QLogic OFED+ Host Software User Guide, Rev. B

3–TrueScale Cluster Setup and Administration
Performance Settings and Management Tips
• Allocate all chip resources to a single port on a dual port card. The
singleport parameter, when set to a non-zero value at driver load, will cause
dual port Truescale cards to act as single port cards, with only infiniband port
1 enabled. The board identification string is not affected (that is, a QLE7342
with singleport set will still be identified as a QLE7342, not a QLE7340). The
default value of this parameter is 0, however it may be set to 1 during the
IFS installation process
By default, in the QLogic Installation TUI will configure a dual-port card so all
chip resources are directed to port1 to maximize performance. This also
saves power by not enabling the second port. If you want to utilize both ports
specify when asked about single port to use dual ports.
Remove Unneeded Services
The cluster administrator can enhance application performance by minimizing the
set of system services running on the compute nodes. Since these are presumed
to be specialized computing appliances, they do not need many of the service
daemons normally running on a general Linux computer.
Following are several groups constituting a minimal necessary set of services.
These are all services controlled by chkconfig. To see the list of services that are
enabled, use the command:
$ /sbin/chkconfig --list | grep -w on
Basic network services are:
• network
• ntpd
• syslog
• xinetd
• sshd
For system housekeeping, use:
• anacron
• atd
• crond
If you are using Network File System (NFS) or yellow pages (yp) passwords:
• rpcidmapd
• ypbind
• portmap
• nfs
• nfslock
• autofs
To watch for disk problems, use:
3-28 D000046-005 B