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=-2.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, 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 A9FD5C43331 for ; Tue, 31 Mar 2020 17:10:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7B10E20848 for ; Tue, 31 Mar 2020 17:10:05 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="cg9BpFv2" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730617AbgCaRKE (ORCPT ); Tue, 31 Mar 2020 13:10:04 -0400 Received: from mail-lf1-f48.google.com ([209.85.167.48]:39572 "EHLO mail-lf1-f48.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726595AbgCaRKE (ORCPT ); Tue, 31 Mar 2020 13:10:04 -0400 Received: by mail-lf1-f48.google.com with SMTP id h6so12183986lfp.6 for ; Tue, 31 Mar 2020 10:10:02 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:to:cc:references:from:autocrypt:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=uJkH/7LKL7xgMU1Vt1FBaoumaRoCcRpJ52BDLJ5kk1Y=; b=cg9BpFv22b4vML91j2A/E8vQWzvYccCoQUWIvE6T+yi6RdA+n8LuLi0V0JJXJlitmu EfAWaUFpuHG2Pid5dh1liHSoHm9VkGX5HNOjO5R68ZXDUt2fbiExvJ+4zBG8oJpPznOh XtIGYMPXhWulr5q4xJVRy67EG1dczPm0n6S6G0Zru2Rz0HiPaV4Hbw+CaEiLLncFfs2v Z+ruq3mH5iViuPvhX9j2rLw3X1SefovbE3o9K8zUPQq1tttvPI045MZ21YaGL6Ci3/dD qCBN7C8KfcWc/TMdKkvZviJIrTBXJWPhTVfyrQcDHcd98AsADxgJFAbnSwIupuhyljz5 znZw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:autocrypt :message-id:date:user-agent:mime-version:in-reply-to :content-language:content-transfer-encoding; bh=uJkH/7LKL7xgMU1Vt1FBaoumaRoCcRpJ52BDLJ5kk1Y=; b=VxdWUrTzyT8PtlNfo0ntoZHO6ABgz+PpxPy/KEfD7GRo038l1hV5Upz3bSO5D98/94 lTFYooN9mPuBb/bpdVJ2WaA46YbTB1N/x3y/bS8YIsFzQAZA4CzVZMd9mt1lkH1pOBHr NlTH5TS/hbOdv60kFlbxwABSyVGX+FdXtI/oAKC6kqDzwh/7mRkFn1pDtZ7eIkfZn2Iw zI8Y/ZKFlU0Xb0HrOaEZejI+QKlq8TH/zn64b+ifaadGfrXAY6YHU5HywBVXv97OW9RY 6FoXMUIE+5RrWpLnOCRDKQZZ1FjJpdBtqBwTuOD0JpkEkOYAlBe+rQ90Fn4Jh8N+7Li3 MV4w== X-Gm-Message-State: AGi0PuZTOkKkgf7xNmealfEHRA4GlMA6HQiTW/Qq4tcIzKcuddkGI3v8 3lILotDXk6q1Awm3pa/HGLO/boSj X-Google-Smtp-Source: APiQypKE4dqhellElwwue1MGxEjd91RzkU0u/3acEncQZKZJM5yvxR5p4x3692MZs3orW3qr7Sh/hQ== X-Received: by 2002:a05:6512:2e4:: with SMTP id m4mr12312064lfq.202.1585674601620; Tue, 31 Mar 2020 10:10:01 -0700 (PDT) Received: from ?IPv6:2a00:1370:812d:ea69:5e88:dcf1:68f5:44ed? ([2a00:1370:812d:ea69:5e88:dcf1:68f5:44ed]) by smtp.gmail.com with ESMTPSA id 8sm9061818lfk.64.2020.03.31.10.10.00 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 31 Mar 2020 10:10:00 -0700 (PDT) Subject: Re: Using Intel Optane to accelerate a BTRFS array? (equivalent of ZLOG/SIL for ZFS?) To: Eli V , Paul Jones Cc: Victor Hooi , linux-btrfs References: From: Andrei Borzenkov Autocrypt: addr=arvidjaar@gmail.com; prefer-encrypt=mutual; keydata= xsDiBDxiRwwRBAC3CN9wdwpVEqUGmSoqF8tWVIT4P/bLCSZLkinSZ2drsblKpdG7x+guxwts +LgI8qjf/q5Lah1TwOqzDvjHYJ1wbBauxZ03nDzSLUhD4Ms1IsqlIwyTLumQs4vcQdvLxjFs G70aDglgUSBogtaIEsiYZXl4X0j3L9fVstuz4/wXtwCg1cN/yv/eBC0tkcM1nsJXQrC5Ay8D /1aA5qPticLBpmEBxqkf0EMHuzyrFlqVw1tUjZ+Ep2LMlem8malPvfdZKEZ71W1a/XbRn8FE SOp0tUa5GwdoDXgEp1CJUn+WLurR0KPDf01E4j/PHHAoABgrqcOTcIVoNpv2gNiBySVsNGzF XTeY/Yd6vQclkqjBYONGN3r9R8bWA/0Y1j4XK61qjowRk3Iy8sBggM3PmmNRUJYgroerpcAr 2byz6wTsb3U7OzUZ1Llgisk5Qum0RN77m3I37FXlIhCmSEY7KZVzGNW3blugLHcfw/HuCB7R 1w5qiLWKK6eCQHL+BZwiU8hX3dtTq9d7WhRW5nsVPEaPqudQfMSi/Ux1kc0mQW5kcmVpIEJv cnplbmtvdiA8YXJ2aWRqYWFyQGdtYWlsLmNvbT7CZQQTEQIAJQIbAwYLCQgHAwIGFQgCCQoL BBYCAwECHgECF4AFAliWAiQCGQEACgkQR6LMutpd94wFGwCeNuQnMDxve/Fo3EvYIkAOn+zE 21cAnRCQTXd1hTgcRHfpArEd/Rcb5+SczsBNBDxiRyQQBACQtME33UHfFOCApLki4kLFrIw1 5A5asua10jm5It+hxzI9jDR9/bNEKDTKSciHnM7aRUggLwTt+6CXkMy8an+tVqGL/MvDc4/R KKlZxj39xP7wVXdt8y1ciY4ZqqZf3tmmSN9DlLcZJIOT82DaJZuvr7UJ7rLzBFbAUh4yRKaN nwADBwQAjNvMr/KBcGsV/UvxZSm/mdpvUPtcw9qmbxCrqFQoB6TmoZ7F6wp/rL3TkQ5UElPR gsG12+Dk9GgRhnnxTHCFgN1qTiZNX4YIFpNrd0au3W/Xko79L0c4/49ten5OrFI/psx53fhY vLYfkJnc62h8hiNeM6kqYa/x0BEddu92ZG7CRgQYEQIABgUCPGJHJAAKCRBHosy62l33jMhd AJ48P7WDvKLQQ5MKnn2D/TI337uA/gCgn5mnvm4SBctbhaSBgckRmgSxfwQ= Message-ID: <2ff672d4-875b-5242-96d6-1e248e2aa57a@gmail.com> Date: Tue, 31 Mar 2020 20:09:59 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org 31.03.2020 20:01, Eli V пишет: > > Another option is to put the 12TB drives in an mdadm RAID, and then > use the mdadm raid & the ssd for btrfs RAID1 metadata, with SINGLE > data on the the array. How do you restrict specific device for metadata only? > Currently, this will make roughly half of the > meta data lookups run at SSD speed, but there is a pending patch to > allow all the metadata reads to go to the SSD. This option is, of > course, only useful for speeding up metadata operations. It can make > large btrfs filesystems feel much more responsive in interactive use > however. >