SCSI sense key:Medium Error and error: return code = 0x08070002, 0x08100002, or 0x08000002

Question

• 在日志中出现 Medium Error sense key 信息。
  • SCSI error: driverbyte=DRIVER_SENSE plus Medium Error sense key
  • SCSI error: return code 0x08070002 plus Medium Error sense key
  • SCSI error: return code 0x08000002 plus Medium Error sense key
  • SCSI error: return code 0x08100002 plus Medium Error sense key
• 磁盘出现问题：
  • 对于多路径，可能会出现持续的路径故障切换。
  • 对于挂载的文件系统，以只读形式重新挂载。
  • 它可能发生在一个 lun 中或一组 lun 中。
• /var/log/messages 包含以下形式的或类似的事件

 sd 0:0:0:0: [sda] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
 sd 0:0:0:0: [sda] Sense Key : Medium Error [current]
 sd 0:0:0:0: [sda] Add. Sense: Unrecovered read error

or

kernel: sd 6:0:2:0: SCSI error: return code = 0x08100002
kernel: Result: hostbyte=invalid driverbyte=DRIVER_SENSE,SUGGEST_OK
kernel: sde: Current: sense key: Medium Error
kernel:     Add. Sense: Record not found

or

 kernel: sd 1:0:5:14: [sdhl] Add. Sense: Unrecovered read error - recommend reassignment
 kernel: sd 1:0:5:14: [sdhl] CDB: Read(10): 28 00 04 45 a6 70 00 00 08 00
 kernel: sd 3:0:5:14: [sduj] Unhandled sense code
 kernel: sd 3:0:5:14: [sduj] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
 kernel: sd 3:0:5:14: [sduj] Sense Key : Medium Error [current] 

or
 kernel blk_update_request: critical medium error, dev sde, sector 1025000000
 kernel sd 4:2:4:0: [sde] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
 kernel sd 4:2:4:0: [sde] tag#0 Sense Key : Medium Error  [current]
 kernel sd 4:2:4:0: [sde] tag#0 Add. Sense: Unrecovered read error
 kernel sd 4:2:4:0: [sde] tag#0 CDB: Read(10) 28 00 3d 22 60 00 00 02 00 00
 kernel blk_update_request: critical medium error, dev sde, sector 1025662976

or

kernel: sd 1:0:0:2: SCSI error: return code = 0x08070002 
kernel: sdab: Current: sense key: Medium Error  
kernel:     Add. Sense: Unrecovered read error  
kernel: end_request: I/O error, dev sdab, sector 83235271  
kernel: device-mapper: multipath: Failing path 65:176.  
multipathd: dm-8: add map (uevent)  
multipathd: dm-8: devmap already registered