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Re: problem using ext3 on root fs

Thanks for your quick response, Juri!

However, I'm not quite satisfied with your explanation. First of
all, I did declare the root fs as being of type ext3 in my
/etc/fstab (should of course have mentioned that), like so:

/dev/discs/disc0/part1	/		ext3	rw,noauto	0 1

And as to disabling periodic checks using the '-c' or '-i' options
to tune2fs, here's a qoute from the man page:

  You  should  strongly  consider  the  consequences  of  disabling
  mount-count-dependent  checking entirely.  Bad disk drives, cables,
  memory, and kernel bugs could all corrupt a filesystem without
  marking the filesystem dirty or in error. If you are using journaling
  on  your  filesystem,  your filesystem  will  never  be  marked dirty,
  so it will not normally be checked.  A filesystem error detected by
  the kernel will still force an fsck on the next reboot, but it may
  already be too late to prevent data loss at that point.

If I do not get this wrong, it means that no checks will be performed
just because the maximum mount count has been exceeded, if jounaling
is in effect. So this contradicts your explanation, or doesn't it?


On Tuesday, 3. December 2002 23:45, Juri Haberland wrote:
> Thomas Koeller wrote:
> > Hi,
> Hi,
> > I just converted all my hard disk filesystems from ext2 to ext3.
> > This worked perfectly fine for all non-root fs, but I am having
> > trouble converting the root fs, too. Here's what I did:
> >
> > 3. Added 'rootfstype=ext3' to the kernel arguments in lilo.conf
> >    and of course ran lilo.
> AFAIK you don't need this. If ext3 is build into the kernel it should try
> ext3 before ext2.
> > Kernel command line: auto BOOT_IMAGE=normal ro root=301 rootfstype=ext3 1
> > <lines deleted>
> > kjournald starting.  Commit interval 5 seconds
> > EXT3-fs: mounted filesystem with ordered data mode.
> > VFS: Mounted root (ext3 filesystem) readonly.
> >
> > which seems to indicate that the fs is actually recognized as
> > ext3.
> Yup.
> > In my startup script, I later invoke e2fsck on the root fs
> > before re-mounting it with r/w access. At this point, e2fsck tells
> > me that the maximum mount count has been exceeded and checks the
> > file system, which should not happen with journalling in effect.
> Sure, it should happen. If you don't want that use 'tune2fs -c0' or
> 'tune2fs -i0' to alter/disable this.
> > Then, after the system has been fully booted, I issue a 'mount' command
> > and get:
> >
> > ~ $ mount
> > /dev/discs/disc0/part1 on / type ext2 (rw)
> >
> > So, while all my non-root file systems are correctly recognized as
> > ext3, the root fs appears to be mounte as ext2. The contents of
> > /proc/mounts, however, look differently:
> >
> > ~ $ cat /proc/mounts
> > rootfs / rootfs rw 0 0
> > Is anybody able to explain those apparent inconsistencies?
> This is perfectly normal. /proc/mounts is authorativ.
> I assume you still have declared your rootfs as ext2 in your /etc/fstab.
> Change that and /etc/mtab (where mount gets its information from) will be
> correct after the next boot (Uh, oh, I can't remember the exact
> dependencies between rootfs, mount and /etc/mtab - List to the rescue).
> Regards,
> Juri
> _______________________________________________
> Ext3-users mailing list
> Ext3-users redhat com
> https://listman.redhat.com/mailman/listinfo/ext3-users

Thomas Koeller
thomas koeller dyndns org

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