Hello Robert, What is the current Firmware of your MD3000i?  If the firmware is at 07.xx.xx.xx then you should be able to make the change on the fly without any issues.  If your firmware is at 06.xx.xx.xx then it could reboot when you make the change.   Since you state that you can’t have any down time I would schedule  some down time as in doing the change shouldn’t cause any issue.  However there has been cases that when you make the change that the controller will reboot.  I would say that if you could get about 1 hour of downtime should be enough to make the change.  It should only take about 20 minutes but at 1hr it gives you enough time that if the controller reboots that it will come back up still during downtime window.   Please let us know if you have any other questions.
We're connecting to a MD3000i, with dual RAID controllers, only through a single in-band connection.An iSCSI connection from 1 controller to the host server was the only cable attached to MD3000i and no other cables were connected. We recently added a few extra hard drives to the device for creating new disk groups that we want to configure from a remote location.That's why we now also connected the Ethernet management ports (of both controllers) to the network in order to get a more reliable connection by using the out-of-band management, However it's not working yet because the Ethernet ports still hold the old manual IP settings that we used in our test environment (which is a different range and subnet) and we need to change it to match the current network (which btw has no DHCP available). But when I want to apply the network changes in the storage manager, I get the following warning: [IMAGE] Now I'm confused what will happen with the storage array when I will accept this warning. The MD3000i is currently part of a production environment and I cannot afford any unannounced downtime of the device. Will accepting this (removing and re-adding to the management domain) have any affect on the status of currently used iSCSI in-band connection to the attached host? Any help would be greatly appreciated. Thanks! Robert The Hague, The Netherlands  
Changing Ethernet settings MD3000i (for out-of-band management)