Re: ..fixing ext3 fs going read-only, was : Sendmail or Qmail ? ..
On Mon, 8 Sep 2003 00:20:12 +1000,
Russell Coker <email@example.com> wrote in message
> 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.