Date: Wed, 18 Sep 1996 15:10:37 +0200 (MET DST) From: "Julian H. Stacey" <jhs@freebsd.org> To: phk@freebsd.org Cc: current@freebsd.org Subject: Re: vm in current is NOT ok yet... Message-ID: <199609181310.PAA06161@vector.jhs.no_domain> In-Reply-To: Your message of "Fri, 13 Sep 1996 19:22:22 %2B0200." <5638.842635342@critter.tfs.com>
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Hi, Reference: > From: Poul-Henning Kamp <phk@critter.tfs.com> > > 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/
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