On Thu, Jul 15, 2010 at 10:20:22PM +0200, Florian Weimer wrote:

> It's a generic Linux problem, not an ext3-specific issue.  Until
> recently, the Linux block layer had no concept of a sync operation.
> Linux basically assumed that all writes were synchronous and ordered,
> which they are not if your hardware has (non-transparent) write
> caches.  It did not disable write caching by default, either.

For quite some time, ext3 in mainline and most distro's defaulted to
nobarrier (barrier=0) --- the only exception to this I'm aware of was
SLES.

Mainline switched to having barriers on by default, I assume the
distro's have or will follow.

Some other filesystems (XFS for example) have had barriers enabled by
default.
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