Drive 5 on RS3617xs+ is severely damaged and has failed. Back up your data immediately <https://kb.synology.com/DSM/tutorial/How_to_back_up_your_Synology_NAS> and then replace the drive. Drive information Brand: Seagate Model: ST8000NM017B-2TJ103 Capacity: 7.3 TB Serial number: WWZ07VEH Firmware: SN01 S.M.A.R.T. Status: Failing Drive reconnection count: 0 Drive re-identification count: 0 Sign in to store2 (if not already) for more information. From store2