Clustering : unable to configure persistence using restconf(netconf connector) on 3 node cluster

odl: https://nexus.opendaylight.org/content/repositories/opendaylight.snapshot/org/opendaylight/integration/distribution-karaf/0.3.0-SNAPSHOT/distribution-karaf-0.3.0-20150317.094607-668.tar.gz

installed features: odl-restconf odl-mdsal-clustering odl-restconf-all odl-openflowplugin-all odl-netconf-connector-all
installed bundles: mvn:org.jolokia/jolokia-osgi/1.1.5

-Xms128M -Xmx2048m -XX:MaxPermSize=512m

VM: fedora18, 6G ram,
java -version
java version "1.7.0_67"
Java(TM) SE Runtime Environment (build 1.7.0_67-b01)
Java HotSpot(TM) 64-Bit Server VM (build 24.65-b04, mixed mode)

i have installed 3 node cluster with config datastore shart persistence=false.
i wanted to switch it on (persistence=true) using restconf and postman

method: POST

url:http://g37:8181/restconf/config/network-topology:network-topology/topology/topology-netconf/node/controller-config/yang-ext:mount/

data:
<modules xmlns="urn:opendaylight:params:xml:ns:yang:controller:config">
<module xmlns="urn:opendaylight:params:xml:ns:yang:controller:config">
<type
xmlns:x="urn:opendaylight:params:xml:ns:yang:controller:config:distributed-datastore-provider">x:distributed-config-datastore-provider
</type>
<name>distributed-config-store-module</name>
<config-properties
xmlns="urn:opendaylight:params:xml:ns:yang:controller:config:distributed-datastore-provider">
<shard-transaction-idle-timeout-in-minutes>10</shard-transaction-idle-timeout-in-minutes>
<shard-journal-recovery-log-batch-size>5000</shard-journal-recovery-log-batch-size>
<persistent>true</persistent>
<operation-timeout-in-seconds>5</operation-timeout-in-seconds>
<shard-transaction-commit-timeout-in-seconds>30</shard-transaction-commit-timeout-in-seconds>
<shard-election-timeout-factor>2</shard-election-timeout-factor>
<shard-initialization-timeout-in-seconds>300</shard-initialization-timeout-in-seconds>
<enable-metric-capture>false</enable-metric-capture>
<transaction-creation-initial-rate-limit>100</transaction-creation-initial-rate-limit>
<shard-snapshot-data-threshold-percentage>12</shard-snapshot-data-threshold-percentage>
<shard-heartbeat-interval-in-millis>500</shard-heartbeat-interval-in-millis>
<bounded-mailbox-capacity>1000</bounded-mailbox-capacity>
<shard-leader-election-timeout-in-seconds>30</shard-leader-election-timeout-in-seconds>
<max-shard-data-change-executor-queue-size>1000</max-shard-data-change-executor-queue-size>
<max-shard-data-change-executor-pool-size>20</max-shard-data-change-executor-pool-size>
<shard-isolated-leader-check-interval-in-millis>5000</shard-isolated-leader-check-interval-in-millis>
<max-shard-data-store-executor-queue-size>5000</max-shard-data-store-executor-queue-size>
<shard-snapshot-batch-count>20000</shard-snapshot-batch-count>
<shard-batched-modification-count>100</shard-batched-modification-count>
<max-shard-data-change-listener-queue-size>1000</max-shard-data-change-listener-queue-size>
<shard-transaction-commit-queue-capacity>20000</shard-transaction-commit-queue-capacity>
</config-properties>
<config-schema-service
xmlns="urn:opendaylight:params:xml:ns:yang:controller:config:distributed-datastore-provider">
<name>yang-schema-service</name>
<type
xmlns:x="urn:opendaylight:params:xml:ns:yang:controller:md:sal:dom">x:schema-service
</type>
</config-schema-service>
</module>
</modules>

headers: accept and content-type to application/xml

I got 204 but using GET i always see persistence to be false. In the log lots ex exceptions appeared.

I expected to be able to put data to /restconf/config.