Re: Electricity Cutoffs, EXT3 and Filesystems
On Mon, 03 Nov 2008, Robert E A Harvey <email@example.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 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.