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** :
(suspicious) /dev/sda
Model Family: Seagate Enterprise Capacity 3.5 HDD
Serial Number: ZAD27CCS
(failing) /dev/sdb
Model Family: Seagate Enterprise Capacity 3.5 HDD
Serial Number: ZAD27C4P
Almost dead disk on **storage1.staging**:
/dev/sda
Model Family: Seagate Enterprise Capacity 3.5 HDD
Serial Number: ZAD0S2NR