From owner-freebsd-current Wed Sep 18 13:48:46 1996 Return-Path: owner-current Received: (from root@localhost) by freefall.freebsd.org (8.7.5/8.7.3) id NAA17630 for current-outgoing; Wed, 18 Sep 1996 13:48:46 -0700 (PDT) Received: from vector.jhs.no_domain (slip139-92-42-167.ut.nl.ibm.net [139.92.42.167]) by freefall.freebsd.org (8.7.5/8.7.3) with ESMTP id NAA17322; Wed, 18 Sep 1996 13:47:52 -0700 (PDT) Received: (from jhs@localhost) by vector.jhs.no_domain (8.7.5/8.6.9) id PAA06161; Wed, 18 Sep 1996 15:10:37 +0200 (MET DST) Date: Wed, 18 Sep 1996 15:10:37 +0200 (MET DST) Message-Id: <199609181310.PAA06161@vector.jhs.no_domain> To: phk@freebsd.org Cc: current@freebsd.org Subject: Re: vm in current is NOT ok yet... From: "Julian H. Stacey" Reply-to: "Julian H. Stacey" Organization: Vector Systems Ltd. Mailer: EXMH 1.6.7, PGP available X-address: Holz Strasse 27d, 80469 Munich, Germany X-phone: +49.89.268616 X-fax: +49.89.2608126 X-web: http://www.freebsd.org/~jhs/ In-reply-to: Your message of "Fri, 13 Sep 1996 19:22:22 +0200." <5638.842635342@critter.tfs.com> Sender: owner-current@freebsd.org X-Loop: FreeBSD.org Precedence: bulk Hi, Reference: > From: Poul-Henning Kamp > > I just ran a md5 on a 45 mbyte file three times and received 3 > different answers... Just in case ... If you want to exercise your file system (& supporting disc driver) (to be sure it's vn & not a drive becoming ill ), I wrote a program that writes & reads a test pattern file of arbitrary (ie very large) size. It's called Testblock (.c & man). http://www.freebsd.org/~jhs/src/bsd/jhs/bin/public/testblock/ A few of us got nasty unwelcome suprises about supposedly OK drives, after checking with testblock.c, so if you want to be absolutely sure about your drive data reliability, try testblock (runs safely in user mode on file systems, no root or raw devices needed), while simultaneously keeping same disc & other scsi devs busy with other tasks (That's how I got my old supposedly good HP drive to choke & garble data, didnt seem to garble (so much) when less busy). Julian --- Julian H. Stacey jhs@freebsd.org http://www.freebsd.org/~jhs/