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=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 2F5ACCA9EA0 for ; Fri, 25 Oct 2019 08:35:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 03D4B2070B for ; Fri, 25 Oct 2019 08:35:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2405781AbfJYIfh (ORCPT ); Fri, 25 Oct 2019 04:35:37 -0400 Received: from mx3.molgen.mpg.de ([141.14.17.11]:41209 "EHLO mx1.molgen.mpg.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S2404589AbfJYIfh (ORCPT ); Fri, 25 Oct 2019 04:35:37 -0400 Received: from rabammel.molgen.mpg.de (rabammel.molgen.mpg.de [141.14.30.220]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: pmenzel) by mx.molgen.mpg.de (Postfix) with ESMTPSA id 3921A20225AF6; Fri, 25 Oct 2019 10:35:35 +0200 (CEST) Subject: Re: File system for scratch space (in HPC cluster) To: Andreas Dilger Cc: Linux FS-devel Mailing List , Linux Kernel Mailing List , Donald Buczek References: <2794A217-0A93-44C1-B0A2-A67504A711F0@dilger.ca> From: Paul Menzel Message-ID: Date: Fri, 25 Oct 2019 10:35:34 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.0 MIME-Version: 1.0 In-Reply-To: <2794A217-0A93-44C1-B0A2-A67504A711F0@dilger.ca> Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="------------ms000700060301000804050100" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This is a cryptographically signed message in MIME format. --------------ms000700060301000804050100 Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable Dear Andreas, On 2019-10-24 19:51, Andreas Dilger wrote: > On Oct 24, 2019, at 4:43 AM, Paul Menzel =20 > wrote: >> In our cluster, we offer scratch space for temporary files. As=20 >> these files are temporary, we do not need any safety requirements >> =E2=80=93 especially not those when the system crashes or shuts down. = So >> no `sync` is for example needed. >>=20 >> Are there file systems catering to this need? I couldn=E2=80=99t find = any?=20 >> Maybe I missed some options for existing file systems. >=20 > How big do you need the scratch filesystem to be? Is it local to > the node or does it need to be shared between nodes? In this case local. > If it needs to be large and shared between nodes then Lustre is=20 > typically used for this. If it is local and relatively small you=20 > could consider using tmpfs backed by swab on an NVMe flash device=20 > (M.2 or U.2, Optane if you can afford it) inside the node. >=20 > That way you get RAM-like performance for many files, with a larger=20 > capacity than RAM when needed (tmpfs can use swap). >=20 > You might consider to mount a new tmpfs filesystem per job (no=20 > formatting is needed for tmpfs), and then unmount it when the job is=20 > done, so that the old files are automatically cleaned up. That is a good idea, but probably not practical for 10 TB. Out of curiosity, what is the limit for =E2=80=9Crelatively small=E2=80=9D in yo= ur experience? 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