Re: New filesystem for Linux

[Phillip Susi]

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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