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Re: ..fixing ext3 fs going read-only, was : Sendmail or Qmail ? ..



On Mon, 8 Sep 2003 00:20:12 +1000, 
Russell Coker <russell@coker.com.au> wrote in message 
<200309080020.12634.russell@coker.com.au>:

> On Mon, 8 Sep 2003 00:17, Arnt Karlsen wrote:
> > ..I have had a few cases of ext3fs'es, even on raid-1, going
> > read-only on errors, what do you guys use to bring them back
> > into service?
> 
> What happens on error conditions can be set through tune2fs or as a
> mount option.  Having it remount read-only is probably better than
> panicing the kernel.

..yeah, except in /var/log, /var/spool et al, I also lean towards 
panic in /home.

> When it happens a reboot may be a good idea, in which case a fsck to
> fix the problem should occur automatically.

..should, agrrrRRRRRRRrrreed.  IME (RH73 - RH9 and woody) it does not.

..what happens is the journaling dies, leaving a good fs intact, 
on rebooting, the dead journal will "repair" the fs wiping good 
data off the fs.

..compare 'df -h' and 'cat /proc/mounts' on such a system.

..the errors=remount,ro fstab option remounts the fs ro but fails 
to tell the system, so the system merrily "logs" data and "accepts" 
mail etc 'till Dooms Day, and especially on raid-1 disks I sort of 
expected redundancy, like in "autofeather the bad prop and trim out 
the yaw" and "autopatch that holed fuel tank", and "auto-sync the 
props", I mean, this was done _60_years_ ago in aviation to help 
win WWII, and ext3 on raid-1 floats around USS Yorktown-style???

-- 
..med vennlig hilsen = with Kind Regards from Arnt... ;-)
...with a number of polar bear hunters in his ancestry...
  Scenarios always come in sets of three: 
  best case, worst case, and just in case.



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