After a cleaning, a server's RAID controller says the whole array is missing and sounds an alarm. A cable to the disk backplane is unplugged. Which action fits?
Select an answer to reveal the explanation.
Short Explanation
The whole shelf of disks disappeared, and the cable that ties the shelf to the controller is hanging loose. You plug that cable back in before you declare the disks dead. Building a new stripe, replacing every disk, or muting the alarm leaves the shelf disconnected.
Full Explanation
A missing array, as opposed to one failed member, means the controller cannot see the set. An unplugged backplane cable explains that after a cleaning, so reconnecting the cable is the action that can bring the array back. Creating a RAID 0 on empty disks destroys any chance of recovering the original set and does not seat the cable. Replacing every disk assumes all of them failed at once during a cleaning. The visible fault is the cable, not a stack of dead disks. Silencing the alarm hides the symptom and leaves the backplane disconnected, so the array stays missing. Exam caveat: power the server down before you seat a backplane cable unless the hardware is built to be hot-plugged. Forcing a connector on a live backplane can be its own outage. Operational check: seat the cable, power on, and confirm the controller lists the original array before you import anything new. Power the server down before you seat the backplane cable unless the chassis is built for a hot plug. Confirm the original array name is back before anyone creates a new set.