Raymond Kelly asked
> Just a quick question from the ignorant ..
> What is the difference between a Journaling & non-journaling FS
Anywhere from two minutes to an hour depending on the size of your filesystem :-)
Oh, ok, as you're ignorant . . . .
A journalling filesystem logs (or rather journals) all changes to the filesystem
in a special file. The advantage of this is that when it's necessary to fsck the
filesystem e.g. after an unclean shutdown due to a power outage the journal makes
this very much faster. I have a 16GB ext2fs filesystem which takes >10 minutes to
fsck after an unclean shutdown. In fairness, it doesn't happen very often, but it's
a pain in the neck when it does.
Now don't anybody please bitch about the above - it's a 5 line precis for the ignorant.
I know about journalling all data / only metadata etc. - I've Tweedie's paper on the
desk beside me and I've read Reiser's stuff, and there's whatever's coming from SGI.
Kindest regards,
Niall O Broin
UNIX Network Administrator nobroin at esoc.esa.de
Ground Systems Engineering Department Ph./Fax +49 6151 90 3619/2179
European Space Operations Centre, Darmstadt, Germany
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