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

  • Article ID:100007541
  • Modified Date:
  • Product(s):

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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