The following procedure demonstrates how the "udid_mismatch" flag can be set for a logical unit number(LUN):

1.  Destroy diskgroup
2.  vxdiskunsetup the disk(s)
3.  Remove the disk assignment (vxdisk rm)
4.  Remove LUN assignment from the Operating System (OS).
5.  Add new LUNS that re-use the original assignment
6. vxconfigd-k  

This procedure can result in the reused disks beingf lagged:

$ vxdisk list
DEVICE TYPE DISK GROUP STATUS
sdi auto:cdsdisk sdi test6dg onlineudid_mismatch
sdj auto:cdsdisk sdjtest6dg online udid_mismatch



Workaround:

After step 3 disable all paths too the lun using vxdmpadm.  For example for a LUN with two paths (Execute vxdisk list sd(x)' to determine the paths)

vxdmpadm disable path=sd(x)
vxdmpadm -f disable path=sd(y) [last path to diskrequires -f flag]

Afte re-adding the luns, execute 'vxconfigd -k' or 'vxdctl enable,' and manually enable the paths (if still in disabled state):

vxdmpadm enable path=sd(x)
vxdmpadm enable path=sd(y)