Re: Benchmarks: Linux Kernel RAID vs a Hardware RAID setup

["Keld Jørn Simonsen" <keld@dkuug.dk>]

On Wed, Jul 16, 2008 at 05:18:46PM +1200, Richard Scobie wrote:
> Keld Jørn Simonsen wrote:
> 
> >My understanding tho, is that the IO output and input figures are on
> >sequential IO. There are no figures on random IO,
> 
> If you look at some results Justin posted:
> 
> http://home.comcast.net/~jpiszcz/20080707/veliciraptors_with_x4.html
> 
> The column "Random Create" shows performance for randomly creating, 
> reading and deleting 16384 files sized between 16bytes and 1MB 
> distributed randomly through 64 directories (this is the -n parameter 
> and is shown in the "Num Files" column.)

Yes, but these are not random IO in the sense that I meant it, which was
unclear. These are specific system calls, delete, and seeks, with some IO 
on the inodes and maybe releasing blocks to the empty block list.

I meant to say: There are no tests in bonnie++ that measures random
read and write thruput.

best regards
keld
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