From owner-freebsd-arm@FreeBSD.ORG Tue Jul 1 09:25:50 2014 Return-Path: Delivered-To: freebsd-arm@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id BD860CB7 for ; Tue, 1 Jul 2014 09:25:50 +0000 (UTC) Received: from eu1sys200aog129.obsmtp.com (eu1sys200aog129.obsmtp.com [207.126.144.200]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 1A3002976 for ; Tue, 1 Jul 2014 09:25:49 +0000 (UTC) Received: from mail-wi0-f182.google.com ([209.85.212.182]) (using TLSv1) by eu1sys200aob129.postini.com ([207.126.147.11]) with SMTP ID DSNKU7J+gBVONHiTdS4wK05a/9pIhh8r0nrm@postini.com; Tue, 01 Jul 2014 09:25:50 UTC Received: by mail-wi0-f182.google.com with SMTP id bs8so7327228wib.9 for ; Tue, 01 Jul 2014 02:25:20 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:date:from:message-id:to:subject:reply-to; bh=xzOTapa808LuUVtZJ/DXhyAjGUxDOs0XVYlPCU55agQ=; b=MPOXnjl5U1ZakVRLMr4GwfZhQdv0EsmZp+Z7poy1idsAbArmbxXHtOO6LmjX1/weiB JOLzAhUR26p+BVqcHIoRPja9WN+T7LzX0jcz8+NGG/BP67AmA3+5j6BEsvCiOVA4KYN4 LwryU5yGtMVyNSxWtAiqCKHVfs8i7X2Isj6xa6xdrrZAcGPcnBy0dgHyhOxlz4avaAc0 Ktzbi5clsTjOCM8JwcEpe236FdkxJroYBbM9h63KOGsQ6RCSzyi2EaSAamU7nOCJqQpU V6f8OrdBE28cSMzF15h5vBACA7wAug6gaV2t6mu4KxPEpKoj5KV9+zaDO90tVSNucKD4 0zQQ== X-Gm-Message-State: ALoCoQlaOl+lpOg1AIfGnu4Mnwu2yvbDAEj5RsEZmpzGhSM9Lc/Ju664xImGfgOLWdU3cRyIXUnoeUeZHnZP+OKcO9rKqNtOCdW6b3a0yQAdEBMtNM/Hw2ARTYa1uxXET/pOZNyh9rYy X-Received: by 10.194.63.228 with SMTP id j4mr50450887wjs.7.1404206720084; Tue, 01 Jul 2014 02:25:20 -0700 (PDT) X-Received: by 10.194.63.228 with SMTP id j4mr50450877wjs.7.1404206719980; Tue, 01 Jul 2014 02:25:19 -0700 (PDT) Received: from mech-cluster241.men.bris.ac.uk (mech-cluster241.men.bris.ac.uk. [137.222.187.241]) by mx.google.com with ESMTPSA id 19sm46969479wjz.3.2014.07.01.02.25.18 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 01 Jul 2014 02:25:19 -0700 (PDT) Received: from mech-cluster241.men.bris.ac.uk (localhost [127.0.0.1]) by mech-cluster241.men.bris.ac.uk (8.14.8/8.14.8) with ESMTP id s619PIXX006680 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO) for ; Tue, 1 Jul 2014 10:25:18 +0100 (BST) (envelope-from mexas@mech-cluster241.men.bris.ac.uk) Received: (from mexas@localhost) by mech-cluster241.men.bris.ac.uk (8.14.8/8.14.8/Submit) id s619PHeT006679 for freebsd-arm@freebsd.org; Tue, 1 Jul 2014 10:25:17 +0100 (BST) (envelope-from mexas) Date: Tue, 1 Jul 2014 10:25:17 +0100 (BST) From: Anton Shterenlikht Message-Id: <201407010925.s619PHeT006679@mech-cluster241.men.bris.ac.uk> To: freebsd-arm@freebsd.org Subject: /tmp, /var/log, /var/tmp as /dev/md - why? Reply-To: mexas@bris.ac.uk X-BeenThere: freebsd-arm@freebsd.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: "Porting FreeBSD to ARM processors." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 01 Jul 2014 09:25:50 -0000 Why is it a good idea to mount /tmp and some var dirs on memory disks: root@raspberry-pi:/usr/ports # df -m Filesystem 1M-blocks Used Avail Capacity Mounted on /dev/mmcsd0s2a 14694 777 12742 6% / devfs 0 0 0 100% /dev /dev/mmcsd0s1 16 3 13 20% /boot/msdos /dev/md0 28 4 22 16% /tmp /dev/md1 14 0 12 0% /var/log /dev/md2 4 0 4 0% /var/tmp root@raspberry-pi:/usr/ports # Is this about speed or power, or maybe space? Can I not put all these dirs on sd card? I'm new to arm, so maybe things are different to other arches. Thanks Anton