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=-2.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, 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 91D71C433C1 for ; Sat, 20 Mar 2021 18:02:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5CB0061944 for ; Sat, 20 Mar 2021 18:02:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229769AbhCTSCB (ORCPT ); Sat, 20 Mar 2021 14:02:01 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42330 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229618AbhCTSBr (ORCPT ); Sat, 20 Mar 2021 14:01:47 -0400 Received: from mail-io1-xd2c.google.com (mail-io1-xd2c.google.com [IPv6:2607:f8b0:4864:20::d2c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 64CD5C061574 for ; Sat, 20 Mar 2021 11:01:47 -0700 (PDT) Received: by mail-io1-xd2c.google.com with SMTP id b10so9568131iot.4 for ; Sat, 20 Mar 2021 11:01:47 -0700 (PDT) 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=xv0/FXo7vLB8EP9ZpwwhF3boJq4xF+sC7ED2yZjHieI=; b=kfYBuUCB4nNH0hIplm/v7ZW41YFISEOH3u1dZyZWIMITx23M8CCckERSuXDLbp+tmK 9yrol4khawdpqzVs6rHCrCM86H1Q0wmxTJhcpqLCfIyzBA5XZE9c6cokDVYW+417sCzR Adb7ZZmrt+4rUk6w/zma2w9aGsgsKFfvmH25Re+1XyA3RLbKBJVSDhjQQLv1gZfPmdp/ Svt/4HkWe7cW7s1215u357Mcfd94ztXzKf1XHqlxF2edRAoBOaVBkctXKtT1D+YzMWfg a+/04A8N0zd80MNDJrT+88srRlrWRn58HVUpfx7XE6jzltVMq4caS1dIJW2GqxsNEi02 iqJQ== 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=xv0/FXo7vLB8EP9ZpwwhF3boJq4xF+sC7ED2yZjHieI=; b=diDFLDqTZ0xu0PJbfwrYW76ROEVvDLXJNKHXJ45rDVWD9mwwH3e5DUxRSXXIBwS3y+ 0b36x79P/jSkMlYcdZNohuS3pb/zPyo1eYjm5U+wQaErw+bR0iPZl2oqu+oBB8CPdqql zDyyZxMfQwJa7lB6QrKy7hS09GPfmt44J2s4n2KVJ1Sw41RmzBYrmM5L/HoYAnW0s9R1 iaeGYS7+AysubZO5ivVQVA6TPLZLUTQIe253HUPbeL0mzH5AHltVAqKKvV3osG6YCEim 07RDyLw8eowQkmfgdeIAuTsUCnPCzvs5xpCDnMBccLPGJB1Nbs2VwK5S0YFzc+TMFnCE ZvWQ== X-Gm-Message-State: AOAM530ZM12BSxyIJ4ZTmYMMHeirmZtW3UxM3DnJsZNK3rkwWN+IiFue a6bHAPrOkBhGpqJSyvtCDFiZh84pOJ6yjWXHp4io+Vc5SJ6kIw== X-Google-Smtp-Source: ABdhPJwidLGWpTF8vM4NWQo4XXLZP3+QGwBh5uT+/Rx/ohaAUMoSx8qpiGOqmAlvdhZkbOxxEnCYFh2n/tR0urWdjLk= X-Received: by 2002:a02:cd33:: with SMTP id h19mr5617819jaq.88.1616263306714; Sat, 20 Mar 2021 11:01:46 -0700 (PDT) MIME-Version: 1.0 From: =?UTF-8?Q?Ralf_Gro=C3=9F?= Date: Sat, 20 Mar 2021 19:01:37 +0100 Message-ID: Subject: memory requirements for a 400TB fs with reflinks To: linux-xfs@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-xfs@vger.kernel.org Hi, I plan to deploy a couple of Linux (RHEL 8.x) server as Veeam backup repositories. Base for this might be high density server with 58 x 16TB disks, 2x RAID 60, each with its own raid controller and 28 disks. So each RAID 6 has 14 disks, + 2 globale spare. I wonder what memory requirement such a server would have, is there any special requirement regarding reflinks? I remember that xfs_repair has been a problem in the past, but my experience with this is from 10 years ago. Currently I plan to use 192GB RAM, this would be perfect as it utilizes 6 memory channels and 16GB DIMMs are not so expensive. Thanks - Ralf