[MonetDB-users] monetdb clustering

Hi guys, What types of clustering does monetdb support? Sharding? Master/Slave? if it is Master/Slave does it support multi master? or all writes must go to master node? In clustering documentation (http://www.monetdb.org/Documentation/Cookbooks/Recipes/Cluster) there is paragraph: willem% monetdb -h cruquius -P mypassphraseset shared=pump/2/harvey pump willem% monetdb -h lijnden -P mypassphraseset shared=pump/2/fox pump willem% monetdb -h leeghwater -P mypassphraseset shared=pump/1/harvey pump What are those 1, 2, fox, harvey?