Informix Machine Notes

                      =================================
                            MACHINE SPECIFIC NOTES
                                    FOR
             IBM Informix Database Server 11.70.FC5 PRODUCT RELEASE
			       On Linux zSeries
                               DATE: 09 May 2012
                      =================================

OS Information : Built on Red Hat Enterprise Linux ES release 5.3 (Tikanga).
                 Certified on RHEL 6 and SUSE SLES 11.

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

1.  This product was built on Red Hat Enterprise Linux ES release 5.3
    for zSeries mainframe with 64-bit Kernel 2.6.18-274.7.1.el5 and glibc 
    glibc 2.5.34, using the following compilers:

       gcc version 4.1.2 20080704 (Red Hat 4.1.2-44)

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

        libaio-0.3.106
        libgcc-4.1.2
        libstdc++-4.1.2
        ncurses-5.5
        pam-0.99

    This product has been certified on:

        - Red Hat Enterprise Linux ES release 6.0 (Kernel: 2.6.32, Glibc: 2.12).
          The following packages have to be installed:

          libaio-0.3.107
          libgcc-4.4.4-13
          libstdc++-4.4.4-13
          compat-libstdc++-33-3.2.3
          ncurses-5.7
          pam-1.1.1

        - SUSE SLES 11 (Kernel: 2.6.27, Glibc: 2.9). The following packages 
          have to be installed:

          libaio-0.3.104
          libgcc43-4.3.3
          libstdc++43-4.3.3
          ncurses-utils-5.6
          pam-1.0.2

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 ISM and 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 0x90000000L


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".

    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 

    IBM Informix Server supports Internet Protocol Version 6 (128 Bit Internet
    Addresses) as well as IPv4 (32 Bit Addresses).
   
    In order for the machine name specified in the SQLHOSTS file to resolve to 
    the correct IP address, the name services files on the operating system 
    should be correctly configured. If the machine has IPv6 address configured
    and the listener thread is bound to an IPv6 address, then the name
    resolution files /etc/nsswitch.conf should be configured to fetch IPv6
    addresss. Also use the appropriate /etc/hosts setting if local machine 
    settings are used.
    
    For compatibility with older IBM Informix client and server products, 
    assign the same hostname 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 IPv4 address,
    then an explicit IPv4 address needs to be put in nodename 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 protocol(s)/interface(s) are supported besides shared memory
    on this platform:

        Berkeley sockets using TCP/IP
        IPC using stream pipe (implemented using Unix Domain Sockets)

        To use sockets with TCP/IP:

            a. NETTYPE 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 Informix 
               Database Server, NETTYPE in the ONCONFIG file and the value data 
               of protocol in the sqlhosts file entry must contain "drsoctcp"

               If a CLI or JCC client wants to connect to Informix server via 
               DRDA while supporting SQLI connections you could add a 
               DBSERVERALIASES entry to ONCONFIG which corresponds to the 
               sqlhosts file.

        To use IPC (interprocess communication) with stream pipe:

            a. NETTYPE 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.
    FASTPOLL in the ONCONFIG file can be set to 0 to disable the fast poll.
    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 used for supporting 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, the library must be installed in one 
    of the three ways noted below:
 
        a. Rename the library to $INFORMIXDIR/lib/ibsad001.so.
 
        b. Create $INFORMIXDIR/lib/ibsad001.so as a symbolic link to the 
           library.
 
        c. Set the BAR_BSALIB_PATH parameter in $INFORMIXDIR/etc/$ONCONFIG
           to the full pathname of the library.

    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

    The Optical feature has not been tested with the Optical Simulator.
    The name of IBM Informix shared library for Optical is "iosm11a.so".
    This library must be located in $INFORMIXDIR/lib (or must have a link
    provided in $INFORMIXDIR/lib). Refer to the "Optical Subsystem Guide"
    for more information about enabling optical functionality.

9.  Pluggable Authentication Module (PAM)

    PAM functionality is supported on Linux operating system. The PAM is 
    dependent on the libpam.so library supplied by the Operating System 
    vendor.

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

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

10.  Processor Affinity

    The processor affinity feature, that allows the pinning of a CPU VP
    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 gskssl64-8.0.13.3 gskcrypt64-8.0.13.3 

       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.  J/Foundation

2.  OnSNMP
 
3.  Basic Text Search Database Extension

4.  Spatial Database Extension

5.  Web Feature Service Database Extension

6.  XML Publishing

7.  Shared Disk Secondary Servers


Known Defects
=============

Refer to section I in doc/ids_defects_11.70.txt for the information 
regarding known issues.


Defects Fixed in current Release
================================

Refer to section II in doc/ids_defects_11.70.txt for the information 
regarding defects fixed in this release.


Defects Fixed in Previous Releases
==================================

Refer to rest of sections in doc/ids_defects_11.70.txt for the information 
regarding defects fixed in previous releases.


(C) Copyright IBM Corp. 2002, 2012