topic Re: Application QOS on EVA , in HPE EVA Storage

Application QOS on EVA ,

Gérard Wendling — Mon, 09 Nov 2009 17:31:51 GMT

Hello,

I would like to know if it possible on an EVA8400 to prioritize I/O depending on applications ?

Thank's in advance.
Gerard

Re: Application QOS on EVA ,

Dileep.. — Tue, 10 Nov 2009 00:29:36 GMT

EVA hs no capability do this.

Re: Application QOS on EVA ,

Sheldon Smith — Tue, 10 Nov 2009 00:37:22 GMT

There is no prioritization functionality in the EVA family.

Why do you think you need such a capability? What problem are you trying to solve?

Re: Application QOS on EVA ,

Uwe Zessin — Tue, 10 Nov 2009 05:50:35 GMT

Such requests are sometimes listed in calls for bids. E.g. I have seen on request that the backup software must not use more than 20% of the system ressources - oh well...

Re: Application QOS on EVA ,

Gérard Wendling — Tue, 10 Nov 2009 07:59:05 GMT

Thank's to all,

It is a customer request to priorize production I/O against test or developpment I/O.

Regards
Gerard

Re: Application QOS on EVA ,

skt_skt — Tue, 10 Nov 2009 11:59:30 GMT

customer should not keep PROD & DEV/QA on the same place.

Re: Application QOS on EVA ,

Sheldon Smith — Tue, 10 Nov 2009 14:41:52 GMT

I think the customer would have to work very hard to saturate the controller CPUs. How about spliting into "Production" and "Development and Testing" disk groups?

Re: Application QOS on EVA ,

Gérard Wendling — Tue, 10 Nov 2009 14:58:45 GMT

Saturate CPU ? perhaps not but may be cache utilisation ...
Anyway the customer put this as a prerequired fonctionnality. I think possibly he wants an EMC SAN that implement this and so he reduce the scope of competitors.
gerard

Re: Application QOS on EVA ,

Sheldon Smith — Tue, 10 Nov 2009 15:09:56 GMT

Cache utilisation? It's an 8400. How much cache does the 8400 have now? What about bumping it to 22 GB?

Re: Application QOS on EVA ,

Gérard Wendling — Tue, 10 Nov 2009 15:21:22 GMT

Yes , customes spÃ©cification said "10Gb minimal per contrÃ´ler" so i wanted to propose a 8400/22Gb But this pre-required application Qos is still missing in EVA world.

Re: Application QOS on EVA ,

Rob Leadbeater — Wed, 11 Nov 2009 10:29:59 GMT

Hi Gerard,

I know it can be difficult, but you should try to push back to the customer and state that their prerequisites are not necessarily relevant.

Requesting that an array has a certain amount of cache, is pointless when the way that the array uses that cache can be completely different between different vendors' arrays.

For QoS you *might* be able to do something at the SAN switch level.

Cheers,

Rob

Re: Application QOS on EVA ,

Gérard Wendling — Thu, 12 Nov 2009 08:22:31 GMT

Youre right Rob, but a think customers spÃ©cifications are "oriented" for a specific SAN.

How can Qos be done at the switch level ?