Is there any tools to do a performance test on AIX

[Nikolai086]

It's IBM ESS storage.
And I doubt that the performance is getting slow...

I do a test about the using time on copy data (about 100G) to internal Hdisk and Storage.

Storage to Storage : 52 mins
Storage to Hdisk: 40 mins

The same data!!

Does anyone know about the ESS storage? It should be faster than Hdisk, right? how much % would be faster?

Thank you!

--
Best Regards!
Hello, I am Nikolai NG, come from Carton, China. I love here.

 

[RMGBELGIUM]

euhm, same data , you will get non-representative results, because a part of the data will already be in cache.
if you are using a single thread with the copy, my guess is that hdisk will be faster.With ESS you have a Fiberchannel overhead.In multithread,the ESS wil be much more performant,as a head of a single disk can only be at 1 place at a time,while with a disk array you benefit of lots more spindles,thus more available heads to do simultanous writes.
You should use sth like IOmeter so you can use multiple threads.

rgds,

R.

 

[p5wizard]

Also, in ESS you have limited write cache (non-volatile storage), so that will be a speed-limiting factor in your test.

In real-life applications, you benefit from lots of spindles and large read cache in the ESS (much larger than write cache) with 80/20 or even better read/write ratio.

HTH,

p5wizard