Tuning BAP System Parameters (Alpha Upgrade Only)

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Tuning BAP System Parameters (Alpha Upgrade Only)

OpenVMS Alpha Version 7.1 and later contains system parameters that control the operation of bus-addressable pool (BAP).

The CIPCA, CIXCD, KFMSB, and Qlogic ISP 1020 (KZPSM-AA) adapters are some of the adapters that use bus-addressable pool to improve performance. BAP is a non-paged dynamic, physical-address-filtered memory pool used to overcome I/O bus and 32-bit adapter physical addressing limits.

The following table lists the BAP system parameters and their default values:

System Parameter Default Value

NPAG_BAP_MIN
0

NPAG_BAP_MAX
0

NPAG_BAP_MIN_PA
0

NPAG_BAP_MAX_PA
-1

System Parameter	Default Value
NPAG_BAP_MIN	0
NPAG_BAP_MAX	0
NPAG_BAP_MIN_PA	0
NPAG_BAP_MAX_PA	-1

The default values of these parameters allow the system to boot with any configuration. When AUTOGEN is run on a configured system, it resets these parameters to values that should enhance performance for the current system configuration.

If this is an upgrade of OpenVMS, or if the system fails to boot after a hardware change and displays a message that refers to incorrect BAP parameters, HP recommends that you perform the following steps:

To begin the conversational boot, use the BOOT command in the following format:

BOOT -FLAGS 0,1 [device-name]

For device-name, substitute the device name of your system disk drive from which you want to boot. For example, if the system disk has a device name of DKA400, enter the following command and press Return:
```
>>> BOOT -FLAGS 0,1 DKA400
```

At the SYSBOOT> prompt, type in the following:

NPAG_BAP_MIN 0
NPAG_BAP_MAX 0
NPAG_BAP_MIN_PA 0
NPAG_BAP_MAX_PA -1

This should allow the system to boot. Once completed, enter the following command:
```
$ RUN SYS$SYSTEM:AGEN$FEEDBACK.EXE
```

The command entered in the preceding step creates a file that will contain the BAP values for the system in its current configuration. To see what they are, enter the following command (the BAP parameters in AGEN$FEEDBACK.DAT do not include the NPAG_ prefix):
```
$ SEARCH SYS$SYSTEM:AGEN$FEEDBACK.DAT BAP
```

Check MODPARAMS.DAT for any hardcoded BAP values by entering the following command:

$ SEARCH SYS$SYSTEM:MODPARAMS.DAT BAP

If any BAP parameters are defined in MODPARAMS.DAT, HP strongly recommends removing them. Their presence in MODPARAMS.DAT could be the source of the current boot problem or might be a source of one in the future if a change is made to the adapter card configuration in the system.

Run AUTOGEN by entering the following command:

$ @SYS$UPDATE:AUTOGEN GETDATA TESTFILES NOFEEDBACK

After AUTOGEN completes, display or print the SYS$SYSTEM:AGEN$PARAMS.REPORT file and review it. This file lists changes being made to SYSGEN parameters or changes that AUTOGEN wanted to make but could not because of a hardcoded or minimum value that was specified in MODPARAMS.DAT.

If other changes need to be made to MODPARAMS.DAT based on a review of the AGEN$PARAMS.REPORT file, make them now and then resume at step 6.

Once you are satisfied with the parameter settings, enter the following AUTOGEN command:
```
$ @SYS$UPDATE:AUTOGEN GENPARAMS SETPARAMS NOFEEDBACK
```
This command makes the parameter changes permanent so that they are used on subsequent reboots.

Reboot the system by entering the following command:
```
$ @SYS$SYSTEM:SHUTDOWN
```

If you make changes to adapters in the future and the system boots successfully, immediately run AUTOGEN, using the following command:

$ @SYS$UPDATE:AUTOGEN GETDATA SETPARAMS NOFEEDBACK

Set System Parameters for Volume Shadowing (New Installations...

Forming the Shadow Set