Re: Logging disk accesses.

Etienne Lorrain (lorrain@fb.sony.de)
Wed, 3 Jun 1998 12:12:00 +0001

> > It is not fool prof but it is then a userland daemon - and may worth to
> > be tried... Another solution is to backup the complete disk, clear it,
> > and restore every files - but in a special order.
>
> Actually sct's e2defrag will do this, defrag files and you're allowed to
> specify an order.
>
> In practice, I don't notice any benefit from defrag drives as opposed to
> ones I use normally (unless I try to fragment them deliberately).

Looking things from the hardware point of view, it should be
quicker to keep heads at the same place... Maybe ext2 filesystem
(with its superblocks spread out the whole disk) keeps heads
moving - so reduce (average) performance to increase safety
(crash recovery).

Is there someone who had enough time to try "benchmarking" the
different filesystems supported - and say which one is better
for performance, which one is better for responsiveness, which
one is better for safety ? Probably the latter is ext2, at least
I have successfully tested its crash recovery some times !

Thanks,
Etienne.
----------- etienne.lorrain@ibm.net
-- hdc: irq timeout: status=0xd0 { Busy }
-- ide1: reset: success
----------> I like Linux !

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