On Sat, Apr 24, 2004 at 11:01:33AM +0100, Niall O Broin wrote:
> BTW I find this rather interesting - here's Frank with a journalling
> filesystem which suffered an unplanned poweroff, one of the things with
> which a jfs should cope better than a non jfs - but it didn't. Of
> course, perhaps the damage would have been much worse without a jfs.
Journalling protects you very well against you hitting the reset button
or crashing the kernel. In these cases, the disk still has power and
makes sure that the data just written by the kernel hits the platters.
When you pull power, it becomes a race between the CPU, disk electronics
and disk motor. Writes that got to the disk might not make it from the
disk's on-board cache to the platters.
Later,
Kenn
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