> Something that none of us mentioned WRT write barriers is that while the > filesystem structure may avoid corruption when the power is cut, files > may still be corrupted, in conditions such as any/all of these: > > 1. unwritten data still in buffer cache > 2. drive caches are enabled > 3. BBWC not working properly > > If the techs are determined to hard cut power because they don't have > the time or the knowledge to do a clean shutdown, it may be well worth > your time/effort to write a script and teach the field techs to execute > it, before flipping the master switch. Your simple script would run as > root, or you'd need to do some sudo foo within, and would contain > something like: > > #! /bin/sh > sync > echo 2 > /proc/sys/vm/drop_caches > echo "Ready for power down." > > This will flush pending writes in buffer cache to disk, and assumes of > course that drive caches are disabled, and/or that BBWC, if present, is > functioning properly. It also assumes no applications are still > actively writing files, in which case you're screwed regardless. It's > not a perfect solution and there's no guarantee you won't suffer file > corruption, but this greatly increases your odds against it. Thank you, that's the plan indeed. Educating our customer, and minimize failure with such script / recommendation. _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
