SCSI エラー後にファイルシステムが読み取り専用になる

Issue

• 以下のエラーメッセージが発生し、VMware 仮想マシンのファイルシステムが読み取り専用として再マウントされました。

  Mar  2 20:16:07 vm1 kernel: sd 2:0:1:0:[sdb]  Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
  Mar  2 20:16:07 vm1 kernel: sd 2:0:1:0:[sdb]  Sense Key :Not Ready [current] 
  Mar  2 20:16:07 vm1 kernel: sd 2:0:1:0:[sdb]  Add.Sense:No additional sense information
  Mar  2 20:16:07 vm1 kernel: sd 2:0:1:0:[sdb] CDB:Write(10):2a 00 00 00 30 10 00 00 10 00
  Mar  2 20:16:07 vm1 kernel: end_request:I/O error, dev sdb, sector 12304
  Mar  2 20:16:07 vm1 kernel:Buffer I/O error on device dm-4, logical block 1026
  Mar  2 20:16:07 vm1 kernel: lost page write due to I/O error on dm-4
  Mar  2 20:16:07 vm1 kernel:Buffer I/O error on device dm-4, logical block 1027
  Mar  2 20:16:07 vm1 kernel: lost page write due to I/O error on dm-4
  Mar  2 20:16:07 vm1 kernel: sd 2:0:1:0:[sdb]  Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
  Mar  2 20:16:07 vm1 kernel: sd 2:0:1:0:[sdb]  Sense Key :Not Ready [current] 
  Mar  2 20:16:07 vm1 kernel: sd 2:0:1:0:[sdb]  Add.Sense:No additional sense information
  Mar  2 20:16:07 vm1 kernel: sd 2:0:1:0:[sdb] CDB:Write(10):2a 00 00 00 40 18 00 00 08 00
  Mar  2 20:16:07 vm1 kernel: end_request:I/O error, dev sdb, sector 16408
  Mar  2 20:16:07 vm1 kernel:Buffer I/O error on device dm-4, logical block 1539
  Mar  2 20:16:07 vm1 kernel: lost page write due to I/O error on dm-4
  Mar  2 20:16:07 vm1 kernel:JBD:Detected IO errors while flushing file data on dm-4
  Mar  2 20:16:07 vm1 kernel:EXT3-fs unexpected failure: buffer_uptodate(jh2bh(jh));
  Mar  2 20:16:07 vm1 kernel:Possible IO failure.
  Mar  2 20:16:07 vm1 kernel: 
  Mar  2 20:16:07 vm1 kernel:EXT3-fs unexpected failure: buffer_uptodate(jh2bh(jh));
  Mar  2 20:16:07 vm1 kernel:Possible IO failure.