LUNs are not being multipathed, individual DMP nodes created for each path to LUN

Problem

LUNs are not being multipathed, individual DMP nodes created for each path to LUN

Error Message

c4t500009720833351Cd0s2 auto:sliced     -            -            online
c4t5000097208333514d0s2 auto:sliced     -            -            online udid_mismatch
c6t5000097208333520d0s2 auto:sliced     -            -            online udid_mismatch
c6t5000097208333528d0s2 auto:sliced     -            -            online udid_mismatch

Cause

Possible causes in EMC  environment:

  • C bit  not set
  • SPC-2 bit is not set consistently for all device ports

Additional causes are that DMP  is being suppressed for some or all devices:

# cat etc/vx/vxdmp.exclude
exclude_all 1
paths
#
controllers
#
product
#
pathgroups
#

Solution

If exclusion is the cause this can be corrected by removing exclusion statement from vxdmp.exclude and rescanning device tree:

# rm /etc/vx/vxdmp.exclude
# rm /etc/vx/array.info
# rm /etc/vx/disk.info

# vxdctl enable

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