Im not been able to start it with your code...
Regarding the space there is a lot of free space..
gdb --args /usr/bin/mserver5 --dbpath=/opt/monetdb/CUSTOMERnew/sb_traf --set merovingian_uri=mapi:monetdb://CUSTOMER-monetbd:54321/sb_traf --set mapi_open=false --set mapi_port=0 --set mapi_usock=/opt/monetdb/CUSTOMERnew/sb_traf/.mapi.sock --set monet_vault_key=/opt/monetdb/CUSTOMERnew/sb_traf/.vaultkey --set gdk_nr_threads=8 --set max_clients=64 --set sql_optimizer=default_pipe --set monet_daemon=yes --dbinit="sql.start();"
GNU gdb (GDB) Red Hat Enterprise Linux 7.6.1-80.el7
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Reading symbols from /usr/bin/mserver5...Reading symbols from /usr/bin/mserver5...(no debugging symbols found)...done.
(no debugging symbols found)...done.
Missing separate debuginfos, use: debuginfo-install MonetDB5-server-11.21.19-20160405.el7.centos.x86_64