The NDB Cluster Auto-Installer (No longer supported) Figure 23.10 The NDB Cluster Auto-Installer Define Cluster screen This screen and subsequent screens also include  Settings  and  Help  menus which are described later in this section; see NDB Cluster Installer Settings and Help Menus. The  Define Cluster  screen allows you to set three sorts of properties for the cluster: cluster properties, SSH properties, and installation properties. Cluster properties that can be set on this screen are listed here: • Cluster name : A name that identifies the cluster; in this example, this is  mycluster-1 . The name is set on the previous screen and cannot be changed here. • Host list : A comma-delimited list of one or more hosts where cluster processes should run. By default, this is  127.0.0.1 . If you add remote hosts to the list, you must be able to connect to them using the credentials supplied as SSH properties. • Application type : Choose one of the following: 1. Simple testing : Minimal resource usage for small-scale testing. This the default.  Not intended for production environments . 2. Web : Maximize performance for the given hardware. 3. Real-time : Maximize performance while maximizing sensitivity to timeouts in order to minimize the time needed to detect failed cluster processes. • Write load : Choose a level for the anticipated number of writes for the cluster as a whole. You can choose any one of the following levels: 1. Low : The expected load includes fewer than 100 write transactions for second. 2. Medium : The expected load includes 100 to 1000 write transactions per second; this is the default. 4013