topic EVA 8100 in Disk Enclosures

EVA 8100

UVA — Wed, 20 Feb 2008 11:32:53 GMT

Hi,

Greetings of the Day

I Have one fresh EVA 8100 with 2C6D conf.
In my all disk enclousers there are 14 disks
with 146gb,15k, the disks are starting from the slot 1 to slot 12. the rest of the slot 13 and 14 are empty

Now what my doupt is can i remove the disks from slot 7 and 8, put in to slot 13 and 14 in my all enclosures?

If i do this it will give me good I/O performance?

or there is no matter abot the drive slot?

Re: EVA 8100

Rob Leadbeater — Wed, 20 Feb 2008 11:54:47 GMT

Hi,

As far as I'm aware, the position of the disks won't have any impact on performance.

Do you have a particular problem that you're trying to resolve ?

Cheers,

Rob

Re: EVA 8100

Torsten. — Wed, 20 Feb 2008 11:58:45 GMT

Why should the slot number have any impact to performance?

Re: EVA 8100

UVA — Thu, 21 Feb 2008 05:05:03 GMT

HI,

I dont't have any problem with the slots,
its just for the knowledge base only.

Becoz one of my collige told me, if we do like this it will give good I/O performace,
The load will fall equally on both sides

Thanks.

Re: EVA 8100

Uwe Zessin — Thu, 21 Feb 2008 07:27:44 GMT

> The load will fall equally on both sides

No, no, no. The EVA virtualization software will spread the load equally on all disk drives in a disk group. It is not documented, but I have been told that the EVA can even move data between disk drives if the software detects hot spots.

Re: EVA 8100

IBaltay — Mon, 17 Mar 2008 20:07:26 GMT

Hi,
a) it is perfectly possible, but you have to use the ungroup feature and ungroup only 1 disk at a time (or more than one but with the different RSSs)
b) it make no sense, you will not get any additional performance, the leveling/distribution among all disks is hardcoded in the controller firmware