User guide

3–InfiniBand
®
Cluster Setup and Administration
Managing the ib_qib Driver
IB0054606-02 A 3-21
Managing the ib_qib Driver
The startup script for ib_qib is installed automatically as part of the software
installation, and normally does not need to be changed. It runs as a system
service.
The primary configuration file for the IB driver ib_qib and other modules and
associated daemons is
/etc/infiniband/openib.conf.
Normally, this configuration file is set up correctly at installation and the drivers are
loaded automatically during system boot once the software has been installed.
However, the ib_qib driver has several configuration variables that set reserved
buffers for the software, define events to create trace records, and set the debug
level.
If you are upgrading, your existing configuration files will not be overwritten.
NOTE
To use 4K MTU, set the switch to have the same 4K default. If you are using
QLogic switches, the following applies:
 For the Externally Managed 9024, use 4.2.2.0.3 firmware
(
9024DDR4KMTU_firmware.emfw) for the 9024 EM. This has the 4K MTU
default, for use on fabrics where 4K MTU is required. If 4K MTU support
is not required, then use the
4.2.2.0.2 DDR *.emfw file for DDR
externally-managed switches. Use FastFabric (FF) to load the firmware
on all the 9024s on the fabric.
 For the 9000 chassis, use the most recent 9000 code 4.2.4.0.1. The 4K
MTU support is in 9000 chassis version 4.2.1.0.2 and later. For the 9000
chassis, when the FastFabric 4.3 (or later) chassis setup tool is used,
the user is asked to select an MTU. FastFabric can then set that MTU in
all the 9000 internally managed switches. The change will take effect on
the next reboot. Alternatively, for the internally managed 9000s, the
ismChassisSetMtu Command Line Interface (CLI) command can be
used. This should be executed on every switch and both hemispheres of
the 9240s.
 For the 12000 switches, refer to the QLogic FastFabric User Guide for
externally managed switches, and to the QLogic FastFabric CLI
Reference Guide for the internally managed switches.
For reference, see the QLogic FastFabric User Guide and the QLogic 12000
CLI Reference Guide. Both are available from the QLogic web site.
For other switches, see the vendors’ documentation.