System Access - IBM Power Systems 775 Manual

stopsrc -s pnsd
sed 's/log_file_size = 10485760/log_file_size = 104857600/' /etc/PNSD.cfg >
/etc/PNSD.cfg.new
cp -p /etc/PNSD.cfg.new /etc/PNSD.cfg
startsrc -s pnsd

2.1.2 System access

This section describes the system access component.
Login/Gateway node
The utility CEC provides users with an entry point to the Power 775 cluster through a utility
node, which is configured as a Login/Gateway node. For most configurations, the LPAR utility
node is in octant 0, with 75% of processor and memory resources. This resource allocation
represents three POWER7 chips and respective memory resources. The remaining 25% (one
POWER7 processor and its resources) is designated to the service node (SN). For more
information about resource requirements for service and utility nodes, see 1.7.3, "Service
node" on page 54, and 1.7.7, "Utility nodes" on page 58.
The Login/Gateway node connects to the public VLAN (GbE or 10GbE) and allows users to
access the system resources, which include development and runtime environments. More
network adapter cards are attached to available PCI slots and assigned to the Login node
LPAR to provide this connectivity, as shown in Figure 2-1.
Figure 2-1 Network layout example
User (home) directories are in GPFS. The directory /sn_local or the shared storage between
the SN and the compute nodes is accomplished if GPFS is added to the SN.
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Chapter 2. Application integration