Messages in this thread | | | Subject | Re: SCSI write caching (was: Dumb question: Which is "better" SCSI or IDE disks?) | Date | Wed, 09 Dec 1998 12:20:18 -0500 | From | C S Hendrix <> |
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In message <5ln24ye208.fsf@tequila.cs.yale.edu>, Stefan Monnier writes:
> >>>>> "Christopher" == Christopher Smith <cbsmith@envise.com> writes: > > In general, I'd say, unless you know you need write caching disabled, you > > probably should have it enabled. > > Beside the `is it safe', I believe the main question is: > how much performance improvement can I expect (this will of course depend on > the load, but then I'd like to know about that too) ?
Last night I ran some tests with bonnie.c on my system with a DPT 2044 controller and two Seagate Hawk fast-wide drives.
The tests were actually faster with write cache turned off. I'm not sure I really expected it to be faster, but I was surprised that cache slowed things down.
I'm talking too about a fairly significant different of nearly 2MB/sec on the block output test.
Granted, bonnie and other benchmarks are not the best, but I think it is safe to at least say write-cache enabled was slower.
-- Shannon - shendrix@widomaker.com - InfiNet? ---------------------------------------------------------------------- "We are all of us in the gutter, some of us looking at the stars." -- Alexander Pope
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