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EVA 8000 Events

 
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Occasional Advisor

Re: EVA 8000 Events

Hi,
It is Windows 2003 servers. Is it possible that a problem from the host side (multi-pathing software)can be responsible for the LUN failovers on the EVA? It is a NSPOF setup.

Thanx
Manie
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Honored Contributor

Re: EVA 8000 Events

Yes, a host can force a path switch.

It is also possible that this is an optimization operation by the controller firmware. If it finds out that a lot of traffic goes through the proxy controller for a given virtual disk, it moves it to this controller in order to offload the mirror ports.
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Honored Contributor

Re: EVA 8000 Events

Manie,

In my opinion, Vdisk movements between TOP and BOTTOM HSV controller is based on the usage of particular Vdisk. In a scenario, if the BOTTOM HSV is receiving more IOs and Vdisk is presented on TOP HSV, it will be moved to BOTTOM HSV. This is independent from Host load balancing but you can still confirm if you have set the load balancing policy on your host or not? Run the command "hpdsm devices" and look under Policy column.
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Honored Contributor

Re: EVA 8000 Events

Hi,

> Is it possible that a problem from the host side (multi-pathing software)can be responsible for the LUN failovers on the EVA?

What multi-pathing software are you using ?

It's probably also worth checking that the host OS is configured properly for the hosts in Command View...

Cheers,

Rob
Occasional Advisor

Re: EVA 8000 Events

Thanx