@Paresh,
To be honest, your partitions seem to be a little bit strange, given the distribution of disk space.
In general, it is not adviceable to change the partitions, that would be equivalent to asking for problems and/or resulting in the necessity to (partially or fully) re-install the server.
A potential alternative and solution to your problem is to change the DUMP_D variable in the /etc/psa/psa.conf file.
The value for the DUMP_D variable could or should be something in the mounted directory /home, for instance /home/backup would suffice.
When changing the DUMP_D variable, the sw-cp-server should be restarted afterwards, in order to have the changes take effect.
Hope the above helps a little bit.
Regards....