Check nvme controller attachment

NSID=1

for CID in $(seq 0 65); do
    echo "Trying controller $CID..."
    nvme detach-ns /dev/nvme0 -n $NSID -c $CID 2>/dev/null
    nvme attach-ns /dev/nvme0 -n $NSID -c $CID
    echo 1 > /sys/class/nvme/nvme0/rescan_controller

    # Check if namespace appears
    if ls /dev/nvme0n1 &>/dev/null; then
        echo "✅ SUCCESS: Namespace attached to controller $CID"
        ls -l /dev/nvme0n1
        nvme list
        break
    else
        echo "❌ No device node for controller $CID"
    fi
done