Okay, this is so not cool..

James Bourne jbourne at mtroyal.ca
Fri Oct 17 08:27:01 CDT 2003

On Thu, 16 Oct 2003, Tony Gale wrote:

> On Thu, 2003-10-16 at 15:00, James Bourne wrote:
> > 
> > Hi,
> > I think one thing you might not fulfill  in the "quest to break the box"
> > is that the systems crash under heavy write I/O.  You can actually
> > help the situation by shutting off write caching in the controller, though
> > you can still make the system crash, it just doesn't crash as often.
> > 
> Ok, thats a fair point. Now, what do you consider a heavy write I/O. Is
> this script adequate, whilst continuing normal webserving?

At first I was using bonnie++ to do it, now I'm trying iozone as
it's supposed to work better...

In the past 8 hours using iozone, I've managed to get a scsi timeout on a
system which for the past 2 weeks I hadn't received one using bonnie++
or dd.  It seems iozone really pushes the I/O, and it's really
configurable if you need that.

James Bourne

James Bourne, Supervisor Data Centre Operations
Mount Royal College, Calgary, AB, CA

"There are only 10 types of people in this world: those who
understand binary and those who don't."


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