EVA8100 - Any impact while setting failback preference setting online.

[junmeng]

Hi,

Has anyone change their failback perference settings while applications are running online?

Any performance impact?

Thanks!

[sreekanthtm · Accepted solution]

Hi,

Preferred path/mode -- Designate one controller, arbitrarily, as path A, and the other as path B. This setting provides a way of initially distributing the virtual disk load evenly between controllers. During operation, this path preference can be overridden later.

Failover only â Controller turns over control of all its virtual disks to the
other controller and remains inoperative.

Failover and failback â Controller turns over control of all its virtual disks to the other controller. If the condition that caused the failover no
longer exists, the controller automatically takes control of its own virtual disks again

You can change the preference online. And there won't be any performance impact if you are selecting "Failover and failback".

Rgds,
Sreekanth.

[junmeng]

Hi,

Assuming you change the failover setting for a particular vdisk to Path A Failover. (Assuming Controller B is the managing controller)

Will the setting take effect immediately when you click save in Command View EVA?

[J Peak]

The setting takes effect immediately.
We have done this on production volumes during the day.

During operation, the managing controller may change depending on your setting and circumstances. We have never had any impact by this change.

[junmeng]

Thanks for your help!

[junmeng]

Answer found!