Informix Machine Notes
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================================= ================================= MACHINE SPECIFIC NOTES FOR IBM Informix Database Server 14.10.FC6 PRODUCT RELEASE ON IBM AIX 7.2 64bit DATE: 07 Jun 2021 ================================= OS Information : Built on AIX 7.2 Technology. System Requirements =================== 1. This product was built on AIX 7.2 Technology using the following compilers: IBM XL C/C++ for AIX, V11.1 (5724-X13) XL C/C++ Runtime 13.1.3 2. AIX patch requirement: TL2 (7200-02-02-1810) 3. The UNIX graphical tools provided with this release require X Window system X11R6 and Motif 2.3.4 or later runtime libraries. 4. 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. 5. If you are using Java(TM) UDRs, please refer to "AIX Loader Domains" under J/Foundation section for details. 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 22.214.171.124 is not installed, Informix server will install GSKit in /usr/opt/ibm/gsk8_64 directory on your machine. b. The GSKit installation directory must have 35 MB of free disk space. Check the following web site for the latest AIX system requirements for IBM Informix Database Server: http://www-01.ibm.com/support/docview.wss?rs=630&uid=swg27013343 System Configuration ==================== 1. Location of Shared Memory The ONCONFIG variable SHMBASE should be set to the following: SHMBASE 0x700000010000000 If you are using Java UDRs, refer to the J/Foundation section for setting the SHMBASE value. 2. Environment Variables a. 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 IBM Informix Database Server to perform recursive database tasks (for example, cascading deletes). b. If you are using Java UDRs, set environment variable LDR_CNTRL to include the value "USERREGS" and "LOADPUBLIC" before starting IBM Informix Database Server. export LDR_CNTRL=LOADPUBLIC@USERREGS Feature Notes (alphabetized by feature) ============= 1. High Performance Loader User-defined conversion routines must be provided in a dynamic, shared library called ipldd11a_64.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". To create a 64-bit shared library, the environment variable OBJECT_MODE should be set to 64 to convey to the compiler that a 64-bit object is to be generated. The "-q64" flag for cc can also be used to indicate to the compiler that 64-bit object is to be generated. 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 resolution file /etc/netsvc.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. 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 http://www.ibm.com/java/jdk/. Location of Shared Memory ------------------------- When using IBM Informix Server with J/Foundation, the ONCONFIG parameter SHMBASE should be set to the following: SHMBASE 0x700000030000000 AIX Loader Domains ------------------ If multiple shared libraries are loaded onto two VPs, one of which is a Java VP, and the libraries are not loaded in the same order on each VP, executing a function from the libraries can cause the IBM Informix Database Server to core dump with the following message in online.log: 09:35:58 Assert Failed: Exception Caught. Type: MT_EX_OS, Context: ill 09:35:58 Who: Session(15, informix@ibms70, 46918, 1075033896) Thread(41, sqlexec, 4010c7d8, 3) File: mtex.c Line: 372 09:35:58 Action: Please notify Technical Support. You would typically encounter this error if your application is using both C UDRs and Java UDRs. To resolve this problem, the AIX loader domains concept is used. The loader domain provides a means of loading shared libraries at the same virtual address in a set of processes. The loader domain file is created during the installation of the IBM Informix Database Server. This is installed as "/var/adm/ifx_loader_domain". IBM Informix Database Server with J/Foundation on AIX requires the loader domain file "/var/adm/ifx_loader_domain" to exist at all times. If the file does not exist, create it as superuser using the following commands: touch /var/adm/ifx_loader_domain chgrp informix /var/adm/ifx_loader_domain chmod 660 /var/adm/ifx_loader_domain 4. Kernel Asynchronous I/O (KAIO) KAIO is enabled by default on this platform. The AIO subsystem is loaded by default but not activated. No AIO server is started at AIX startup. The AIO server is automatically started when applications are initiating AIO I/O requests. It stays active as long as it services AIO I/O requests. To disable KAIO, set the environment variable KAIOOFF: KAIOOFF=1 ; export KAIOOFF ( for Bourne or Korn shell ) setenv KAIOOFF 1 ( for C shell ) Limit the number of resident memory segments allocated to Informix. If you allocate a lot of resident memory segments to Informix and Informix uses a lot of KAIO and direct I/O, KAIO read or write calls might fail with errno 22 (EINVAL). EINVAL errors can lead to down dbspaces or system aborts. The following error typically appears in the server log: 04:30:40 KAIO: error in kaio_WRITE, kaiocbp = 0x22b620d0, errno = 22 04:30:40 fildes = 258 (gfd 3), buf = 0x700000122b64000, nbytes = 4096, offset = 130785280 The usual reason for these EINVAL errors is that the OS is running low on resident memory pages because the Informix server has too many shared memory segments allocated as "resident," as well as pinned OS kernel memory and KAIO resources. You can prevent these errors by setting fewer, or no, Informix server shared memory segments as resident. Set the RESIDENT configuration parameter in the onconfig file to 1 or 0. 5. 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 68719460352 bytes. - The value for SHMADD is 67108848 kilobytes. 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. No Age (Disable Priority Aging) The no aging feature that disables priority aging of CPU virtual processors by the operating system can be activated by setting the noage option of the VPCLASS configuration parameter for the CPU virtual processors. For example, the following ONCONFIG entry specifies that there are 8 CPU VPs, each without aging: VPCLASS cpu,num=8,noage When the noage option is used, all oninit processes will run at priority 60 with fixed priority round robin type scheduling. To override the default priority value for CPU VP class, set the environment variable INFX_CPUVP_PRIORITY to the desired priority, within limits (50 to 90) before starting the server. The server checks and sets the CPU VP process to the defined priority if the defined value is within the above range. 8. 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 these functions, set the BAR_BSALIB_PATH parameter in $INFORMIXDIR/etc/$ONCONFIG to the full pathname of the library. Using $INFORMIXDIR/lib/ibsad001_64.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 Client version 5.3.2. 9. OnSNMP The SNMP agent for OnSNMP is based on SNMP Research (SNMPR). 10. Pluggable Authentication Module (PAM) PAM functionality is supported on AIX 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 modules typically resides in /usr/lib/security/64. The PAM services are defined in /etc/pam.conf. 11. 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. 12. 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. Uninstalling entails removing GSKit packages as follows: To remove package, as root user run the following installp -u -g -V2 GSKit8.gskcrypt64.ppc.rte GSKit8.gskssl64.ppc.rte 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. Shared Memory Residency Shared Memory Residency is supported. This feature can be enabled by setting ONCONFIG parameter RESIDENT to a non-zero value. Please read the KAIO section in this file if you are using Shared Memory Residency together with KAIO or DIRECT_IO, as this combination may cause problems. See APAR IC76872 for further information. 14. Simple Password Communications Support Module The name of the IBM Informix shared library for Simple Password CSM on on AIX is libixspw.so. 15. Single Sign On (SSO) This feature requires AIX system library libgssapi_krb5 to be installed on the system. This library is included in krb5.toolkit.adt (Network Authentication Service App. Dev. Toolkit). 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. Concurrent I/O on Shared Disk Secondary Servers. Defects Fixed in this release ============================= For information about defects fixed in this release, see: http://www.ibm.com/support/docview.wss?uid=ibm10870226 (C) Copyright IBM Corp. 2002, 2017 (C) Copyright HCL Technologies Ltd. 2017, 2021. All Rights Reserved.