When one of the paths to the LUN was disconnected from SAN, filesystem going to read-only mode messages will appear before the multipathd fails path.

Issue

• Filesystem goes to read-only mode when of the paths to the LUN from SAN was disconnected. Here filesystem going to read-only messages [1] will appear before the multipathd failing paths [2].

Aug 20 18:03:03 hostname kernel:  rport-5:0-0: blocked FC remote port time out: saving binding
Aug 20 18:03:03 hostname kernel: sd 5:0:0:0: Unhandled error code
Aug 20 18:03:03 hostname kernel: sd 5:0:0:0: SCSI error: return code = 0x00010000
Aug 20 18:03:03 hostname kernel: Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK,SUGGEST_OK
Aug 20 18:03:03 hostname kernel: sd 5:0:0:0: Unhandled error code
Aug 20 18:03:03 hostname kernel: sd 5:0:0:0: SCSI error: return code = 0x00010000
Aug 20 18:03:03 hostname kernel: Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK,SUGGEST_OK
Aug 20 18:03:03 hostname kernel: Aborting journal on device dm-18.               <<<<<<<<<<<<<<<<  [1]
Aug 20 18:03:03 hostname kernel: EXT3-fs error (device dm-18) in ext3_dirty_inode: IO failure
Aug 20 18:03:03 hostname kernel: EXT3-fs error (device dm-18) in ext3_reserve_inode_write: Journal has aborted
Aug 20 18:03:03 hostname kernel: sd 5:0:0:0: Unhandled error code
Aug 20 18:03:03 hostname kernel: sd 5:0:0:0: SCSI error: return code = 0x00010000
Aug 20 18:03:03 hostname kernel: Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK,SUGGEST_OK
Aug 20 18:03:03 hostname multipathd: dm-6: add map (uevent) 
Aug 20 18:03:03 hostname kernel: Buffer I/O error on device dm-18, logical block 0
Aug 20 18:03:03 hostname kernel: lost page write due to I/O error on dm-18
Aug 20 18:03:03 hostname kernel: EXT3-fs error (device dm-18) in ext3_reserve_inode_write: Journal has aborted
Aug 20 18:03:03 hostname kernel: EXT3-fs error (device dm-18) in ext3_reserve_inode_write: Journal has aborted
Aug 20 18:03:03 hostname kernel: sd 5:0:0:0: Unhandled error code
Aug 20 18:03:03 hostname kernel: sd 5:0:0:0: SCSI error: return code = 0x00010000
Aug 20 18:03:03 hostname kernel: Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK,SUGGEST_OK
Aug 20 18:03:03 hostname kernel: Buffer I/O error on device dm-18, logical block 585
Aug 20 18:03:03 hostname kernel: lost page write due to I/O error on dm-18
Aug 20 18:03:03 hostname kernel: sd 5:0:0:0: Unhandled error code
Aug 20 18:03:03 hostname kernel: sd 5:0:0:0: SCSI error: return code = 0x00010000
Aug 20 18:03:03 hostname kernel: Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK,SUGGEST_OK
Aug 20 18:03:03 hostname kernel: Buffer I/O error on device dm-18, logical block 0
Aug 20 18:03:03 hostname kernel: lost page write due to I/O error on dm-18
Aug 20 18:03:03 hostname kernel: EXT3-fs error (device dm-18) in ext3_dirty_inode: Journal has aborted
Aug 20 18:03:03 hostname kernel: ext3_abort called.
Aug 20 18:03:03 hostname kernel: EXT3-fs error (device dm-18): ext3_journal_start_sb: Detected aborted journal


Aug 20 18:03:03 hostname multipathd: 65:48: mark as failed           <<<<<<<<<<<<<< [2]
Aug 20 18:03:03 hostname kernel: sd 5:0:0:2: SCSI error: return code = 0x00010000
Aug 20 18:03:03 hostname multipathd: mpath3: remaining active paths: 1 
Aug 20 18:03:03 hostname kernel: Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK,SUGGEST_OK
Aug 20 18:03:03 hostname kernel: sd 5:0:0:2: Unhandled error code
Aug 20 18:03:03 hostname multipathd: 65:0: mark as failed 
Aug 20 18:03:03 hostname kernel: sd 5:0:0:2: SCSI error: return code = 0x00010000
Aug 20 18:03:03 hostname multipathd: mpath0: remaining active paths: 1 
Aug 20 18:03:03 hostname kernel: Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK,SUGGEST_OK
Aug 20 18:03:03 hostname multipathd: 65:64: mark as failed 
Aug 20 18:03:03 hostname kernel: EXT3-fs error (device dm-25) in ext3_reserve_inode_write: Journal has aborted
Aug 20 18:03:03 hostname multipathd: mpath4: remaining active paths: 1 
Aug 20 18:03:03 hostname kernel: sd 5:0:0:3: Unhandled error code