HP SCSI Host Bus Adapters User Manual download pdf (Page 45)

4 HP A7173A Administration and Management

This chapter contains the following sections detailing A7173A adapter Administration and

Management tasks:

• “Performance Tuning” (page 45)

• “Online Replacement of the A7173A Adapter” (page 45)

• “Verify or Update A7173A Adapter Firmware On HP 9000 Systems” (page 46)

• “Verify or Update A7173A Adapter Firmware on HP Integrity Systems” (page 46)

• “Using mptutil to Verify or Update A7173A Adapter Firmware” (page 46)

Performance Tuning

To get the best performance from the A7173A adapter, HP recommends the following:

• Increase the number specified for the maximum queue depth:

— HP-UX 11i v1, 11i v2: The scsi_max_qdepth tunable is dynamic, so no system reboot

is needed to change the parameter’s value. See “SCSI Queue Depth Management” in

the HP-UX 11i Release Notes for more information about this tunable. If you see “queue

full” messages in the /var/adm/syslog.log file, you can avoid those messages by

reducing the value for scsi_max_qdepth.

— HP-UX 11i v3: The scsi_max_qdepth tunable has been obsoleted and replaced with

the max_q_depth tunable starting with HP-UX 11i v3. The max_q_depth tunable is

dynamic, so no system reboot is needed to change the parameter’s value. You can use

the scsimgr command to set this value at a global level (such as for all disk devices);

for a set of devices (such as for all disk devices from HP); or for a single device (such

as for disk0). See the scsimgr (1M) manpage for details.

• Install the A7173A adapter in a PCI-X, 133 MHz, 64 bit, 4x (“Twin Turbo” or “Dual Rope”)

slot.

• Do not connect any Single Ended (SE) SCSI devices on the same SCSI bus with Low Voltage

Differential (LVD) SCSI devices. This limits the maximum bus speed to Ultra SCSI (40 MB/s).

See “Important Rules For Connecting SCSI Devices” (page 17).

• When you assign SCSI IDs to SCSI devices on the bus, assign the highest priority SCSI IDs

to the devices with the highest volume of data transfer; see “About SCSI IDs” (page 24).

• Set the A7173A adapter’s maximum data transfer rate to the optimal setting for your

configuration; see “About the Maximum Data Transfer Rate” (page 24).

• Make sure you have the correct SCSI hardware configuration. Domain Validation can detect

some configuration problems; see “Domain Validation” (page 53).

Online Replacement of the A7173A Adapter

Online Addition and Replacement (OLAR for HP-UX 11i v1, or OL* for HP-UX 11i v2 and later

HP-UX releases) enables you to add, replace, or delete a PCI host bus adapter in an HP-UX system

without shutting down or rebooting the system, and without adversely affecting other system

components. The system hardware uses slot-specific power control combined with HP-UX

operating system support to enable this feature. For more information, see “Online Installation”

(page 16).

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HP SCSI Host Bus Adapters User Manual Page 45