From owner-freebsd-stable@FreeBSD.ORG Sat Oct 25 11:38:48 2014 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id BF209D59 for ; Sat, 25 Oct 2014 11:38:48 +0000 (UTC) Received: from albert.catwhisker.org (mx.catwhisker.org [198.144.209.73]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 7D36F9ED for ; Sat, 25 Oct 2014 11:38:47 +0000 (UTC) Received: from albert.catwhisker.org (localhost [127.0.0.1]) by albert.catwhisker.org (8.14.9/8.14.9) with ESMTP id s9PBckKK048912; Sat, 25 Oct 2014 04:38:46 -0700 (PDT) (envelope-from david@albert.catwhisker.org) Received: (from david@localhost) by albert.catwhisker.org (8.14.9/8.14.9/Submit) id s9PBcki6048911; Sat, 25 Oct 2014 04:38:46 -0700 (PDT) (envelope-from david) Date: Sat, 25 Oct 2014 04:38:46 -0700 From: David Wolfskill To: Alban Hertroys Subject: Re: Dump time issues Message-ID: <20141025113846.GY1235@albert.catwhisker.org> Mail-Followup-To: David Wolfskill , Alban Hertroys , freebsd-stable References: <6978A7BF-3CB7-4088-904D-5A60D755A04C@gmail.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="CmyYfwfsVa1xvDOW" Content-Disposition: inline In-Reply-To: <6978A7BF-3CB7-4088-904D-5A60D755A04C@gmail.com> User-Agent: Mutt/1.5.23 (2014-03-12) Cc: freebsd-stable X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 25 Oct 2014 11:38:48 -0000 --CmyYfwfsVa1xvDOW Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Sat, Oct 25, 2014 at 01:26:43PM +0200, Alban Hertroys wrote: > I?m seeing something odd in my dump output that I didn?t notice before: >=20 > Dumping /root... > DUMP: WARNING: should use -L when dumping live read-write filesystems! (That, by the way, is pretty good advice in my experience.) > ... > DUMP: dumping (Pass IV) [regular files] > DUMP: 2.43% done, finished in 3:20 at Sat Oct 25 16:09:41 2014 > DUMP: 5.35% done, finished in 2:57 at Sat Oct 25 15:51:18 2014 > DUMP: 6.98% done, finished in 3:19 at Sat Oct 25 16:19:11 2014 > DUMP: 9.14% done, finished in 3:18 at Sat Oct 25 16:22:57 2014 > DUMP: 11.98% done, finished in 3:03 at Sat Oct 25 16:12:54 2014 > DUMP: 14.35% done, finished in 2:59 at Sat Oct 25 16:13:20 2014 >=20 > Note that the time is jumping back and forth and that these times are sev= eral hours into the future: >=20 > $> date > Sat Oct 25 13:16:05 CEST 2014 > .... Sure; they are estimates. They are issued every 5 minutes or so; the first is an estimate that the dump will take 3.33 hrs. (3:20) more time, and thus complete at 16:09:41. The second (5 minutes later) estimates that it will only take 2:57 more, and thus complete at 15:51:18; this pattern continues. dump(8) tends to require varying amounts of time to process a file system, depending on the population of files where it is working -- e.g., lots of tiny files, vs. a smaller number of large files; file where all the data blocks are "near" each other, vs. those where blocks are scattered all over the file system. It is thus normal for the estimates -- especially the earlier ones -- to vary considerably. Peace, david --=20 David H. Wolfskill david@catwhisker.org Taliban: Evil cowards with guns afraid of truth from a 14-year old girl. See http://www.catwhisker.org/~david/publickey.gpg for my public key. --CmyYfwfsVa1xvDOW Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQJ8BAEBCgBmBQJUS4vFXxSAAAAAAC4AKGlzc3Vlci1mcHJAbm90YXRpb25zLm9w ZW5wZ3AuZmlmdGhob3JzZW1hbi5uZXQ4RThEMDY4QTIxMjc1MDZFRDIzODYzRTc4 QTY3RjlDOERFRjQxOTNCAAoJEIpn+cje9Bk7uhAQAITdK5M65+vWnCNn9jkjX17C D5BlfcK1YRP3kYioPbz25RNj9jPgHzz/KhVHBzeGNF5hPD38hrlIK5u7Z1WO/0Zt 8nOOForkwJLHpNZRBwnU86+WvCFoLJllwUnCPuqaAgnP7D0ivm4Qz2PSmCs8tWv8 KFwqrO5isW5qgyQd5wjrurnFGSr3MYfUmEnoug0eVcpv3DzDjDiqzE21l2gGj1UD OHGVvxLrFsEbDrCISZpUHDM98aoIo21HnbwF9bzgmA/iTZDEQoe2y1DByaNByobe k/PCX+EQgb32Lbnc1RRGbJW5ZHj3pQnh2/x49noEcJ0ZJ0VomZd2uGvpbTg3r49z 64Tqfk9hFDoHytYEozKjfXo9rMvc3MPpuqTxndn/MSAxBnsumXf1IXPCTYXBLVK9 az+wPHPAID2Nbh26wfb8sSbYRJRBAoMA6eaWAzXziba79hty10rusL2Q88rACTwP N2iawkpAy1uaHDjQthjTT6d5ZrnVwEhZ+EhDMCo7aPHoSATc/297QytuVrgEAEly n8fwheFTT9iZ6FmuUBAQMOtJZ6TJ4qtw18mUE4kZZjpVB5I7fpR1YQOCCuIr7wXL pxLMnSlR+mgOcO+Tp5ustD+mTW5h7NbTYMu6zRZ1Rd7qaEhB1Z4Ey4Gxtjv7PxXZ 5h6+Hu2Oone0cRKKcCta =3W2h -----END PGP SIGNATURE----- --CmyYfwfsVa1xvDOW--