Re: srfs - a new file system.

[Andreas Dilger <adilger@clusterfs.com>]

On Oct 24, 2003  14:52 -0600, Pat LaVarre wrote:
> "How can we know how commonly that occurs in practice, so that we can
> know how often we're wrong to believe such things as our locally
> recorded vector time?"
> 
> Is there, as yet, no linux filesystem that preserves the integrity of
> the data and metadata despite such failures?  If I could write such an
> fs on to a single directly-attached local drive, then I could measure
> how often I myself experience such failures.
> 
> I'm confident I actually do experience these failures because often I
> work in comparative, raid-like measures.  When I see one drive and
> another disagree about what I wrote, then whenever I trust my write and
> diff and read tools I must conclude one or both of the HDD's is wrong.

I recall there being a loopback driver that will write a checksum for each
block written to the device into a separate block device (probably just
another loop device on a separate filesystem) so you could use that to
verify your data on each read.

Cheers, Andreas
--
Andreas Dilger
http://sourceforge.net/projects/ext2resize/
http://www-mddsp.enel.ucalgary.ca/People/adilger/