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the PCI-X Dual Channel Ultra320 SCSI Adapter using the ipr Device Driver" on page 15 to ensure that the
PCI-X Dual Channel Ultra320 SCSI Adapter is installed correctly. Then return to this section, and repeat
this hardware installation procedure.
Updating Hard Disk Drive and Adapter Microcode
Disk drives attached to this adapter must contain the latest microcode level.
Microcode updates for hard disk drives attached to the PCI-X Dual Channel Ultra320 SCSI Adapter are
handled automatically by the sisupdate utility, which executes each time the system is booted.
The latest microcode level for your drive model and PCI-X Dual Channel Ultra320 SCSI Adapter is shipped
as part of the Linux distribution. If an update or replacement is needed, the latest microcode can be
obtained from your Linux distributor, or found as part of the device driver package at the following Web
site: http://www6.software.ibm.com/dl/linuxsdd/linuxsdd-p.
If you downloaded new microcode from the Web site, install it as follows:
1. If necessary, log in as root user.
2. Untar the package, type:
tar –xzvf ibmsis-$ver.tgz
Press Enter.
3. Change directories to ibmsis/obj/firmware/. Type:
cd ibmsis/obj/firmware/
4. Install the microcode. Type:
make install
5. Update the microcode. Type:
sisupdate
Press Enter.
Configuring the PCI-X Dual Channel Ultra320 SCSI Adapter
The PCI-X Dual Channel Ultra320 SCSI Adapter permits up to 320 MB/s operation with LVD devices on a
wide bus. With single-end (SE) devices, it can run up to 40 MB/s. The maximum speed and bus width are
automatically negotiated based on the characteristics of the attached device.
You can use the sisconfig utility to control speed and bus width for devices as described in the following
sections.
Limit Adapter Speed Using the Maximum SCSI Bus Speed in MB/s
The default maximum adapter speed is 320 MB/s for LVD mode and 40 MB/s for SE mode. If you are not
successful running at these speeds, you can reduce the adapter speed by changing the Maximum SCSI
Bus Throughput.
Note: The device driver will default to 80 MB/s until the sisconfig utility is run. After the sisconfig utility
completes, higher speeds will be attempted. The sisconfig utility is configured to run automatically
each time the system is booted.
To limit adapter speed, do the following:
1. At the command prompt, type sisupdate, and press Enter.
2. Select Work with configuration and press Enter.
3. Select Work with SCSI bus configuration and press Enter.
4. Select your adapter from the list by pressing 1, then press Enter.
24
PCI-X Dual Channel Ultra320 SCSI Adapter Installation and Using Guide
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