added: retrieve ceph versions for compatibility checks

crossover

@@ -39,6 +39,8 @@ declare -A -g dvmids
 
 declare -g scluster
 declare -g dcluster
+declare -g scephversion
+declare -g dcephversion
 
 # global integers
 declare -g -i perf_freeze_ok=0
@@ -423,6 +425,9 @@ function mirror() {
     log info "Start mirror $(date "+%F %T")"
     startjob=$(date +%s)
 
+    get_ceph_version
+    log info "Local Ceph Version: $scephversion, Remote Ceph version: $dcephversion"
+
     #create pid file
     local pid_file="/var/run/$PROGNAME.pid"
     if [[ -e "$pid_file" ]]; then
@@ -883,6 +888,11 @@ function check_pool_exist() {
     echo $exists
 }
 
+function get_ceph_version() {
+    scephversion=$(ceph -v | cut -d " " -f 3)
+    dcephversion=$(ssh $opt_destination ceph -v | cut -d " " -f 3)
+}
+
 function main(){    
     [ $# = 0 ] && usage;