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=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 084ABC33CB1 for ; Sat, 18 Jan 2020 11:08:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D2EE224694 for ; Sat, 18 Jan 2020 11:08:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726961AbgARLI6 (ORCPT ); Sat, 18 Jan 2020 06:08:58 -0500 Received: from mr013msb.fastweb.it ([85.18.95.104]:46030 "EHLO mr013msb.fastweb.it" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726953AbgARLI6 (ORCPT ); Sat, 18 Jan 2020 06:08:58 -0500 Received-SPF: pass (mr013msb.fastweb.it: domain assyoma.it designates 93.63.55.57 as permitted sender) identity=mailfrom; receiver=mr013msb.fastweb.it; client-ip=93.63.55.57; envelope-from=g.danti@assyoma.it; helo=ceres.assyoma.it; X-RazorGate-Vade: gggruggvucftvghtrhhoucdtuddrgedugedruddtgddvfecutefuodetggdotefrodftvfcurfhrohhfihhlvgemucfhtefuvfghgfeupdcuqfgfvfenuceurghilhhouhhtmecufedttdenucesvcftvggtihhpihgvnhhtshculddquddttddmnecujfgurhepvffugggtgfffhfhojghfkfigfgesthejjhdttdervdenucfhrhhomhepifhiohhnrghtrghnucffrghnthhiuceoghdruggrnhhtihesrghsshihohhmrgdrihhtqeenucffohhmrghinheprghsshihohhmrgdrihhtnecukfhppeelfedrieefrdehhedrheejnecurfgrrhgrmhephhgvlhhopegtvghrvghsrdgrshhshihomhgrrdhithdpihhnvghtpeelfedrieefrdehhedrheejpdhmrghilhhfrhhomhepoehgrdgurghnthhisegrshhshihomhgrrdhitheqpdhrtghpthhtohepoegurghrrhhitghkrdifohhnghesohhrrggtlhgvrdgtohhmqecuqfftvefrvfeprhhftgekvddvnegurghrrhhitghkrdifohhnghesohhrrggtlhgvrdgtohhmpdhrtghpthhtohepoehlihhnuhigqdigfhhssehvghgvrhdrkhgvrhhnvghlrdhorhhgqecuqfftvefrvfeprhhftgekvddvnehlihhnuhigqdigfhhssehvghgvrhdrkhgvrhhnvghlrdhorhhgnecuvehluhhsthgvrhfuihiivgeptd X-RazorGate-Vade-Verdict: clean 0 X-RazorGate-Vade-Classification: clean Received: from ceres.assyoma.it (93.63.55.57) by mr013msb.fastweb.it (5.8.208) id 5E19B49F007E1D1E; Sat, 18 Jan 2020 12:08:48 +0100 Received: by ceres.assyoma.it (Postfix, from userid 48) id 61AC1267FA8; Sat, 18 Jan 2020 12:08:48 +0100 (CET) To: "Darrick J. Wong" Subject: Re: XFS reflink vs ThinLVM X-PHP-Originating-Script: 0:rcube.php MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 7bit Date: Sat, 18 Jan 2020 12:08:48 +0100 From: Gionatan Danti Cc: linux-xfs@vger.kernel.org, g.danti@assyoma.it Organization: Assyoma s.r.l. In-Reply-To: <20200117234219.GM8257@magnolia> References: <627cb07f-9433-ddfd-37d7-27efedd89727@assyoma.it> <39b50e2c-cb78-3bcd-0130-defa9c573b71@assyoma.it> <20200113165341.GE8247@magnolia> <20200113180914.GI8247@magnolia> <8e96231f-8fc6-b178-9e83-84cbb9af6d2e@assyoma.it> <9d8e8614-9ae1-30ee-f2b4-1e45b90b27f8@assyoma.it> <20200115163948.GF8257@magnolia> <761fcf8f9d68ee221a35d15c1a7120c5@assyoma.it> <20200117234219.GM8257@magnolia> Message-ID: X-Sender: g.danti@assyoma.it User-Agent: Roundcube Webmail/1.0.12 Sender: linux-xfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-xfs@vger.kernel.org Il 18-01-2020 00:42 Darrick J. Wong ha scritto: > How many fragments, and how big of a sparse file? A just installed CentOS 8 guest using a 20 GB sparse file vdisk had about 2000 fragments. After running "fio --name=test --filename=test.img --rw=randwrite --size=4G" for about 30 mins, it ended with over 1M fragments/extents. At that point, reflinking that file took over 2 mins, and unlinking it about 4 mins. I understand fio randwrite pattern is a worst case scenario; still, I think the results are interesting and telling for "aged" virtual machines. As a side note, a just installed Win2019 guest backed with an 80 GB sparse file had about 18000 fragments. Thanks. -- Danti Gionatan Supporto Tecnico Assyoma S.r.l. - www.assyoma.it email: g.danti@assyoma.it - info@assyoma.it GPG public key ID: FF5F32A8