[3622] in SIPB_Linux_Development
Re: IMPORTANT: Read this or your kludgey-installed machine will wedge when it next reboots!
daemon@ATHENA.MIT.EDU (Derek Atkins)
Wed Jan 23 23:31:41 2002
To: Alex Coventry <alex_c@MIT.EDU>
Cc: kludgey-linux-testers@MIT.EDU, linux-dev@MIT.EDU
From: Derek Atkins <warlord@MIT.EDU>
Date: 23 Jan 2002 23:31:36 -0500
In-Reply-To: <200201240421.XAA32724@opus.mit.edu>
Message-ID: <sjm3d0wz7x3.fsf@kikki.mit.edu>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Ok, I know I should know this, but I've read the man page and any
online help and I can't figure out what this command is actually
going to do. What does 'tune2fs -j' do? Neither the man page
nor "tune2fs --help" mentions a -j option.
Inquiring minds want to know...
-derek
Alex Coventry <alex_c@MIT.EDU> writes:
> Hi, everyone. I hope the kludgey installer has been working smoothly
> for you. Unfortunately, the latest update to Athena breaks it. If you
> haven't noticed any problems with it yet, please run the following
> command as root NOW:
>
> /sbin/tune2fs -j /dev/hdaX
>
> where you should replace X with the number of your root partition. You
> can determine X from the output of the "mount" command. For instance,
> when I run "mount" on my system, I get the output
>
> athena$ mount
> /dev/hda1 on / type ext3 (rw)
> none on /proc type proc (rw)
> usbdevfs on /proc/bus/usb type usbdevfs (rw)
> /dev/hda6 on /usr/vice/cache type ext2 (rw)
> none on /dev/pts type devpts (rw,gid=5,mode=620)
> AFS on /afs type afs (rw)
>
> ...and the line of output that has a "/" by itself says that the root
> partition is on /dev/hda1. Thus I used the command "/sbin/tune2fs -j
> /dev/hda1".
>
> If your machine has fallen to this problem, it will halt during boot
> after announcing a kernel panic. If that's the case, let me know, and
> I'll arrange assistance for you. If you feel like having a go at this
> yourself, follow the instructions at the end of this email.
>
> My apologies for this error. In future, to prevent such an
> incompatibility from wedging your machines, I'll try to test athena
> updates on a kludgey-installed machine before they are widely released.
>
> Alex.
>
>
> How to fix a wedged kludgey machine:
>
> Your main problem is going to be getting a shell from which you can run
> the "tune2fs" command above. One way to do this is to boot from the
> rescue disk you made during installation. At the "boot:" prompt, enter
> "linux init=/bin/sh".
>
> If you didn't make/can't find a rescue disk, you can use the disk image
> in /mit/linux/rh-7.1/rescue.img. To create one, stick a blank floppy in
> a linux-athena machine, add the linux locker and run
>
> "dd bs=18k if=/mit/linux/rh-7.1/rescue.img of=/dev/fd0"
>
> If you're not using a floppy made during installation, you'll need an
> extra boot option: use "linux root=/dev/hdaX init=/bin/sh", where X is
> the partition number I was talking about above. Since you won't have a
> shell yet, you won't be able to use the "mount" command to determine X
> in this case; instead you'll just have to iterate through the possible
> values until you boot successfully. In unsuccessful cases, the boot
> process will end with a kernel panic after the complaint "Warning:
> unable to open initial console". In a successful case, you'll get a
> shell prompt.
>
> Once you have a shell prompt, you'll have to remount the root partition
> so that it's writeable. Use the following command:
>
> mount -o remount -o rw /dev/hdaX
>
> replacing with the number of your root partition in the usual way.
>
> Finally, run the tune2fs command:
>
> /sbin/tune2fs -j /dev/hdaX
>
> and reboot, and you should be all set.
>
> Good luck!
--
Derek Atkins, SB '93 MIT EE, SM '95 MIT Media Laboratory
Member, MIT Student Information Processing Board (SIPB)
URL: http://web.mit.edu/warlord/ PP-ASEL-IA N1NWH
warlord@MIT.EDU PGP key available
