFEfL0gB53eF21777/rR87dEhptCnaoXeqbkBDQRWnrnDAQgA 0fRG36Ul3Y+iFs82JPBHDpFJjS/wDK+1j7WIoy0nYAiciAtfpXB6hV+fWurdjmXM4Jr8x73S xHzmf9yhZSTn3nc5GaK/jjwy3eUdoXu9jQnBIIY68VbgGaPdtD600QtfWt2zf2JC+3CMIwQ2 fK6joG43sM1nXiaBBHrr0IadSlas1zbinfMGVYAd3efUxlIUPpUK+B1JA12ZCD2PCTdTmVDe DPEsYZKuwC8KJt60MjK9zITqKsf21StwFe9Ak1lqX2DmJI4F12FQvS/E3UGdrAFAj+3HGibR yfzoT+w9UN2tHm/txFlPuhGU/LosXYCxisgNnF/R4zqkTC1/ao7/PQARAQABiQIlBBgBAgAP BQJWnrnDAhsMBQkJZgGAAAoJEG/fkYZd+bdO9b4P/0y3ADmZkbtme4+Bdp68uisDzfI4c/qo XSLTxY122QRVNXxn51yRRTzykHtv7/Zd/dUD5zvwj2xXBt9wk4V060wtqh3lD6DE5mQkCVar eAfHoygGMG+/mJDUIZD56m5aXN5Xiq77SwTeqJnzc/lYAyZXnTAWfAecVSdLQcKH21p/0AxW GU9+IpIjt8XUEGThPNsCOcdemC5u0I1ZeVRXAysBj2ymH0L3EW9B6a0airCmJ3Yctm0maqy+ 2MQ0Q6Jw8DWXbwynmnmzLlLEaN8wwAPo5cb3vcNM3BTcWMaEUHRlg82VR2O+RYpbXAuPOkNo 6K8mxta3BoZt3zYGwtqc/cpVIHpky+e38/5yEXxzBNn8Rn1xD6pHszYylRP4PfolcgMgi0Ny 72g40029WqQ6B7bogswoiJ0h3XTX7ipMtuVIVlf+K7r6ca/pX2R9B/fWNSFqaP4v0qBpyJdJ LO/FP87yHpEDbbKQKW6Guf6/TKJ7iaG3DDpE7CNCNLfFG/skhrh5Ut4zrG9SjA+0oDkfZ4dI B8+QpH3mP9PxkydnxGiGQxvLxI5Q+vQa+1qA5TcCM9SlVLVGelR2+Wj2In+t2GgigTV3PJS4 tMlN++mrgpjfq4DMYv1AzIBi6/bSR6QGKPYYOOjbk+8Sfao0fmjQeOhj1tAHZuI4hoQbowR+ myxb Message-ID: Date: Sat, 16 Jan 2021 23:42:03 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.9.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Language: en-GB Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org I am about to deploy my first btrfs filesystems on NVME. Does anyone have any hints or advice? Initially they will be root disks, but I am thinking about also moving home disks and other frequently used data to NVME, but probably not backups and other cold data. I am mostly wondering about non-functionals like typical failure modes, life and wear, etc. Which might affect decisions like how to split different filesystems among the drives, whether to mix NVME with other drives (SSD or HDD), etc. Are NVME drives just SSDs with a different interface? With similar lifetimes (by bytes written, or another measure)? And similar typical failure modes? Are they better or worse in terms of firmware bugs? Error detection for corrupted data? SMART or other indicators that they are starting to fail and should be replaced? I assume that they do not (in practice) suffer from "faulty cable" problems. Anyway, I am hoping someone has experiences to share which might be useful. Graham