Actually, from the early papers I read about Journalling filesystems,
their whole purpose was efficiency, with other possible features (like
audit trail) as good but ancillary features.
As I remember it, with good read-caching, you need very little disk
activity for reads, and since the journal is written sequentially to
the device, you don't have to do seeks very often on writes. One
author was claiming speedups of 2-3 orders of magnitude -- but that
was a few years ago. I can dig up the references if anyone is
interested.
mito
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