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

> > > better. Decent write caching on IDE devices (like the 2meg buffer on the IBM)
> > > can completely hide this issue.
> >
> > Decent write caching on IDE devices can eat your whole file system.
> YM bad write caching 8)

Well, drives do reorder their cache flushes, otherwise, they don't need
the cache.

> > 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].
> You can't turn it off and on many drives you can't flush the cache either
> the operation is not implemented.

Those drives should be blacklisted and rejected as soon as someone tries
to mount those pieces rw. Either the drive can make guarantees when a
write to permanent storage has COMPLETED (either by switching off the
cache or by a flush operation) or it belongs ripped out of the boxes and
stuffed down the throat of the idiot who built it.

Matthias Andree

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