For write-cache, if camcontrol fails, try smartctl.

camcontrol cannot change the cache settings on "ada" devices.

clientside/tmcc/common/checknode/diskcheck

 #! /bin/bash
 #
-# Copyright (c) 2013 University of Utah and the Flux Group.
+# Copyright (c) 2013-2017 University of Utah and the Flux Group.
 # 
 # {{{EMULAB-LICENSE
 # 
@@ -558,7 +558,11 @@ getwcache() {
 	fi
     elif [ "$os" == "FreeBSD" ] ; then
 	# try camcontrol first
-	cmc=$(which camcontrol)
+	if [ "$osrel" == "10" ] ; then
+	    cmc=$(which camcontrol10)
+	else
+	    cmc=$(which camcontrol)
+	fi
 #set -x
 	if [ "${cmc/camcontrol}" != "${cmc}" ] ; then
 	    sd=${1#/dev/}		
@@ -570,9 +574,10 @@ getwcache() {
 		printf " %s:%d "  "Setting WCE" ${$sd} >> ${logfile4tb}
 		/usr/local/etc/emulab/camwce -P on $sd  > /dev/null 2>&1
 	    fi
+	fi
 #set +x
-	else
-	# don't have don't have camcontrol, maybe we can use smartctl
+	# don't have don't have camcontrol or it did not work, try smartctl
+	if [ "$res" == "NA" ] ; then
 	    smtcl=$(findSmartctl_getopt)
 	    if [ "${smtcl/smartctl}" != "$smtcl" ] ; then
 		x=$($smtcl --get=wcache $1 | grep -i Write | grep -i cache)