There is at least one disk on each server having dead sectors.
They should be still covered by the manufacturer warranty.
Almost dead disk on db1.staging :
Model Family: Seagate Enterprise Capacity 3.5 HDD
Serial Number: ZAD27CCS
Almost dead disk on storage1.staging:
Model Family: Seagate Enterprise Capacity 3.5 HDD
Serial Number: ZAD0S2NR