IBM RS/6000 SP, Problem Determination Manual

Page: 35 / 316

This soft copy for use by IBM employees only.
2.2.8 Tunable Values
After the initial installation of RS/6000 SP system, the network tunable values are
set to AIX 4.1 defaults. Change these values to the optimum values for SP
systems. This is achieved by setting
no -o commands in tuning.cust file under
tftpboot directory. When the Control Workstation is rebooted, rc.sp script will
check for the existence of /tftpboot/tuning.cust file and run it if it exists. Refer to
2.11, “Node Customization Problems” on page 69 for details of post-installation
customization steps.
Note: /etc/rc.sp does not exist yet. It will be created after the installation of
PSSP software.
2.2.9 /spdata Directory Structure
You need to create a filesystem for SP data. You may create this filesystem
under
rootvg or another volume group. IBM recommends a separate volume
group for this purpose. Here are some simple reasons for this recommendation:
•
Independence from root volume group
•
Speedy mksysb of the rootvg
• Performance
•
Ease of managing programs and data in separate volume groups
Figure 12 shows the directory structure of
/spdata filesystem.
Figure 12. /spdata Directory Structure
Chapter 2. The Installation Process
15