Messages in this thread | | | Subject | Re: Dumb question: Which is "better" SCSI or IDE disks? | Date | Mon, 07 Dec 1998 14:13:02 -0500 | From | C S Hendrix <> |
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In message <Pine.LNX.4.04.9812070215060.3437-100000@localhost>, Christopher Smi th writes:
> This is just a case of silly benchmarking. Do you really believe that IDE > is 4x faster than SCSI? All those big server vendors must be idiots eh?
This is the one point that should settle the argument, but seems to have no effect.
> Well, based on this, your IDE drive is so fast it ever outperforms RAM! > ;-) (You are copying ~9 MB through a controller with 32 MB of cache.) My > suspicion is that your DPT RAID-1 controller with 32 MB cache is setup > with write caching disabled, as is the case for your SCSI hard disks. This > is one area where SCSI performance typically lags behind that of IDE, > because SCSI hard disk vendors typically setup their caches to not do > write caching by default (this can typically be changed, however). This is
I noticed this was an option with the scsi tools under Linux, and I was wondering if it was prudent for me to turn on write cache on my drives. All of them support the option.
> Based on the information you've provided, it seems apparent that you are > testing with 2 different drives. Of course, you are also comparing two > entirely different OS's (ok, they're both Unixes, but SCO Open server is a > pig, and we all know it). On top of that you're dealing with two totally > different filesystems. I wonder if you are even using the same hardware > (CPU/memory/etc). What exactly do you think this benchmark proves?
My DPT based system (Seagate Hawks, fast-wide) did the test in 0.65 seconds. Big hairy deal. I have no idea when the data actually made it to the disk. The same test test was 1.5 seconds to my very slow IDE Zip drive... :)
-- 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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