Informix Machine Notes

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                      =================================
                            MACHINE SPECIFIC NOTES
                                    FOR
             IBM Informix Database Server 14.10.FC9 PRODUCT RELEASE
			       On Linux zSeries
                               DATE: 03 Oct 2022
                      =================================

OS Information : Built on Red Hat Enterprise Linux ES release 7.4 (Maipo).

System Requirements
===================

1.  This product was built on Red Hat Enterprise Linux ES release 7.4
    for zSeries mainframe with 64-bit Kernel  3.10.0-957.21.3.el7 and glibc
    glibc 2.17-307, using the following compilers:

       gcc version 4.8.5 20150623 (Red Hat 4.8.5-39)

    The following packages have to be installed on your Linux system:

        libaio-0.3.109
        libgcc-4.8.5
        libstdc++-6.0.19
        ncurses-5.9
        pam-1.1.8
	elfutils-libelf-0.176

    This product has been certified on:

        - SUSE SLES 12.3 (Kernel: 4.4.73-51, Glibc: 2.22-61). The following
          packages have to be installed:

          libaio-0.3.109
          libgcc_s1-6.2.1
          libstdc++6-6.2.1
          ncurses-utils-5.9-40
          pam-1.1.8-23
          libelf1-0.158-6

2.  The UNIX graphical tools ipload, onperf and xtree only require
    OpenMotif runtime libraries version 2.3.x. The minimum version is
    2.3.1, i.e. openmotif-2.3.1-2.el5.

3.  The Korn shell is required for the Informix server alarmprogram
    scripts. Install it as /bin/ksh.

4.  If a suitable library libaio.so.1 is found, IBM Informix Database Server
    enables Kernel Asynchronous I/O (KAIO) automatically. Otherwise KAIO is
    disabled.

5.  The High Performance Loader utilities, onpload, ipload and onpladm, require
    a minimum of 35 MB of memory and 70 MB of swap space in order to run.

6.  IBM Informix Database Server uses the libraries and utilities provided by
    the IBM Global Security Kit (GSKit) for data encryption and Secure Sockets
    Layer (SSL) communication. The GSKit is bundled with the server and will
    be installed on your machine as part of the server installation process.

    Here are more details on the GSKit:

       a. The GSKit is also bundled with other IBM products and might
          already be present on your machine. If GSKit is not installed,
          Informix server will install GSKit in /usr/local/ibm/gsk8_64
          directory on your machine.

       b. The GSKit installation directory must have 30 MB of free disk space.

       c. One of the following packages must be installed on your system:
          RHEL 5 - compat-libstdc++-33-3.2.3-61 or later

       d. The RPM Package Manager is required to be installed on the system.

Check the following web site for the latest Linux system requirements
for IBM Informix Database Server:

    http://www-01.ibm.com/support/docview.wss?rs=630&uid=swg27013343


System Configuration
====================

1.  Kernel Parameters

    The values of the kernel parameters that were used for testing this
    product are given below. These values might need to be tuned depending
    on the application and availability of system resources. They can either
    be dynamically changed in the /proc file system or are defined in the
    kernel sources and can be changed by rebuilding the kernel.

    SHMMAX:   4398046511104
    SHMMNI:   128
    SHMALL:   4194304
    SEMMNI:   128
    SEMMSL:   250
    SEMMNS:   32000
    SEMOPM:   32

    - The value of the kernel parameter "SEMMSL" should be set to at least
      100. This is the maximum number of semaphores per set.

2.  Location of Shared Memory

    The ONCONFIG variable SHMBASE should be set to the following:

        SHMBASE 0x100000000L


Feature Notes  (alphabetized by feature)
=============

1.  High Performance Loader

    User-defined conversion routines must be provided in a dynamic, shared
    64-bit library called ipldd11a.so. This library is installed in the
    $INFORMIXDIR/lib directory. You can set the location of this file with
    the HPL_DYNAMIC_LIB_PATH configuration parameter in file pointed to by
    PLCONFIG environment variable. For more details, refer the manual
    "High-Performance Loader User's Guide".

    The following two environment variables are required to be set as:

        PLOAD_SHMBASE=0x000004000000000
        IFX_XFER_SHMBASE=0x000005000000000

    Onpload will use shared memory during its execution. It will allocate
    memory beyond the address for the server, leaving room for server shared
    memory expansion.

2.  IPv6 Support

    The Informix database server supports Internet Protocol Version 6 (128 Bit
    Internet Addresses) as well as IPv4 (32 Bit Addresses).

    In order for the machine name that is specified in the SQLHOSTS file to
    resolve to the correct IP address, the name services files on the operating
    system must be configured correctly. If the machine has an IPv6 address
    configured, and the listener thread is bound to an IPv6 address, then the
    name service switch files /etc/nsswitch.conf must be configured to fetch
    an IPv6 address. Also any local machine settings must be set correctly in
    the /etc/hosts file.

    For compatibility with earlier version of Informix client and server
    products, assign each host name with both an IPv4 address and an IPv6
    address. If the listener needs to be bound to an IPv4 address, and the
    name services resolve the name in the order of the IPv6 address followed
    by the IPv4 address, then an explicit IPv4 address needs to be put in the
    host name field of SQLHOSTS file. Client applications should also use the
    same setting.

3.  Kernel Asynchronous I/O (KAIO)

    KAIO is enabled by default on this platform. It can be disabled by setting
    the environment variable KAIOOFF=1 in the environment of the process that
    starting the server.

    When using KAIO, it is recommended to run poll threads on separate VPs by
    specifying NET as VP class in the NETTYPE onconfig parameter, e.g.
    NETTYPE ipcshm,...,...,NET or
    NETTYPE soctcp,...,...,NET

    On Linux, there is a system wide limit of the maximum number of parallel
    KAIO requests. The file /proc/sys/fs/aio-max-nr is containing this value.
    It can be increased by the Linux system administrator, e.g. by

    # echo new_value > /proc/sys/fs/aio-max-nr

    The current number of allocated requests of all OS processes is visible
    in /proc/sys/fs/aio-nr.

    By default, IBM Informix Database server is allocating half of the maximum
    number of requests, and assigns them equally to the number of configured
    CPU VPs. The number of requests allocated per CPU VP can be controlled by
    the environment variable KAIOON, by setting it to the required value before
    bringing up the server. The minimum value for KAIOON is 100. If Linux is
    about to run out of KAIO resources, e.g. when dynamically adding many CPU
    VPs, warnings will be printed to the online.log file. In this case, the
    Linux system administrator should add KAIO resources as described above.
    Note that the libaio.so library is required, regardless of the distribution
    or kernel level.

4.  Large Memory Addressability (LMA)

    IBM Informix LMA provides the ability to support system configurations
    with greater than 4GB of RAM. Most UNIX systems are limited to 4GB of
    RAM based on the memory addressing limitations of 32-bit architectures.

    The values for the following ONCONFIG parameters are increased from
    32-bit to 64-bit platform by LMA support:

        - The maximum number of buffers in BUFFERPOOL is 2147483647.

        - The maximum of LRU queues for lrus field in BUFFERPOOL is 512.

        - The DS_TOTAL_MEMORY, which is the total memory available for
          decision support memory, is only limited by the amount of virtual
          memory available. The sort memory comes out of the DS_TOTAL_MEMORY
          memory and hence there is no explicit limit on the amount of sort
          memory.

        - The read ahead parameter RA_PAGES is only limited by the number of
          buffers and therefore can be any value less than 2147483647. The
          "chunk" write algorithm is not dependent on the amount of buffers or
          shared memory and can write as many pages in a single I/O as possible.

        - The maximum size of any shared memory segment is 4398046511104 bytes.

        - The value for SHMADD is 4294967296 kilobytes.

    Refer to IBM Informix Administrator's Reference manual for the
    information about the related configuration parameters setting.

5.  MQ Messaging Database Extension

    The MQ extension provides mechanism for data exchange between
    Informix server and queues managed by Websphere MQ.

    Note: MQ Messaging Extension expects Websphere MQ libraries installed in
          the default location /opt/mqm. Otherwise create symbolic links
          from /opt/mqm/lib64 to the 64-bit Websphere MQ libraries.

6.  Network Protocols

    The following protocols and interfaces are supported on this platform:

       SOCKETS using TCP/IP
       IPC using stream pipe (implemented using UNIX Domain Sockets)

    To use SOCKETS with TCP/IP:

       a. The NETTYPE entry in the ONCONFIG file and the nettype field in
          the sqlhosts file entry must contain "onsoctcp".

       b. To enable an IBM Data Server Client to connect to the database
          Server, the NETTYPE entry in the ONCONFIG file and the protocal
          value in the sqlhosts file entry must contain "drsoctcp"

          If a CLI or JCC client wants to connect to the database server
          through DRDA while supporting SQLI connections, you must add a
          DBSERVERALIASES entry to the ONCONFIG file that corresponds to
          the sqlhosts file entry.

    To use IPC (interprocess communication) with stream pipe:

        a.  The NETTYPE entry in the ONCONFIG file and the nettype field in
            the sqlhosts file entry must contain "onipcstr".

    Fast poll is supported with TCP/IP and stream pipe interfaces. To disable
    fast poll, set the FASTPOLL parameter to 0 in the ONCONFIG file. By default
    the fast poll is enabled (value is 1).

    Remote 32-bit applications and tools (example: ESQL/C, 4GL, ISQL) can
    only connect to the IBM Informix Database Server using the TCP/IP
    protocol.

    Local 32-bit applications and tools can connect to the 64-bit server
    using either the TCP/IP sockets or the IPC stream pipe protocols.

    The protocol for supporting IBM Informix MaxConnect on this platform
    is "onsocimc".

7.  Online Backup and Restore (ON-Bar)

    ON-Bar uses the XBSA interface. Some of the functions invoked by ON-Bar
    are in a shared library supplied by third party storage management vendors.
    For ON-Bar to access the functions, set the BAR_BSALIB_PATH parameter in
    $INFORMIXDIR/etc/$ONCONFIG to the full pathname of the library.

    Using $INFORMIXDIR/lib/ibsad001.so as a symbolic link to the library is
    deprecated and shall be discontinued.

    Informix Interface for Tivoli Storage Manager (TSM) is supported on this
    platform. The interface is built with TSM API version 5.3.2.

8.  Optical

    As of 2020-04-10, even the stubs of support for OnLine/Optical are gone.

9.  Pluggable Authentication Module (PAM)

    PAM functionality is supported on Linux operating systems. PAM requires
    the libpam.so library that is supplied by the Operating System vendor.

    Use of PAM can be enabled or disabled by the system administrator. By
    default, the Informix server will use the traditional authentication
    mechanism to avoid changes for the users.

    The PAM service identifies the PAM module. This PAM module usually is
    located in /usr/lib/security and its parameters are listed in
    /etc/pam.conf.

10.  Processor Affinity

    The processor affinity feature, which allows the pinning of a CPU
    virtual processor to a physical processor in a multi-CPU configuration,
    is supported on this platform.

11. Secure Sockets Layer

    IBM Informix Database Server uses the libraries and utilities provided by
    the IBM Global Security Kit (GSKit) for Secure Sockets Layer (SSL)
    communication.

       a. Before uninstalling GSKit, verify that it is not needed on your
          system. It is possible that software other than Informix Database
          Server requires GSKit. Uninstall by identifying and removing GSKit
          packages using the command-line interface:

          Run rpm command with the -qa option to obtain a list of installed
          GSKit packages with their exact names.
          For example:
          rpm -qa | grep gsk

          As root user run the rpm command to remove each package as needed.
          For example:
          rpm -ev gskssl64-8.0.55.26 gskcrypt64-8.0.55.26

       b. If you want to restore Secure Sockets Layer capability after you
          have uninstalled GSKit, see the readme file in $INFORMIXDIR/gskit
          for how to install GSKit.

12. Simple Password Communications Support Module

    The name of the IBM Informix shared library for Simple Password CSM
    on Linux is libixspw.so.


Features not supported
======================

1.  Rolling upgrades to IDS version 14.10.xC2 and 14.10.xC6 are not supported.

    Rolling upgrades are not supported in IDS version 14.10.xC2 and 14.10.xC6.
    Migration to these versions from a previous version require changes to
    disk structures, and the conversion process is incompatible with a rolling
    upgrade. When upgrading HDR and RSS secondary servers to version 14.10.xC2
    or 14.10.xC6, you must follow the steps listed in the on-line documentation
    under "Migrating an offline cluster to a new major version."

2.  J/Foundation

3.  OnSNMP

4.  Spatiotemporal Search Database Extension

5.  Web Feature Service Database Extension

6.  XML Publishing

7.  Support for Communication Support Module (CSM) is removed starting
    Informix Server 14.10.xC9 . You should use Secure Sockets Layer
    (SSL)/Transport Layer Security (TLS) instead.

Defects Fixed in this release
=============================

For information about defects fixed in this release, see:
http://www.ibm.com/support/docview.wss?uid=ibm10870226


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(C) Copyright HCL Technologies Ltd. 2017, 2022. All Rights Reserved.