[rescue] Sun 711

[George Adkins]

> > Is this unsound for figuring raw read performance?
>
> Actually it can be depending on the composition of the file. <snip>

This one was mpeg video, but it was not compressed.

> And that the transfer last
> long enough. Anything liess than 10 seconds is insufficient, and personally
> I go for a minute. Also you need to make sure that the file is large than
> the combined system RAM, controller, and hard drive cahce if you want to
> see the true sustained throughput to the spindles rather than cache
> throughput

this was a 1 gig file, and it took just longer than 10 seconds.  To get 1 
full minute, I's probably have to cat together 8 or 9 gigs of file.  The 
system has 1 gig of RAM and the controller has 32 Megs of cache, but I don't 
see how that would falsely affect this test since it's straight read 
performance (no write caching).

>
> I was also assuming write throughput for my calculations not read
> theroughput. Read throughput can often reach over 90% of maximum if you are
> reading from a (or a set of) non striped non parity mirror.
>
Yes, but the requirements he was asking for was pure read performance speed 
as well...

> I hihgly recommend IOZone and Bonnie. <snip>
>
I looked at Bonnie, it looks interesting.  Tests several performance aspects, 
it's small, comes in source code, is non-proprietary, etc.  I would not be 
using IOZone (Don't do Winders...).

Thanks for the info.

George