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What does the "scsi reservation conflict" message mean in RHEL and how can I resolve it?

Updated 2014-04-10T17:41:24+00:00

Issue

  • How can I tell if persistent reservations on SCSI devices is causing them not to mount after a cluster event?
  • What does the message "reservation conflict" mean?
Oct 20 18:17:20 redhat kernel: scsi1 (0,5,0) : reservation conflict
Oct 20 18:17:20 redhat kernel: SCSI error : <1 0 5 0> return code = 0x18
Oct 20 18:17:20 redhat kernel: end_request: I/O error, dev sdg, sector 1331359
Oct 20 18:17:20 redhat kernel: scsi1 (0,5,0) : reservation conflict
Oct 20 18:17:20 redhat kernel: SCSI error : <1 0 5 0> return code = 0x18
Oct 20 18:17:20 redhat kernel: end_request: I/O error, dev sdg, sector 1331360
  • The following I/O errors and SCSI status errors relate to one of the mounted disk, and the filesystem is being remounted in the read-only mode:
Nov  7 05:15:25 xxxx kernel: sd 0:0:1:0: reservation conflict
Nov  7 05:15:25 xxxx kernel: sd 0:0:1:0: SCSI error: return code = 0x00000018
Nov  7 05:15:25 xxxx kernel: end_request: I/O error, dev sdb, sector 36335
Nov  7 05:15:25 xxxx kernel: Buffer I/O error on device sdb1, logical block 4534
Nov  7 05:15:25 xxxx kernel: lost page write due to I/O error on sdb1
Nov  7 05:15:25 xxxx kernel: Aborting journal on device sdb1.
Nov  7 05:15:26 xxxx kernel: ext3_abort called.
Nov  7 05:15:26 xxxx kernel: EXT3-fs error (device sdb1): ext3_journal_start_sb: Detected aborted journal
Nov  7 05:15:26 xxxx kernel: Remounting filesystem read-only
  • Having trouble issuing I/O or am getting I/O errors on a device that is reporting a reservation conflict
  • Commands that access shared storage are taking a long time to complete, or fail, with SCSI status errors and reservation conflict messages in the logs.
  • System hangs during boot with fiber-channel LUNs presented, and "reservation conflict" messages are seen.
  • GFS file system will not mount, followed by reservation conflicts.

Environment

  • Red Hat Enterprise Linux (RHEL) 4
  • Red Hat Enterprise Linux (RHEL) 5
  • Red Hat Enterprise Linux (RHEL) 6

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