Quick Beginnings

Step 2. Updating Kernel Configuration Parameters

Depending on your workstation's operating system and its kernel configuration, you may have to update the kernel configuration parameters.

This step is not required on AIX.

Recommended Values for HP-UX

The values in Table 9 are recommended for the HP-UX kernel configuration parameters.

Table 9. HP-UX Kernel Configuration Parameters (Recommended Values)

Kernel Parameter	Physical Memory
	64MB - 128MB	128MB - 256MB	256MB+
maxuprc maxfiles nproc nflocks ninode nfile msgseg msgmnb msgmax msgtql msgmap msgmni msgssz semmni semmap semmns semmnu shmmax shmseg shmmni	256 256 512 2048 512 (4 * ninode) 8192 65535 (1) 65535 (1) 128 130 128 16 128 130 256 256 67108864 16 300	384 256 768 4096 1024 (4 * ninode) 16384 65535 (1) 65535 (1) 256 258 256 16 256 258 512 512 134217728 (2) 16 300	512 256 1024 8192 2048 (4 * ninode) 32768 65535 (1) 65535 (1) 256 258 256 16 512 514 1024 1024 268435456 (2) 16 300

Notes:

1. Parameters msgmnb and msgmax must be set to 65535.

2. To maintain the interdependency among kernel parameters, change parameters in the same sequence in which they appear in the preceding table.

3. Parameter shmmax should be set to 134217728 or 90% of the physical memory (in bytes), whichever is higher. For example, if you have 196 MB of physical memory in your system, set shmmax to 184968806 (176*1024*1024).

To change the values, do the following:

1. Use SAM and select Kernel Configuration.

2. Select Configurable Parameters.

3. Highlight the parameter to be changed.

4. Select Modify Configurable Parameter from the Actions menu and make the appropriate changes.

5. Repeat the previous two steps for every kernel parameter which needs to be updated.

6. Create a new kernel by selecting Create a New Kernel from the Actions menu.

7. Reboot the system so that the changes can take effect.

To continue with the installation on HP-UX systems, proceed to "Step 3. Mounting the CD-ROM".

Recommended Values for Solaris

The values in Table 10 are recommended for Solaris kernel configuration parameters.

Table 10. Solaris Kernel Configuration Parameters (Recommended Values)

Kernel Parameter	Physical Memory
	64MB - 128MB	128MB - 256MB	256MB+
msgsys:msginfo_msgmax msgsys:msginfo_msgmnb msgsys:msginfo_msgmap msgsys:msginfo_msgmni msgsys:msginfo_msgssz msgsys:msginfo_msgtql msgsys:msginfo_msgseg shmsys:shminfo_shmmax shmsys:shminfo_shmseg shmsys:shminfo_shmmni semsys:seminfo_semmni semsys:seminfo_semmap semsys:seminfo_semmns semsys:seminfo_semmnu	65535 (1) 65535 (1) 130 128 16 128 8192 67108864 16 300 128 130 256 256	65535 (1) 65535 (1) 258 256 16 256 16384 134217728 (2) 16 300 256 258 512 512	65535 (1) 65535 (1) 258 256 16 256 32768 268435456 (2) 16 300 512 514 1024 1024

Notes:

1. Parameters msgsys:msginfo_msgmnb and msgsys:msginfo_msgmax must be set to 65535.

2. Parameters shmsys:shminfo_shmmax should be set to 134217728 or 90% of the physical memory (in bytes), whichever is higher. For example, if you have 196 MB of physical memory in your system, set the shmsys:shminfo_shmmax 184968806 (176*1024*1024).

To set a kernel parameter, add a line at the end of the /etc/system file as follows:

   set parameter-name = value

For example, to set the value of parameter msgsys:msginfo_msgmax, add the following line to the end of the /etc/system file:

   set msgsys:msginfo_msgmax = 65535

Sample files for updating the kernel configuration parameters are provided in the /opt/IBMdb2/V5.0/cfg directory. The names for these files are as follows:

• kernel.param.64MB for systems with 64MB-124MB of physical memory
• kernel.param.128MB for systems with 128MB-256MB of physical memory
• kernel.param.256MB for systems with more than 256MB of physical memory

Depending upon the amount of physical memory in your system, append the appropriate kernel configuration parameter file to the /etc/system file. If necessary, change the value of shmsys:shminfo_shmmax as described in Note 2 above.

After updating the /etc/system file, reboot the system.

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