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Informix Machine Notes

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                            MACHINE SPECIFIC NOTES
               IBM Informix Database Server 14.10.FC8 PRODUCT RELEASE
                               On Linux x86_64
                               DATE: 05 Apr 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
    (Kernel: 3.10.0-693, Glibc: 2.17) for x86_64 compatible processors.
    The following compilers were used:

      gcc and c++ compiler 4.8.5 20150623 (Red Hat 4.8.5-16) for GLS and ICU
      gcc and c++ compiler 7.3.1 20180303 (Red Hat Devtoolset-7) for the server

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


    Please note that this version of Informix Dynamic Server does not
    support Linux environments with a kernel version lower than 3.10.0-693.

    For Informix Blade development the GNU linker may need to be
    updated to GNU ld version 2.28-11.el7 or newer.

    Update is not needed for the installation and operation of
    Informix Dynamic Server.

    This product has been certified on:

        - Red Hat Enterprise Linux ES release 8.0 (Kernel: 4.18.0-80,
          Glibc: 2.28-42). The following packages have to be installed:


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


        - SUSE SLES 15 (Kernel: 4.12.14-25, Glibc: 2.26-13). The following
	        packages have to be installed:


        - Ubuntu Server Edition 16.04 LTS (Kernel: 4.4.0-142, Glibc: 2.23).
          The following packages have to be installed:

          libgcc      5.4.0
          libstdc++6  5.4.0
          libncurses5 6.0
          libpam      1.1.8

        - Ubuntu Server Edition 17.10 (Kernel: 4.13.0-21, Glibc: 2.26).
          The following packages have to be installed:

          libgcc      7.2.0
          libstdc++6  7.2.0
          libncurses5 6.0
          libpam      1.1.8

        - Ubuntu Server Edition 18.04 LTS (Kernel: 4.15, Glibc: 2.27).
          The following packages have to be installed:

          libgcc      7.5.0
          libstdc++6  7.5.0
          libncurses5 6.1
          libpam      1.1.8

        - Ubuntu Server Edition 20.04 LTS (Kernel: 5.4.0, Glibc: 2.31).
          The following packages have to be installed:

          libgcc      10.2.0
          libstdc++6  10.2.0
          libncurses5 6.2
          libpam      1.3.1

	On Ubuntu 20.04 LTS the kernel setting 'fs.protected_regular' defaults
	to '2'. This could cause initialization errors on instances configured
	with a SHM listener. To support SHM connections this parameter needs
	to be set to '0' (e.g., 'sudo sysctl fs.protected_regular=0')

    The bc utility is required by the product installer, and needs to be
    installed on Ubuntu.

2.  The UNIX graphical tools ipload, onperf and xtree only require
    Motif runtime libraries version 2.3.x. The minimum version is
    2.3.4, i.e. motif-devel-2.3.4-14.el7_5.x86_64

3.  If a suitable library is found, Informix Dynamic Server
    enables Kernel Asynchronous I/O (KAIO) automatically. Otherwise KAIO is

4.  The Informix product installer may fail to start correctly.
    When it aborts the following two messages are displayed:

       Installer User Interface Mode Not Supported
       Unable to load and to prepare the installer in console or silent mode.

    This can happen due to a known problem in the Java Virtual Machine that
    is internal to the installer. This problem is known as
    "JDK-8188030 : AWT java apps fail to start when some minimal fonts
    are present".
    It may appear when only minimal fonts of the CFF format are installed on
    the machine.

    On a Linux system with Intel x86 64-bit architecture, this problem can be
    worked around by installing an additional font with a format different than
    CFF. For example fonts from the font package "gnu-free-mono-fonts" are
    known to allow the Informix product installer to start and operate
    correctly. This font package can be installed on RedHat distributions by
    executing the following command as user root:

       yum install gnu-free-mono-fonts

    (On different Linux distributions it may be necessary to use a different
    installation utility instead of "yum".)

5.  The Korn shell is required for the Informix server alarmprogram
    scripts. Install it as /bin/ksh. On Ubuntu Server Edition, pdksh needs
    to be installed.

6.  Informix Dynamic 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,
          the script $INFORMIXDIR/gskit/installgskit will install GSKit in
          /usr/local/ibm/gsk8_64 directory on your machine.

       b. The GSKit installation directory must have 25 MB of free disk space.

       c. The RPM or Debian Package Manager is required to be installed on the

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:   4096
    SHMALL:   4194304
    SEMMNI:   4096
    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 configuration parameter SHMBASE is set to the following:

        SHMBASE 0x44000000L

3.  Environment Variables

    It is recommended that the environment variable INFORMIXSTACKSIZE be
    set to 128 (the default is 64) if the application involves operations
    which would require the Informix Dynamic Server to perform recursive
    database tasks (for example, cascading deletes).

Feature Notes

1.  High Performance Loader

    User-defined conversion routines must be provided in a dynamic, shared
    64-bit library called 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:


    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 Dynamic 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 versions 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.  J/Foundation (Java in the Server):

    The IBM Runtime Environment, Java Technology Edition, Version 8.0
    release is installed in $INFORMIXDIR/extend/krakatoa/jre and should be
    used with the J/Foundation component.

    A Java user-defined routine (UDR) runs in a Java virtual processor. Use
    the VPCLASS configuration parameter to specify the number of virtual
    processors for the server. You configure Java virtual processors in
    the "Java configuration parameters" section of the onconfig configuration
    file. The default onconfig.std file is in the $INFORMIXDIR/etc directory.

    To develop Java UDRs for the server on this platform, use the 64-bit
    IBM SDK, Java Technology Edition, Version 8 or an earlier version
    according to Java compatibility guidelines. Java SDK 8 contains the
    latest virtual machine technology from IBM and can be downloaded from

4.  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
    starts the server.

    When using KAIO, it is recommended to run poll threads on separate VPs by
    specifying NET as VP class in the NETTYPE configuration 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, Informix Dynamic 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
    starting 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.

5.  Locking large pages in memory

    The Informix Dynamic Server can use large pages in memory when queries
    require more memory. (On Linux operating systems, large pages are called
    huge pages.) However, after you initialize Informix Dynamic Server on Linux
    operating systems, the database server is unable to lock large pages in
    memory when queries require more memory. If you want to take advantage
    of the large-page support, you must use the onmode utility to add memory
    segments, and then run the queries.

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 configuration 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 configuration file and the
          protocol 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 configuration file that corresponds to
          the sqlhosts file entry.

    To use IPC (interprocess communication) with stream pipe:

        a.  The NETTYPE entry in the configuration 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 configuration file.
    By default fast poll is enabled (value is 1).

    Remote 32-bit or 64-bit applications and tools (example: ESQL/C, 4GL, ISQL)
    can only connect to the Informix Dynamic Server using the TCP/IP

    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.

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
    the configuration file to the full pathname of the library.

    This shared library must be compiled in 64-bit mode.

    Using $INFORMIXDIR/lib/ 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.  Pluggable Authentication Module (PAM)

    PAM functionality is supported on Linux operating systems. PAM requires
    the 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 Dynamic Server will use the traditional
    authentication mechanism to avoid changes for the users.

    The PAM modules are usually located in /lib64/security. The PAM services
    are defined in /etc/pam.d.

9.  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.

10. Raw Character Devices

    Some Linux distributions support binding a raw character device to a
    block device. Any block device may be used. Informix Dynamic Server
    supports using raw character devices.

11. OnSNMP

    The SNMP agent for OnSNMP is based on SNMP Research (SNMPR).

12. Secure Sockets Layer

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

       a. Before uninstalling GSKit, verify that it is not needed on your
          system. It is possible that software other than 
          Informix Dynamic 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- gskcrypt64-

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

          As root user run the dpkg command to remove each package as needed.
          For example:
          dpkg -r gskssl64 gskcrypt64

       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.

13. Simple Password Communications Support Module

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

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."

Defects Fixed in this release

For information about defects fixed in this release, see:

(C) Copyright IBM Corp. 2002, 2017
(c) Copyright HCL Technologies Ltd. 2017, 2022. All Rights Reserved. 

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