Why was my file system placed in read only mode?

Issue

• Filesystem getting set read only due to hardware unavailability/inaccessibility.

  Jul  7 21:27:45 server kernel: sd 1:0:0:0: scsi: Device offlined - not ready after error recovery 
  Jul  7 21:27:45 server kernel: last message repeated 3 times
  Jul  7 21:27:45 server kernel: sd 1:0:1:0: scsi: Device offlined - not ready after error recovery
  Jul  7 21:27:46 server kernel: message repeated 12 times
  Jul  7 21:27:46 server kernel: sd 1:0:0:0: rejecting I/O to offline device
  Jul  7 21:27:46 server kernel: sd 1:0:0:0: rejecting I/O to offline device
  Jul  7 21:27:46 server kernel: Buffer I/O error on device dm-14, logical block 39937
  Jul  7 21:27:46 server kernel: lost page write due to I/O error on dm-14
  Jul  7 21:27:46 server kernel: sd 1:0:0:0: rejecting I/O to offline device
  Jul  7 21:27:46 server kernel: last message repeated 2 times
  Jul  7 21:27:46 server kernel: sd 1:0:1:0: rejecting I/O to offline device