> Date: Sat, 05 May 2001 09:31:09 -0700
> From: Nick Sayer <[EMAIL PROTECTED]>
> Sender: [EMAIL PROTECTED]
>
> That may be the original intent, but cheap IDE drives let you turn on
> write caching, and they're for sure not battery-backed (nor do they
> attempt to store enough power at power-off to write back the cache with
> the remaining rotational latency or any such trickery). They lie about it.
>
> Write caching is evil unless you specifically know that it's being
> battery backed. 99.44% of the time, that's not the case.
An obvious exception is the laptop. I always turn on write cache on my
laptop as I know that it has a LONG battery backup. For a worst-case
type of operation (dd), I get 4x faster writes with write-cache
enabled on my laptop.
R. Kevin Oberman, Network Engineer
Energy Sciences Network (ESnet)
Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab)
E-mail: [EMAIL PROTECTED] Phone: +1 510 486-8634
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