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Re: RAID & Hard disk performance

On Sat, 3 Nov 2001 14:33, Jeff Waugh wrote:
> <quote who="Russell Coker">
> > RAID-5 is another issue though.  But then you have to consider that Linux
> > software RAID kills the performance of most hardware RAID controllers. 
> > Run an Athlon 800 with two IDE drives in RAID-1 and expect 2-4 times the
> > performance for bulk IO that an entry level Mylex RAID controller with
> > Ultra2 SCSI 10K rpm drives.  I expect that a top-end Mylex controller
> > will perform well (but who can afford one of them?).
> Wow!
> Russell, do you know of any Linux I/O and hard disk performance guides?
> I've recently read Adrian Likins' system tuning page [1] and am interested
> too see if there's anything more specific.

I'll have to check out that link.  But generally I rely on my own experience 
when playing with disk performance.  I haven't (yet) come across any guides 
to these things which were good and pitched at a high technical level.  
There's a number of guides that tell you about hdparm and what DMA is, but if 
you already know that stuff then there's little good documentation.

Then on the rare occasions that I do meet people who know this stuff 
reasonably well they seem to spend all their time trying to convince me that 
SCSI is better than IDE (regardless of benchmark results).  :(

> [1] http://people.redhat.com/alikins/system_tuning.html

http://www.coker.com.au/bonnie++/     Bonnie++ hard drive benchmark
http://www.coker.com.au/postal/       Postal SMTP/POP benchmark
http://www.coker.com.au/projects.html Projects I am working on
http://www.coker.com.au/~russell/     My home page

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