J Chapman Flack wrote:

>>Performance is a bonus, i think the safety alone is worth it.

> Hmm, is this right?

Ok, here are some scenarios:

:(  = may be broken, worst thing: even a manual fsck can't repair it
:)  = should be ok, worst thing: some inclaimed inodes/blocks

              softdep, writebackcache on | no softdep, writebackcache on
-----------------------------------------+------------------------------
powerfailure            :(               |           :(
reset                   :)               |           :(
kernel panic            :)               |           :(


The filesystem with softdep wins if writeback cache is on (wich is default).

See http://www.mckusick.com/softdep/ (softdep) and
http://sr5tech.com/write_back_cache_experiments.htm (writeback cache).

Karsten

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