From owner-freebsd-questions@freebsd.org Tue Aug 25 11:47:04 2015 Return-Path: Delivered-To: freebsd-questions@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 16B0F99DA4E for ; Tue, 25 Aug 2015 11:47:04 +0000 (UTC) (envelope-from matthew@FreeBSD.org) Received: from smtp.infracaninophile.co.uk (smtp.infracaninophile.co.uk [IPv6:2001:8b0:151:1:3cd3:cd67:fafa:3d78]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.infracaninophile.co.uk", Issuer "infracaninophile.co.uk" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id 9B428DB4 for ; Tue, 25 Aug 2015 11:47:03 +0000 (UTC) (envelope-from matthew@FreeBSD.org) Received: from zero-gravitas.local (no-reverse-dns.metronet-uk.com [85.199.232.226] (may be forged)) (authenticated bits=0) by smtp.infracaninophile.co.uk (8.15.2/8.15.2) with ESMTPSA id t7PBkrwx025629 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NO) for ; Tue, 25 Aug 2015 12:46:54 +0100 (BST) (envelope-from matthew@FreeBSD.org) Authentication-Results: smtp.infracaninophile.co.uk; dmarc=none header.from=FreeBSD.org DKIM-Filter: OpenDKIM Filter v2.10.3 smtp.infracaninophile.co.uk t7PBkrwx025629 Authentication-Results: smtp.infracaninophile.co.uk/t7PBkrwx025629; dkim=none; dkim-atps=neutral X-Authentication-Warning: lucid-nonsense.infracaninophile.co.uk: Host no-reverse-dns.metronet-uk.com [85.199.232.226] (may be forged) claimed to be zero-gravitas.local Subject: Re: How to minimize the number of writes to CF card? To: freebsd-questions@freebsd.org References: <1440496718919-6034932.post@n5.nabble.com> <55DC3FBD.8080102@FreeBSD.org> <1440500542763-6034941.post@n5.nabble.com> <55DC53A8.3020508@FreeBSD.org> From: Matthew Seaman X-Enigmail-Draft-Status: N1110 Message-ID: <55DC55AD.9070209@FreeBSD.org> Date: Tue, 25 Aug 2015 12:46:53 +0100 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:38.0) Gecko/20100101 Thunderbird/38.2.0 MIME-Version: 1.0 In-Reply-To: <55DC53A8.3020508@FreeBSD.org> Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="RP5UOcCn3td0qbFhuSuwmC5lDBCaR3rn5" X-Virus-Scanned: clamav-milter 0.98.7 at lucid-nonsense.infracaninophile.co.uk X-Virus-Status: Clean X-Spam-Status: No, score=-2.8 required=5.0 tests=ALL_TRUSTED,AWL,BAYES_00 autolearn=ham autolearn_force=no version=3.4.1 X-Spam-Checker-Version: SpamAssassin 3.4.1 (2015-04-28) on lucid-nonsense.infracaninophile.co.uk X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 25 Aug 2015 11:47:04 -0000 This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --RP5UOcCn3td0qbFhuSuwmC5lDBCaR3rn5 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable On 2015/08/25 12:38, Matthew Seaman wrote: > On 2015/08/25 12:02, zhup wrote: >> My proposal of solution with "noatime" and "softdep" flag: >> >> # vi /etc/fstab >> /dev/sd0a / ffs rw,noatime,softdep 1 1 >> >> What to you think about it? >=20 > 'softdep' is not something FreeBSD understands. (I think it's an > OpenBSD-ism) To clarify: it's not something that FreeBSD understands in fstab(5). You can use tunefs to enable / disable soft updates on a filesystem: tunefs -n enable /dev/sd0a (unmount the FS first) However, I don't think softupdates has much effect on the /number/ or writes made to the filesystem. It's all about re-ordering writes to ensure metadata consistency. Cheers, Matthew --RP5UOcCn3td0qbFhuSuwmC5lDBCaR3rn5 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Comment: GPGTools - https://gpgtools.org iQJ8BAEBCgBmBQJV3FWtXxSAAAAAAC4AKGlzc3Vlci1mcHJAbm90YXRpb25zLm9w ZW5wZ3AuZmlmdGhob3JzZW1hbi5uZXQxOUYxNTRFQ0JGMTEyRTUwNTQ0RTNGMzAw MDUxM0YxMEUwQTlFNEU3AAoJEABRPxDgqeTn1dsP/RMEIdVuDtyKJCSC66Y2L1Mf Ti+XCGz1XZDW9Y/tyDKrJ31sS0t005erKCeGpAixpPdrEmEVj4TWuRlbOXFA5NLY C4pxu/DzgHQEqt6c8zrLXTqk2plEp79o7hc66nA4KNXdWs5C9tJSQGv/ffCecC5I XSHayEXgQPc5aHtlMf492wcjNP7SawCaMtmdV36UONDqnmAu7xMImRUFyJ2d8Cfe 7fCCgwDUQIR6LmgOF5Tf0N9kL0jeCyXSmbLHqfSeA0fRr8K/XWUevIqQY+wW4SF/ nwSoYSt4vpcx9bVgNkqESHTt8xL721eeFyLzgREJoL0eI/pqBAVvZqCJsgOzKg8t Rad16zvVFQJJ5W/dgY14sBH998sUZOeE9QJ7YGITFCzt5mivMmwCLnjTfqlp8Rpy 9RAdoKAkXgpfL415Q4LRmejmpBr75oLA6toiho1LjzREeIkfA/19PEOFfTbZHewA VkQdB+okIkOS4lC0xzWSUX6JuJzM53GzoFQDRt1UE2aRfcRK/wCW/2ECD7WYvp5h PFJissNeukHDWn+WRgiqviDmQvn0q2B5IHvMACFoFRkpDkUasm5wzjIcSk02DTGV P+WFvzcKHPAmW+eg/k1NH/Lf7tfVo44o0d+7hh59YIU1ECb5F8GcEflyNaUMT0rd emUmtdda7jI+8BrjGri7 =QBMJ -----END PGP SIGNATURE----- --RP5UOcCn3td0qbFhuSuwmC5lDBCaR3rn5--