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reservation conflict in /var/log/message

gilproduction
Occasional Visitor

reservation conflict in /var/log/message

We have
two DL380G5s(IMMS1(active), IMMS2(standby)),
(OS:Linux 2.6.9-55.0.2.ELsmp)
4 FC2142SRs(two per server)
and one MSA1000(F/W:5.20, only 1 LUN).
And life-keeper is running.

Everything is OK and looks good, but below is seen on IMMS2.
There was no fail-over at that date.


In what situation do these messages occur?
(/dev/sda1 : LUN in MSA1000)

===================cut======================
Mar 16 14:25:38 IMMS2 kernel: scsi0 (0,0,1) : reservation conflict

Mar 16 14:25:38 IMMS2 kernel: SCSI error : <0 0 0 1> return code = 0x18

Mar 16 14:25:38 IMMS2 kernel: end_request: I/O error, dev sda, sector 63

Mar 16 14:25:38 IMMS2 kernel: Buffer I/O error on device sda1, logical block 0

Mar 16 14:25:38 IMMS2 kernel: scsi0 (0,0,1) : reservation conflict

Mar 16 14:25:38 IMMS2 kernel: SCSI error : <0 0 0 1> return code = 0x18

Mar 16 14:25:38 IMMS2 kernel: end_request: I/O error, dev sda, sector 64

Mar 16 14:25:38 IMMS2 kernel: Buffer I/O error on device sda1, logical block 1

Mar 16 14:25:38 IMMS2 kernel: scsi0 (0,0,1) : reservation conflict

Mar 16 14:25:38 IMMS2 kernel: SCSI error : <0 0 0 1> return code = 0x18

Mar 16 14:25:38 IMMS2 kernel: end_request: I/O error, dev sda, sector 65

Mar 16 14:25:38 IMMS2 kernel: Buffer I/O error on device sda1, logical block 2

Mar 16 14:25:38 IMMS2 kernel: scsi0 (0,0,1) : reservation conflict

Mar 16 14:25:38 IMMS2 kernel: SCSI error : <0 0 0 1> return code = 0x18

Mar 16 14:25:38 IMMS2 kernel: end_request: I/O error, dev sda, sector 66

Mar 16 14:25:38 IMMS2 kernel: Buffer I/O error on device sda1, logical block 3

Mar 16 14:25:38 IMMS2 kernel: scsi0 (0,0,1) : reservation conflict

Mar 16 14:25:38 IMMS2 kernel: SCSI error : <0 0 0 1> return code = 0x18

Mar 16 14:25:38 IMMS2 kernel: end_request: I/O error, dev sda, sector 67

Mar 16 14:25:39 IMMS2 kernel: Buffer I/O error on device sda1, logical block 4
====cut (repeat until logical block 127)=====


Any idea ?
Thanks in advance.