Informix Machine Notes
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================================= MACHINE SPECIFIC NOTES FOR IBM Informix Database Server 11.70.UC6 PRODUCT RELEASE On Linux Intel DATE: 27 Sep 2012 ================================= OS Information : Built on Red Hat Enterprise Linux ES release 5.3 (Tikanga). Certified on RHEL 6, SUSE SLES 11, Ubuntu Server Edition 8.04 and 10.04 LTS, Asianux 3 SP3, and Debian 5.0, on i686 and x86_64 (EM64T/AMD64) System Requirements =================== 1. This product was built on Red Hat Enterprise Linux ES release 5.3 (Kernel: 2.6.18, Glibc: 2.5.34) for i686 compatible processors. The i686 version of glibc is required. The following compilers were used: gcc and c++ compiler 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 libgcc4.1.2 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) for i686 and x86_64 (EM64T/AMD64). 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) for i686 and x86_64 (EM64T/AMD64). 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 - Asianux 3 SP3 (Kernel: 2.6.18, Glibc: 2.5.49). for i686 and x86_64 (EM64T/AMD64). The following packages have to be installed: libaio-0.3.106 libgcc-4.1.2 libstdc++-4.1.2 ncurses-5.5 pam-0.99 - Ubuntu Server Edition 8.04.1 LTS (Kernel: 2.6.24, Glibc: 2.7.10) for i686 and x86_64 (EM64T/AMD64). The following packages have to be installed: libgcc 4.2.4 libstdc++6 4.2.4 libncurses5 5.6 libpam 0.99 Installing the product on Ubuntu or Debian requires RPM to be installed and initialized. After RPM installed, use the following commands to initialize RPM: mkdir -p /var/lib/rpm rpm --initdb 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 OpenMotif runtime libraries version 2.3.x. The minimum version is 2.3.1, i.e. openmotif-2.3.1 or openmotif-libs-2.3.1. 3. The Korn shell is required for the ISM and Informix server alarmprogram scripts. Install it as /bin/ksh. On Ubuntu Server Edition, pdksh needs to be installed. 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. If the product runs on Ubuntu Server Edition x86_64, the following 32-bit packages are required: libc6-i386 libncurses The 32-bit libncurses is missing and not packaged, you need to copy it from a i386 (32bit) installation: /lib/libncurses.so.5 to x86_64 32-bit compat libs: /lib32/libncurses.so.5. 5. The High Performance Loader utilities, onpload and ipload, 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 GSKit8 is not installed, Informix server will install GSKit in /usr/local/ibm/gsk8 directory on your machine. b. The GSKit installation directory must have 25 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: 33554432 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 is set to the following: SHMBASE 0x44000000L - SHMBASE can also be set to start above the shared library addresses. When doing so, ensure that dynamically loaded shared libraries do not collide with the shared memory segments. The address space layout can be checked by the following command: $ cat /proc/<pid of oninit process>/maps 3. JRE Shared Libraries Ensure that the JRE shared libraries are loaded properly within the Java Virtual Machine by adding the following three directories to the Informix library path: a. $INFORMIXDIR/extend/krakatoa/jre/bin b. $INFORMIXDIR/extend/krakatoa/jre/bin/classic c. $INFORMIXDIR/extend/krakatoa/jre/lib Add the directories to the path by using either of the following two methods: I. Modify the ld.so library cache. Add the three library paths to the /etc/ld.so.conf file, and update the ld.so cache by running /sbin/ldconfig as user root. This method makes system wide changes that can affect other applications that use Java. II. Modify the value of the oninit ELF DT_RPATH tag. Use the $INFORMIXDIR/etc/brand tool to modify the ELF DT_RPATH tag in the Informix oninit binary. Run the tool as user root while the server is offline. To modify the value of the ELF DT_RPATH tag, run the following command: brand -r "$INFORMIXDIR/extend/krakatoa/jre/bin:$INFORMIXDIR/extend/krakatoa/jre/bin/classic:$INFORMIXDIR/extend/krakatoa/jre/lib" $INFORMIXDIR/bin/oninit To print and verify the existing ELF DT_RPATH tag, run the following command: brand -t $INFORMIXDIR/bin/oninit Substitute $INFORMIXDIR with the value of your INFORMIXDIR environment variable. Feature Notes (alphabetized by feature) ============= 1. High Performance Loader User-defined conversion routines must be provided in a dynamic, shared 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. Depending on the location of the shared libraries, OS stack etc., a suitable location of pload shared memory spaces needs to be determined. Linux system administrator is the best person to find the correct values for PLOAD_SHMBASE for his particular system. The suggestive values for PLOAD_SHMBASE could be 0x10000000L, or 0x44000000L. 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 address. 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. J/Foundation (Java in the Server): J/Foundation supports the JRE 6.0 release from IBM Corporation, which uses the Linux native threads based Java Virtual Machine. JRE 6.0 is available under $INFORMIXDIR/extend/krakatoa/jre and should be used with J/Foundation. To use this JRE, set the value of the ONCONFIG variable JVPJAVAHOME as follows: JVPJAVAHOME <jvphome>/jre where <jvphome> is $INFORMIXDIR/extend/krakatoa For developing Java UDRs used with J/Foundation, use the JDK 5.0, which can be downloaded from: http://www.ibm.com/developerworks/java/jdk/eclipse/ For IBM Informix Database Server ONCONFIG settings for J/Foundation, refer to "onconfig.std" in $INFORMIXDIR/etc. Java Attach API ------------------ There is a known defect (IZ73533) in the IBM Java SE Runtime Environment SR7 where if the Attach API is enabled, it causes high CPU utilization. In order to avoid this behavior, the Attach API has been disabled by setting the following server ONCONFIG parameter: JVPARGS -Dcom.ibm.tools.attach.enable=no 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 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. 5. MQ Messaging Database Extension The MQ extension provides mechanism for data exchange between Informix server and queues managed by Websphere MQ. 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. 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). 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. OnSNMP The SNMP agent for OnSNMP is based on SNMP Research (SNMPR). 9. Optical The Optical feature has not been tested with the Optical Simulator. The name of IBM Informix shared library for Optical on Linux 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. 10. 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. 11. 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. 12. Raw Character Devices Some Linux distributions support binding a raw character device to a block device. Any block device may be used. IBM Informix Database Server supports using raw character devices. 13. 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 gskssl32-184.108.40.206 gskcrypt32-220.127.116.11 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. 14. 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. Database Extension registration using the blademgr utility with a Secure Sockets Layer (SSL) connection. Use the built-in SQL SYSBldPrepare( ) function to register the Database Extension instead. Known Defects in this release ============================= For information about known defects in this release, see: Click here for a list Defects Fixed in this release ============================= For information about defects fixed in this release, see: Click here for a list Defects Fixed in Previous Releases ================================== For information about defects fixed in previous releases, see: http://publib.boulder.ibm.com/infocenter/idshelp/v117/topic/com.ibm.relnotes.doc/relnotes.htm (C) Copyright IBM Corp. 2002, 2012