From owner-freebsd-hackers  Wed Mar 31 16:25:47 1999
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From: Darren Reed <avalon@coombs.anu.edu.au>
Message-Id: <199904010023.KAA28528@cheops.anu.edu.au>
Subject: Re: another ufs panic..
To: dillon@apollo.backplane.com (Matthew Dillon)
Date: Thu, 1 Apr 1999 10:23:38 +1000 (EST)
Cc: avalon@coombs.anu.edu.au, mladavac@metropolitan.at, rb@gid.co.uk,
	wilko@yedi.iaf.nl, jkh@zippy.cdrom.com, hackers@FreeBSD.ORG
In-Reply-To: <199903311710.JAA49644@apollo.backplane.com> from "Matthew Dillon" at Mar 31, 99 09:10:26 am
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In some mail from Matthew Dillon, sie said:
> 
> :Well....
> :first run, no tar on EIDE drive (just two drives now, EIDE & SCSI,
> :nothing else powered, which has ended up with corrupt dirs):
> :
> :gawaine /usr# dd if=/dev/zero bs=16384k of=/dev/rsd0s4
> :dd: /dev/rsd0s4: short write on character device
> :dd: /dev/rsd0s4: end of device
> :125+0 records in
> :124+1 records out
> :2089221120 bytes transferred in 248.516462 secs (8406772 bytes/sec)
> :
> :Now the interesting part!
> :
> :I wrote my own program to read it back and check that all that was read
> :was indeed null bytes...however!
> :
> :>From 874627584 (0x3421c200 - 0x3421cfff) was non-null (actually garbage,
> :not just 0x01 or 0x02 or 0xf0, etc).  About 3572 bytes worth.
> :
> :Wanting to confirm the location, I ran it again...this time 95573 bytes.
> 
>     What release of the os ?
> 

This was 2.2.8-RELEASE.

However, I duplicated the above problem with Solaris7.

Disabling "Ultra" speed in the BIOS controller has done a lot to
resolve this, however.

Darren


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