Mikulas Patocka wrote:
There was discussion about it here some times ago, and I think the
result was that the IDE bus is reset prior to capacitors discharge and
total loss of power and disk has enough time to finish a sector --- but
if you have crap power supply (doesn't signal power loss), crap
motherboard (doesn't reset bus) or crap disk (doesn't respond to reset),
it can fail.
BTW. reiserfs and xfs depend on this feature too. ext3 is the only one
that doesn't.
Mikulas
Yes, if your disk can not atomically commit a single sector, then it is
broken. And ALL filesystems rely on this behavior because they all
expect NOT to have hardware IO read failures of important metadata after
a power failure ( due to the sector ECC failing ).
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