How can I collect more information to diagnose problems with cluster lvm commands hanging or not returning quickly in Red Hat Enterprise Linux High Availability clusters with clvmd?

Several pieces of information can be valuable when attempting to determine why LVM commands are hanging in a Clustered LVM environment:

1. Run "very-verbose" LVM commands with strace to capture the system calls up and until the command hangs:

   # strace -f -s 1024 -o /tmp/vgdisplay.out vgdisplay -vvvv
   <ctrl+c after some time if the command hangs>
   

   <...>