On Wed, Jan 26, 2005 at 03:53:46PM -0700, Terry R. Friedrichsen wrote: > I wrote: > > >> try running something that works the file system and simply turn off the > >> system power in the middle of it. > > to which [EMAIL PROTECTED] replied: > > > This is expected if you don't turn off write caching of the hard > > disks. It breaks the softupdates consistency model because data > > written to the disk may not actually be written to the disk, so it's > > not there following an unexpected power cycle. Unfortunately write > > caching causes a performance hit, and there was a large user backlash > > when it was briefly enabled by default some years ago. > > What you say is true, but what I'm observing is far worse than simply > missing the last few blocks of output files, etc. > > The last time I had to power-cycle the Alpha box (because Xorg hung it), > it rebooted to single-user mode but I couldn't even run "sh" because > some file in lib was missing. Or if I *do* get into "sh" to run fsck, > it finds *hundreds and hundreds* of problems ...
Some disks are also known to go crazy and scribble everywhere when they lose power. Kris
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