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SubjectRe: writing file to disk: not as easy as it looks
> > There are certainly things you can do.  Put your fileservers's on
> > UPS's. Use RAID. Make backups. Do all three. :-)
>
> Okay, so we pretty much know that ext3 journalling helps in "user hit
> the reset button" case. (And we are pretty sure ext2/ext3 works in
> "clean unmount" case). Otherwise
>
> *) kernel bug -> journalling does not help.
>
> *) sudden powerfail -> journalling helps works on SGI high-end
> hardware. It may or may not help on PC-class hardware.
>
> We already do periodic checks, even on ext3. Maybe we should do fsck
> more often if we see evidence of unclean shutdowns (because we know
> PC hardware is crap...).

What we might need is on-line fsck. E.g. fsck while the fs is still
mounted.

Might be tricky to implement.



Folkert van Heusden

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