On Wed, 1 Oct 2003, Andrew Sullivan wrote:

> On Wed, Sep 17, 2003 at 04:46:00PM -0400, Michael Adler wrote:
> > So the quesiton is whether it is ever sensible to use write-caching and
> > expect comparable persistence.
> Yes.  If and only if you have a battery-backed cache.  I know of no
> IDE drives that have that, but there's nothing about the spec which
> makes it impossible.

FYI, on a Dual PIV2800 with 2 gig ram and a single UDMA 80 gig hard drive, 
I from 420 tps to 22 tps when I disable write caching.  WOW.  A factor of 
about 20 times slower.  (pgbench -c 4 -t 100)

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