Description of problem:
db2ldif -s <suffix1> -s <suffix2>
or
db2ldif -n <backend1> -n <backend2>
is not considering all the parameters.
The reason is rather obvious:
================
while getopts "hZ:vd:D:ENa:rs:x:CSut:n:UmMo1qc:" flag
do
    case $flag in
        h) usage
           exit 0;;
        Z) servid=$OPTARG;;
        n) benameopt="-n $OPTARG"
           required_param="yes";;
        s) includeSuffix="-s \"$OPTARG\""
           required_param="yes";;
        x) excludeSuffix="-x \"$OPTARG\"";;
=================
should be:
================
while getopts "hZ:vd:D:ENa:rs:x:CSut:n:UmMo1qc:" flag
do
    case $flag in
        h) usage
           exit 0;;
        Z) servid=$OPTARG;;
        n) benameopt=$benameopt" -n $OPTARG"
           required_param="yes";;
        s) includeSuffix=$includeSuffix" -s \"$OPTARG\""
           required_param="yes";;
        x) excludeSuffix=$excludeSuffix" -x \"$OPTARG\"";;
=================
Version-Release number of selected component (if applicable):
389-ds-base-1.3.4.0-29.el7.x86_64
(this is only RHEL7 issue. RHEL6 is doing the right way by passing the full
command line to ns-slapd db2ldif).
How reproducible: always
Steps to Reproduce: use multiple suffix in export, for instance
Workaround:
 change the script shown before.