When pulling drives, or swapping between systems, the LSI array controller can put the drive and/or raid configuration into an inactive state. From past experience, this occurs, roughly 50% of the time. We currently do not have a policy to place drives/raid into an active state. I believe this has been filled as an enhancement i for the UCS.
In order to re-activate the drive/raid, they need to reboot and get into the LSI option rom and re-activate the drive and/or raid configuration.
Without looking at the LSI screen, I’d suspect one of the drives in the raid-1 (mirror) has been disabled from the removal process. They just need to re-enable it.
Mike & Dave