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
Device Model: ST6000NM0115-1YZ110
Serial Number: ZAD27CCS
(failing) /dev/sdb
Model Family: Seagate Enterprise Capacity 3.5 HDD
Device Model: ST6000NM0115-1YZ110
Serial Number: ZAD27C4P
Almost dead disk on storage1.staging:
/dev/sda
Model Family: Seagate Enterprise Capacity 3.5 HDD
Device Model: ST6000NM0115-1YZ110
Serial Number: ZAD0S2NR
/dev/sdb
Model Family: Seagate Enterprise Capacity 3.5 HDD
Device Model: ST6000NM0115-1YZ110
Serial Number: ZAD0SD5D