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## EVA6000 I/O calculation

Hello Everybody,
I want to calculate I/O bandwidth of my disk array. It is an EVA 6000 with 28 disks.
I found the following link in regards of my question. In the below link Uwe, offer a formula:
I/O bandwidth / number of disk / chunk size =IOPS
They talked about an EVA 4000.
Now, I want to calculate maximum I/O bandwidth of my EVA with that formula. However I do not know what chunk size is and how much IOPS each 15rpm disk has.
5 REPLIES
Honored Contributor

## Re: EVA6000 I/O calculation

EVAs uses fixed 256k chunk size, but I don't know if that formula will give you the real IOPS that the EVA will perform. For the I/O bandwidth, check the eva quickspecs.
Por que hacerlo dificil si es posible hacerlo facil? - Why do it the hard way, when you can do it the easy way?
Honored Contributor
Solution

## Re: EVA6000 I/O calculation

The EVA6000 uses the same controller (HSV200) like the EVA4000 - the controller does not know if it is working in an EVA4000 or 6000 ;-)

The EVA3000/5000 use a chunk size of 128 KBytes - my guess is that the 4000/6000/8000 use the same size.

The formular only makes sense for large sequential transfers - random I/Os with large seek distances will kill result in smaller MB/s throughput.
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Honored Contributor

## Re: EVA6000 I/O calculation

Uwe is right, my mistake, The chunk size is 128KB (256 blocks), fixed.
Por que hacerlo dificil si es posible hacerlo facil? - Why do it the hard way, when you can do it the easy way?