Date: Wed, 25 Feb 2009 01:53:10 -0800 From: Carl <k0802647@telus.net> To: Peter Jeremy <peterjeremy@optushome.com.au> Cc: freebsd-fs@freebsd.org Subject: Re: UFS2 and/or sparse file bug causing copy process to land in 'D'' state? Message-ID: <49A51506.8000708@telus.net> In-Reply-To: <20090225063219.GC31601@server.vk2pj.dyndns.org> References: <49A10626.8060705@telus.net> <alpine.BSF.2.00.0902231022520.71916@fledge.watson.org> <49A3357A.7080008@telus.net> <59adc1a0902232102q6c0f6034r354ff9ad3a2b3222@mail.gmail.com> <49A3B2FC.4050601@telus.net> <20090225063219.GC31601@server.vk2pj.dyndns.org>
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Peter Jeremy wrote:
>> The same sequence has also now been tried on a laptop, both natively and in
>> a virtual machine on top of WinXP, although both were FreeBSD 7.1 rather
>> than 7.0. Neither have failed so far.
>
> So it's possible that the bug you are hitting was fixed between 7.0
> and 7.1. Is it possible for you to upgrade to 7.1?
It is and it will happen, but not for a while yet, especially for the
remote system.
I should note that the 7.0 systems that fail are entirely different
hardware using gmirror and gjournal whereas the 7.1 laptop and VM
instances are not - rather a lot of variables changed at once.
Peter, are you aware of some specific fixes between 7.0 and 7.1 that
might explain my problem?
> At this stage, all I can suggest is that it's time for you to expand
> your knowledge :-)
Oh I am, Peter, I am. But I need a whole lot more hours in a day to add
that to the list right now :-)
Seriously though, are there some FreeBSD developers with even vaguely
similar configurations that might be interested enough to inflict the
following simple loop on their system to see if they can reproduce this?
#!/bin/csh
set count = 0
while( $count < 20 )
@ count = $count + 1
echo "truncate attempt $count..." >> /tmp/ouch.log
truncate -s 671088640 target
mdconfig -f target -S 512 -y 255 -x 63 -u 7
bsdlabel -w /dev/md7 auto
newfs -O2 -m 0 -o space /dev/md7a
mount /dev/md7a /mnt
tar -cvf - -C /usr/src . | tar -xvpof - -C /mnt
umount /mnt
mdconfig -d -u 7
rm target
end
Carl / K0802647
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