Modifying kernel parameters and user limits (AIX Linux)
IBM® InfoSphere® Information Server requires specific resources for each tier. Modify the kernel parameters and user limits, and restart the computer before you start the installation program.
The kernel parameter and user limit requirements are minimum requirements for InfoSphere Information Server. The optimal value for each parameter might be higher depending on your topology and the operational data load. Additional kernel parameter and user limit changes might be required. When more than one value is provided for your configuration, use the largest minimum value.
All changes must be made by a trained system administrator. Make a backup copy of the kernel parameters and user limits before you modify them. After you modify the kernel parameters and user limits with the suggested values, restart the computer, and then install InfoSphere Information Server.
Minimum kernel parameters
You might need to configure the kernel parameters and user limits for your application server. For more information, refer to the IBM WebSphere® Application Server documentation.
Minimum kernel parameter values for IBM DB2 databases
The minimum metadata repository kernel parameter requirements apply only to DB2® database installations. Before you install DB2 as part of InfoSphere Information Server, ensure that your computer meets the following minimum requirements for kernel parameter for DB2:
- AIX®: The default kernel parameter values are sufficient.
- Linux®:
The minimum Linux kernel parameter
values are described in the following table:
Table 1. Minimum Linux kernel parameters and user limits for the metadata repository computer on DB2 Parameter Value MSGMAX 65536* MSGMNB 65536* MSGMNI 1024 RANDOMIZE_VA_SPACE 0 SEMMNI 1024 SEMMNS 256000 SEMMSL 250 SEMOPM 32 SHMALL - For the default 4096 PAGE_SIZE, use 4294967296
- For a PAGE_SIZE larger than 4096, divide 17592186044416 by PAGE_SIZE (17592186044416/PAGE_SIZE)
SHMMAX Set this value to be equal to 100% of the physical memory (in bytes) on your computer.
SHMMNI 4096
* Required by DB2.
When the DB2 kernel requirements are different from the InfoSphere Information Server kernel parameter requirements, use the largest minimum value. If you use a different database system for the metadata repository, consult the product documentation for that database system to find information about kernel parameter requirements.
Minimum AIX kernel parameters
Run
the smit
or smitty
command
to modify kernel parameters on AIX.
The following table contains the minimum kernel parameters and user
limits for the engine and services tiers.
Parameter | Engine and services tiers |
---|---|
MAXUPROC | 4096 or unlimited |
NOFILES | 10240 |
Minimum Linux kernel parameters
The following table contains the minimum kernel parameters and user limits for the engine and services tiers.
Parameter | Engine and services tiers |
---|---|
MSGMAX | 8192 |
MSGMNB | 16384 |
MSGMNI | No requirement |
SEMMNI | 1024 |
SEMMNS | 128000 |
SEMMSL | 250 |
SEMOPM | 32 |
SHMALL | 2511724800 Use the smaller value of 837241600 if the following conditions apply:
|
SHMMAX | 307200000 |
SHMMNI | 2000 |
nproc | 1000 or unlimited |
nofile | 10240 |