Which is faster: iSCSI to linux box over 1Gb or local SATA storage with intel ICH9?

Andy Smith andy at strugglers.net
Sun May 16 14:23:17 BST 2010


Hello,

On Sun, May 16, 2010 at 01:39:30PM +0200, Sander van Vugt wrote:
> On Sun, 2010-05-16 at 11:14 +0000, Andy Smith wrote:
> > On Sat, May 15, 2010 at 11:23:19PM -0400, justino garcia wrote:
> > > Which is faster: iSCSI to linux box over 1Gb or local SATA storage with
> > > intel ICH9?
> > 
> > You'll have to benchmark for your load, but local storage is usually
> > faster than remote at least because of the lower latency.
> 
> A simple test that I like doing to measure performance data is like:
> 
> time dd if=/dev/zero of=/mountpoint/dummyfile bs=1M count=1024
> 
> That writes a 1 GB file from the /dev/zero and tells you how long it
> took. I'd be interested to see the differences you measure between iSCSI
> and local storage. 

As a very very basic test that something isn't horribly wrong, fair
enough. I would really suggest something like bonnie++ for useful
benchmarks though. The problem with the above is that obviously it
only measures sequential single thread throughput. Increased latency
of requests is a big problem of remote/shared/virtualised storage
which the above won't really expose.

> Of course, I am aware that this is just one simple and limited test, but
> it gives an idea anyway.

bonnie++ is packaged and simple to run so there's really no excuse.
:)

Cheers,
Andy

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