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Re: Electricity Cutoffs, EXT3 and Filesystems

On Mon, 03 Nov 2008, Robert E A Harvey <bobharvey@europe.com> writes:
> I used to operate a whole bunch of Solaris systems on survey ships,
> and power-loss situations were always fraught.
> My thoughts: ReiserFS is still available and stable, why not use it
> for a year and see what happens?

Actually, I'm inclined going in that direction too. In Turkish we have a
saying: "While wise one looks around for a bridge, mad on gets across
the river by swimming."

> My other thought: Hardly a recommendation, because I have not tried
> it, but have you looked at http://jfs.sourceforge.net/?  You could put
> it on an old box and pull the power cord half a dozen times to see
> what happens

After all, JFS also does meta-data journaling. I don't think it'll bring
much more features than ReiserFS, except a so called community support.

> Passing thought: I've worked with instruments that use real-time
> linux, and most of those had a crash-proof file system of one sort or
> another.  A bit of research into what they use might be good.  I do
> know that Arcom use what they call "Compressed Journalling Flash File
> System (JFFS2)", but there are larger real-time systems with hard
> disks.  One data acquisition system I used just used ext3 but mounted
> nosync.  It didn't cause much trouble.

I've neither used, nor heard anyone using a JFFS[2] on a production
server, except embedded devices. Any experiences?

> It is the obvious solution: rig the serial output from the UPS to
> trigger a shutdown immediately.
> It is possible  hough that the UPS may not be large enough to provide
> the amps required for all those servers during normal operation.  I too
> have worked in Banana republics and on ships where the UPS is more
> trouble than it is worth.



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