Device-mapper-multipath is not reading SAN configuration settings from multipath.conf on Red Hat Enterprise Linux 5

Solution Verified - Updated -

Issue

  • Multipath does not take the configuration defined in multipath.conf and keeps the patch_checker as readsector0 instead of tur.

Environment

  • Red Hat Enterprise Linux 5 (RHEL5)

  • Multipathed storage from SAN, managed by device-mapper-multipath (dm-multipath)

    • /etc/multipath.conf contains a device section to modify default settings for SAN:
    device {
           vendor                  "EMC"
           product                 "SYMMETRIX"
           getuid_callout          "/lib/udev/scsi_id --whitelisted --page=pre-spc3-83 --device=/dev/%n"
           features                "0"
           hardware_handler        "0"
           path_selector           "round-robin 0"
           path_grouping_policy    multibus
           rr_weight               uniform
           no_path_retry           6
           rr_min_io               1000
           path_checker            tur
           prio                    const
      }
    • device-mapper-multipath is still using the default settings for this SAN, despite configuring alternative settings in /etc/multipath.conf.

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