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SubjectRe: [PATCH] 2.4.10 improved reiserfs a lot, but could still be better
On Mon, 24 Sep 2001, Nicholas Knight wrote:

> > Turn it off (I have no idea of internals, but I presume it'll still
> > be a write-through cache, so reading back will still be served from
> > the buffer). Do hdparm -W0 /dev/hd[a-h].
> I'm sorry, but that's not acceptable.
> Please note the dd timings at the bottom of this message.

Well, of course, turning off the cache will cause performance penalties,
but it at least gives you a chance to get away with a recoverable file
system should the power fail or the box crash.

> Yes, a typical desktop user isn't going to notice much, even a normal
> webserver or fileserver not dealing with constant updates may not, but
> certain workloads will. These workloads are real enough that telling
> people to disable write caching out of hand is a bad idea.

I switched a box to ext3 with write caches off in expectance of multiple
power outages during works, and NOTHING happened. I expect that box is
now writing 4 times slower than before, I have no real figures, and it's
still "smooth enough" in spite of 2.4.9.

> Keep in mind also, that you may be putting your data and filesystems in
> more risk by not using a write cache as with using it.

Utterly non-sense.

Linear writing as dd mostly does is BTW something which should never be
affected by write caches.

Matthias Andree

"Those who give up essential liberties for temporary safety deserve
neither liberty nor safety." - Benjamin Franklin
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