Kernel Parameter Reference
Kernel parameters do not apply to RS/6000 machines running AIX.
In Solaris 10 several of the following parameters became obsolete.
It is important that you understand these kernel parameters before you change them. Make sure they do not conflict with other system parameters. If you need help with implementing these kernel changes, see the user manual for your platform or consult your platform system manufacturer.
maxfsiz (ULIMIT)
The maxfsiz parameter does not apply to HP/9000 users.
The maxfsiz parameter reflects the maximum size of a physical file that you can create or expand on your disk. You must know your anticipated user file sizes (for print files, work files, database reorganization files, and others) to set this parameter correctly. You also must know the largest file size you can expect on your machine. Although it is critical to have the parameter set up correctly for your current file size requirements, you can adjust this parameter at a later date if your requirements change.
On some UNIX-based operating systems, the ULIMIT parameter is separate from, and in addition to, the maxfsiz kernel parameter. ULIMIT works similarly to the maxfsiz parameter and is set in addition to, and not in place of, the maxfsiz kernel parameter.
The minimum size for ULIMIT is 40,960, 512-byte blocks, or 20 MB default for ULIMIT. Adjust this value on your own site. It probably should be considerably larger and should never be lower than the default size. This example illustrates how and where the additional ULIMIT parameter can reside. For complete information, see the system administration manual for your platform.
In the file named /etc/default/login, add or update the following parameter. (Log on as root.)
ULIMIT= 40960(ULIMIT)msgmax (MSGMAX)
The msgmax parameter defines the maximum size of a message. Lawson requires a minimum default size of 4096 for this parameter.
msgmnb (MSGMNB)
The msgmnb parameter defines the maximum size of a message queue. Lawson requires a minimum default size of 300 for this parameter.
maxdsize (MAXDSIZE)
This parameter applies only to HP/UX 11i users.
The maxdsize parameter defines the maximum size of a data segment for an executing process. Lawson requires a minimum of 320 MB for this parameter.
msgmni (MSGMNI)
The msgmni parameter defines the maximum number of message queues. The recommended value is based on the parameters in the database configuration file (ladb.cfg):
(FILES/LFILES) + FOREIGN + USERS + 25
The USERS parameter sets the maximum number of CPU processes allowed to access Lawson (approximately four for each concurrent login).
semmns (SEMMNS), semmnu (SEMMNU), semmsl (SEMMSL)
The SEMMSL parameter does not apply to HP/9000 users.
SEMMNS defines the number of semaphores system-wide.
SEMMNU defines the number of undo structures system-wide.
SEMMSL defines the number of semaphores in a set.
The USERS parameter in the database server configuration file (ladb.cfg) sets the maximum number of CPU processes, approximately four for each concurrent login, allowed to access the Enterprise Server.
To increase the USERS parameter or to increase the number of engines (ladb, RDBMS) being used, reset these kernel parameters using the following guidelines.
SEMMNS = USERS * Number of engines or servers + 25
SEMMNU = SEMMNS
SEMMSL = SEMMNS
Lawson requires a minimum of 75 for these parameters.
shmmax (SHMMAX)
The shmmax parameter defines the maximum size of a shared memory segment. The recommended value is:
SHMMAX = USERS * 10,000
Lawson requires a minimum of 480,000 for this parameter.
shmmin (SHMMIN)
This parameter applies only to the Sun Solaris operating system.
The shmmin parameter defines the minimum size of a shared memory segment. For the Sun Solaris operating system, both the shmmax and shmmin parameters must be set.
Lawson recommends a minimum value of 100 for this parameter.
maxuproc or maxuprc
The maxuproc or maxuprc parameter defines the maximum number of processes for a user. At a minimum, set this parameter to 160. Larger sites might need to use a higher number.
maxfiles
The maxfiles parameter defines the number of files a process can use. You might need to adjust this parameter depending on your requirements.
msgtql
This parameter defines the maximum number of active message queues. On busy systems, if this parameter is set too low, Lawson might appear to hang. At a minimum, set msgtql to 160. Larger sites might need to use a higher number, such as 256.
nproc
The nproc parameter defines the maximum number of processes system-wide. You might need to adjust this parameter depending on your requirements.
nfiles
The nfiles parameter defines the maximum number of files open at one time system-wide. You might need to adjust this parameter depending on your requirements.