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SubjectRe: Disk hardware caching, performance, and journalling
On Sat, Nov 24, 2001 at 11:08:17AM -0800, Andrew Morton wrote:

In theory, yes. In my opinion, no. For ext3, at least. Caching
isn't bad per-se. It's reordering which can break the journalling
constraints.

Some disks[1] most definately do reorder; I've actually been able to
demonstrate this in some circumstances (it wasn't trivial to
produce and required several attempts).



--cw

[1] SCSI, which we know does and will reorder writes when a barrier
isn't specificed, it appears IDE drives can do the same but lack of
hot-swap makes testing tedious :)
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