help regarding Guardian Maximus Raid enclosure

[macchiato2009]

hi

just received my enclosure, put 2 x Seagate 3 Tb inside, have them formatted with my mac

but i am very surprised to see only the HDD1 led blinking during use, HDD2 led remains off at all times

i was wondering if the enclosure is defective or if Raid1 is working correctly

anyone having the same issue, advices are welcomed

thanks