DM-Multipath failing device paths after encountering SCSI reservations.

Solution Verified - Updated -

Issue

  • SCSI Reservations are causing multipath to fail even if there is no issue with underlying storage devices.
    This issue is present only with kernel versions older than kernel-3.10.0-693.el7.

  • Numerous scsi devices failing and path flapping errors recorded during SCSI persistence reservations events on multipath device:

    Dec 11 11:56:33 server1 kernel: sd 12:0:0:14: reservation conflict
    Dec 11 11:56:33 server1 kernel: sd 12:0:0:14: [sdar] tag#1 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_OK
    Dec 11 11:56:33 server1 kernel: sd 12:0:0:14: [sdar] tag#1 CDB: Write(10) 2a 00 59 fd ae 38 00 00 10 00
    Dec 11 11:56:33 server1 kernel: blk_update_request: critical nexus error, dev sdar, sector 1509797432
    Dec 11 11:56:33 server1 kernel: [416008.400797] device-mapper: multipath: Failing path 66:176.
    Dec 11 11:56:33 server1 kernel: device-mapper: multipath: Failing path 66:176.
    Dec 11 11:56:33 server1 multipathd: sdar: mark as failed
    Dec 11 11:56:33 server1 multipathd: 360000970000297500087533030303533: remaining active paths: 3 
    [...]
    Dec 11 11:56:33 server1 multipathd: 360000970000297500087533030303533: remaining active paths: 2
    

Environment

  • Red Hat Enterprise Linux 7
    • kernel versions older than kernel-3.10.0-693.el7

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