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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.
  • 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.

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