Purging entries from /etc/mountdtab on a cluster

Is there a procedure for purging old entries from /etc/mountdtab on TruCluster NFS servers?

The file has over 23,000 entries on one of our NFS servers, including entries for several hundred Linux clients which no longer exist.
This causes the RPC mountlist linked list to be so large that some clients (notably am-utils on Linux) run out of stack space when trying to work their way through it.

Is there a safe way to purge entries from this file? Is it sufficient to:

1) /sbin/init.d/nfs stop
on all TruCluster nodes
2) Remove all the obsolete entries
3) /sbin/init.d/nfs start
on all nodes

?

Thanks in advance.

Tim