How can you reduce the level of logs printed to the console in RHEL?

Issue

• An application outputs kernel warning message to console. How can the messages be suppressed?
• SCSI errors generated are too much. The level of messages are ok  if the server only has a few SAN devices, but when the server has  several hundred, it's constantly logging SCSI errors.

• Is there  anyway to surpress these scsi errors?

  Current sdli: sense key Medium Error
  Additional sense: Unrecovered read error
  scsi5: ERROR on channel 0, id 0, lun 136, CDB: Read (10) 00 00 00 00 00 00 00 01 00 
  Current sdlj: sense key Medium Error
  Additional sense: Unrecovered read error
  scsi6: ERROR on channel 0, id 0, lun 135, CDB: Read (10) 00 00 00 00 00 00 00 01 00 
  Current sduh: sense key Medium Error
  Additional sense: Unrecovered read error
  scsi6: ERROR on channel 0, id 0, lun 140, CDB: Read (10) 00 00 00 00 00 00 00 01 00 
  Current sdum: sense key Medium Error
  Additional sense: Unrecovered read error
  scsi6: ERROR on channel 0, id 0, lun 144, CDB: Read (10) 00 00 00 00 00 00 00 01 00 
  Current sduq: sense key Medium Error
  Additional sense: Unrecovered read error
  scsi7: ERROR on channel 0, id 0, lun 135, CDB: Read (10) 00 00 00 00 00 00 00 01 00 
  Current sdads: sense key Medium Error
  Additional sense: Unrecovered read error
  scsi4: ERROR on channel 0, id 0, lun 135, CDB: Read (10) 00 00 00 00 00 00 00 01 00