From owner-freebsd-fs@freebsd.org Mon Nov 30 05:00:34 2020 Return-Path: Delivered-To: freebsd-fs@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 5099946F3A8 for ; Mon, 30 Nov 2020 05:00:34 +0000 (UTC) (envelope-from pascal.guitierrez@gmail.com) Received: from mail-vs1-xe30.google.com (mail-vs1-xe30.google.com [IPv6:2607:f8b0:4864:20::e30]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (2048 bits) client-digest SHA256) (Client CN "smtp.gmail.com", Issuer "GTS CA 1O1" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4CktN14Dt3z4YyG for ; Mon, 30 Nov 2020 05:00:33 +0000 (UTC) (envelope-from pascal.guitierrez@gmail.com) Received: by mail-vs1-xe30.google.com with SMTP id p7so621974vsf.8 for ; Sun, 29 Nov 2020 21:00:33 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:from:date:message-id:subject:to; bh=b6jw1Xby454vQpLtKkM//QtWeP5ikQ0jVWCo2voofNw=; b=BsXcl/Y4+i56mNr5V/AeUPDoDTMuURojHDmpOqpvHIU7fTnrUVCsCZJ4mNx3/6bVGH hgj+L8pmAJoAXYyi4JK/QxllspmByy0eAvDgPifaZ8Vx0cluWY9S12n5MgovR2dZBHDv 6NeNV2D0fzP2Q/mDi54T65Ke4bxL8paM11AXwsaIomxofSV6StIvifxQNCEHwXNazghC 7xNfztl67gBJg7SDqGpiJ5eUqRj2o7u68AsAZd0h6+1TjnML5uChMIU5YgHrKnkZ/nnc mDSO/MJBH7sSEUYq+d6cgrl4s4A3wNZlLDbGApy28Pk6os9T+4Ek8JLV8k9CkCR9fdux l/qQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=b6jw1Xby454vQpLtKkM//QtWeP5ikQ0jVWCo2voofNw=; b=BqGe8Kc64ULDBV/thkgM+hyya4XLOjAiGiQ7K9h88i3dXMH6oQQJBuyi0vfkid4imf IeU0pBfnE0Shznig3UBw+80gp7rYuybxugIW8eKUGeR2vJEUBmm75Ov5khwhZzI/mDlN 9HYT8VJm35lfInVxg0fkXH9+7az4E5MK9UOQIzuoBAizOTffTr/CEgOqMUR83WTe4RWa hFujC9+nMDrOgQQ5ptRAXhCbpygNzu72AqtE+qDl7qH+wKdp8qLF+lIZIn/eT2f92nlv JDJv18Wci1weyp0MO5RYeFDMS3eymX8wCiYZzLxCGiMSK9yNBSTZcH5MnMmlVgW4EwrR nA8g== X-Gm-Message-State: AOAM530I9bSG4EFmUWGaUN40hRuIyKSKBTdjf/Qpm0U+bgmbJ6kBTOkH A/P5cL+HIuieIzU0MSwiJU35iST+qbUylTW5lsHLwOudmZI= X-Google-Smtp-Source: ABdhPJx8k6bfd0+witGAMxT2sQ6X8oLXUY6CQ7Xpx7QV04ydFjUtWCiwQYhypEHl3XEaJIe1H8Mr1rnuiZEk64bpb2Q= X-Received: by 2002:a67:ce1a:: with SMTP id s26mr13854025vsl.0.1606712432478; Sun, 29 Nov 2020 21:00:32 -0800 (PST) MIME-Version: 1.0 From: Pascal Guitierrez Date: Mon, 30 Nov 2020 16:00:21 +1100 Message-ID: Subject: Special allocation classes sizing To: freebsd-fs@freebsd.org X-Rspamd-Queue-Id: 4CktN14Dt3z4YyG X-Spamd-Bar: -- Authentication-Results: mx1.freebsd.org; dkim=pass header.d=gmail.com header.s=20161025 header.b=BsXcl/Y4; dmarc=pass (policy=none) header.from=gmail.com; spf=pass (mx1.freebsd.org: domain of pascalguitierrez@gmail.com designates 2607:f8b0:4864:20::e30 as permitted sender) smtp.mailfrom=pascalguitierrez@gmail.com X-Spamd-Result: default: False [-2.02 / 15.00]; FREEMAIL_FROM(0.00)[gmail.com]; R_SPF_ALLOW(-0.20)[+ip6:2607:f8b0:4000::/36]; TO_DN_NONE(0.00)[]; DKIM_TRACE(0.00)[gmail.com:+]; DMARC_POLICY_ALLOW(-0.50)[gmail.com,none]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+,1:+,2:~]; RBL_DBL_DONT_QUERY_IPS(0.00)[2607:f8b0:4864:20::e30:from]; FREEMAIL_ENVFROM(0.00)[gmail.com]; ASN(0.00)[asn:15169, ipnet:2607:f8b0::/32, country:US]; TAGGED_FROM(0.00)[]; DWL_DNSWL_NONE(0.00)[gmail.com:dkim]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-1.000]; R_DKIM_ALLOW(-0.20)[gmail.com:s=20161025]; FROM_HAS_DN(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; MIME_GOOD(-0.10)[multipart/alternative,text/plain]; PREVIOUSLY_DELIVERED(0.00)[freebsd-fs@freebsd.org]; RCPT_COUNT_ONE(0.00)[1]; SPAMHAUS_ZRD(0.00)[2607:f8b0:4864:20::e30:from:127.0.2.255]; NEURAL_SPAM_SHORT(0.98)[0.980]; RCVD_IN_DNSWL_NONE(0.00)[2607:f8b0:4864:20::e30:from]; RCVD_COUNT_TWO(0.00)[2]; RCVD_TLS_ALL(0.00)[]; MAILMAN_DEST(0.00)[freebsd-fs] Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Content-Filtered-By: Mailman/MimeDel 2.1.34 X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 30 Nov 2020 05:00:34 -0000 Hi there, We are looking at migrating a rather large existing pool of around 400TB onto a new pool, taking advantage of the special allocation classes in 12.2-RELEASE (just using the default special, not dedup or small_blocks). I am about to procure the hardware needed, however I=E2=80=99m not sure how= big to make the special storage layer. Is there a rough estimate calculation or perhaps I can run zdb on the existing pool to get an estimate? Thanks for your time