SOS System Configuration Summary

The System Configuration Screen

The System Configuration screen displays various configurable kernel parameters. Figure 24.1 shows an example of the screen.

Figure 24.1 SOS System Configuration screen

To access the System Configuration screen from any SOS display screen:

Type s from the SOS Enter command: prompt to view the Screen Selection Menu screen.

From the Screen Selection Menu screen, enter y (System Configuration). The System Configuration screen will display.

System Configuration Screen Display Items

SYSTEM CONFIGURATION

The SYSTEM CONFIGURATION portion of the System Configuration screen displays system configuration parameters.

Table 24.1 SOS SYSTEM CONFIGURAITON data items

Data Item	Description
system name	The specific name of the system assigned during the system installation.
serial num	The serial number of the system.
os version	The version of the operating system.
cpu type	The type of CPU hardware and model.
boot time	The time of the last system reboot.
run level	The Unix state of operation. For information about run levels, please refer to the "inittab" Unix man page.

MEMORY MANAGEMENT CONFIG

The MEMORY MANAGEMENT CONFIG portion of the System Configuration screen displays memory management parameters.

Table 24.2 SOS MEMORY MANAGEMENT data items

Data Item	Description
lotsfree	The upper bound for paging (see "lotsfree").
desfree	The lower bound for paging (see "desfree").
minfree	The threshold value at which the system considers itself to be out of memory (see "minfree").
umem	The amount of unlockable memory configured (see "unlockable memory").
page size	The page size data item represents the size of the pages (bytes).

FS CONFIGURATION

The FS CONFIGURATION portion of the System Configuration screen displays information about the file system configuration.

Table 24.3 SOS FS CONFIGURATION data items

Data Item	Description
fs_async	Defines whether inodes are written asynchronously when critical fields are modified (i.e., file size). The default is 0 - inodes are written synchronously. Writing inodes asynchronously can improve performance, but can cause data integrity in the case of a system crash. It's advised to leave synchronous writes on.
nfile	The configured number of entries in the file table.
ninod	The configured number of entries in the inode cache.

SWAP CONFIGURATION

The SWAP CONFIGURATION portion of the System Configuration screen displays information about the swap configuration.

Table 24.4 SOS SWAP CONFIGURATION data items

Data Item	Description
nswapdev	The maximum number of swap devices allowed.
nswapfs	The maximum number of swap file systems allowed.

SYSV BUFFER CACHE CONFIGURATION

The SYSV BUFFER CACHE CONFIGURATION portion of the System Configuration screen displays information about the SYSV buffer cache parameters.

Table 24.5 SOS SYSV BUFFER CACHE CONFIGURATION data items

Data Item	Description
nbuf	The configured number of buffer cache headers on the system. If the DBC is configured, this number will change over time.
bufpages	The number of pages configured in the buffer cache. If the DBC is configured, this number will change over time.
dbc min	The minimum size in pages of the DBC. If a fixed size buffer cache is used, "N/A" will be displayed.
dbc max	The maximum size in pages of the DBC. If a fixed size buffer cache is used, "N/A" will be displayed.

PROCESS CONFIGURATION

The PROCESS CONFIGURATION portion of the System Configuration screen displays information about the process configuration parameters.

Table 24.6 SOS PROCESS CONFIGURATION data items

Data Item	Description
timeslice	The timeslice scheduling interval in units of clock ticks (10 milliseconds). If the value is 0, the system default is used (100 ticks). If the value is -1, round-robin scheduling is disabled. See "timeslice".
maxfiles	The soft limit on the maximum number of files a process may have open. A process may override the soft limit.
maxtsiz	The maximum size of the text segment of a process in pages.
maxuprc	The maximum number of processes allowed for a single user.
maxfiles_lim	The hard limit on the maximum number of files a process may have open. Only a process owned by root can only override the hard limit.
maxdsiz	The maximum size of the data segment of a process in pages.
nproc	The configured number of entries in the process table. This defines how many processes may run on the system at one given time.
maxssiz	The maximum size of the stack segment of a process in pages.

IPC CONFIGURATION

The IPC CONFIGURATION portion of the System Configuration screen displays information about the SYSV IPC (interprocess communication) configuration parameters.

Table 24.7 SOS IPC CONFIGURATION data items

Data Item		Description
MESSAGES	msgmax	The maximum size (bytes) of a single message.
	msgmnb	The maximum number of bytes on the message queue at one time.
	msgssz	The size (bytes) of each message segment. The message buffer cache size is calculated: Message Buffer Cache Size (bytes) = msgseg * msgssz
	msgmap	The configured number of message map entries.
	msgmni	The configured number of message queue identifiers.
	msgseg	The number of segments allocated in the message buffer cache.
	msgtql	The configured number of message headers. A message header is used for each message queued in the system.
SEMAPHORES	semmap	The configured number of SYSV semaphore map entries.
	semmni	The configured number of SYSV semaphore identifiers. A semaphore identifier may refer to multiple semaphores.
	semmns	The configured number of SYSV semaphores available.
	semvmx	The maximum value that a SYSVSYSV semaphore is allowed to reach.
	semaem	The maximum value by which a SYSV semaphore can be undone.
	semmnu	The configured number of "undo's" on system.
	semume	The maximum number of "undo's" entries per process.
SHARED MEM	shmmax	The maximum shared memory segment size (bytes).
	shmmni	The configured number of shared memory identifiers.
	shmseg	The maximum number of shared memory segments that can be attached to a process.