# Cannot replace RAID 1 Disk

I am running OMV Arrakis which is running excellenmt but now one of my two WD Red 8TB turned faulty as shown in the GUI

(shot smart.png)

From my understanding replacing the faulty unit means destroying the RAID, then physically replace a new disk and after

rebuiild the RAID

But I can't, the buttons for this are deactivated (see raid.png)

How come ? How can I replace the faulty drive ?