AIXpert Blog is about the AIX operating system from IBM running on POWER based machines called Power Systems and software related to it like PowerVM for virtualisation, PowerVC for Deploying VM's and PowerSC for security plus performance monitoring and nmon
Just came across this good AIX wiki article about monitoring the POWER7 CPU/core frequency changing on the fly and the new lparstat command options ( -Ew). This allows you to see what is happening with your GHz (like pmcycles -M but collected regularly). This article is written by a guru in the AIX Performance Tools developers group. It explains how the utilisation numbers are adjusted to allow for GHz using the PURR and SPURR hardware counters built in the processor to get accurate CPU stats. Check it out here - CPU Frequency Monitoring using... [More]
Just a quick look at the features for AIX7 - which is coming soon. Take a look at AIX7 Preview for an official statement. The two major items for me are 1) Scaling to 256 cores (or CPUs as I have called them for 25 years) Power systems always had lower CPU counts than the competition particularly in the high end machines due to the faster speed of the processor and this benefits batch (single threaded) work, software costs (lower CPU numbers) and is easier for scaling up but now a truly massive POWER7 machine is near and AIX7 is the OS to run... [More]
The official rPerf rating (relative performance rating of Power based machines) are available in the pSeries, System p and now Power Systems "Facts and Features" documents that are on the IBM website. It is best to use Google for them (searching for "pseries Facts and Features" works for me). You may want to know the rPerf rating for your LPAR and an LPAR that is not one of the officially rated numbers of CPUs/Cores. There may be ratings for 8 and 16 CPUs but your LPAR has 13 CPUs! Well, you can run the rperf script on... [More]
Late last week Systems Director 6.2 was released - a few days early too! This is the free to download and use IBM platform management software from IBM. For us AIX guys that means Power Systems Hardware, HMC, IVM, VIOS and AIX - and Linux on POWER too This new release is was focused mainly performance, simpler install (or migration from 6.1) and rolling in many fixes that could not be addresses with service packs. There are also some new features like dual VIOS SAN support for VMControl virtual application deployment. AIX is obviously the... [More]
AIX 6.1 TL04 sp3 supports the new POWER7 machines like Power 750, 77 and 780, where CPUs can be run at slower speeds to reduce electrical energy use when not busy. This feature is switched on by Systems Director and the Active Energy Manager plugin which talks to the service processor to enables it. I like the "Dynamic Power Saving - Favour Performance" option. From the AIX end, the pmcycles command is used to find your current CPU frequency. Before switching on the energy saving: # pmcycles -M This machine runs at 3550 MHz - This... [More]
AIX Workload Partitions (WPAR) are now certified by Oracle for Oracle 10gr2 Oracle announces Oracle 10gR2 support for Workload Partitions IBM TechDocs Flash: AIX WPAR (Workload Partition) available for Oracle Database
PowerHA recently announced support for the following: PowerHA announces support for DS3400 PowerHA announces support SAS Adapters PowerHA announces support 5735 PCI-e Dual Fibre Adapter Click on the above linked text for full support details.
HACMP recently announced support for the following: PowerHA announces support for JS23/JS43 PowerHA announces support JS12 PowerHA announces support for Async GLVM PowerHA/XD Announces Support for SVC 4.3.1 Click on the above linked text for full support details.
Using NIM to install VIOS 2.1 The install may hang with after the message: "Mounting File Systems" Why? VIOS 2.1 requires more than 1GB of memory typical for VIOS 1.5 From the Release Notes: Each LHEA *port* assigned to the VIO Server requires a minimum of 612MB (not a typo) of memory - *each* port. This is in addition to the base memory that VIOS 2.1 itself requires (typically 512MB). Example: If you have two  LHEAs assigned to VIOS 2.1, the VIOS will need a minimum of: 612 MB + 612 MB + 512 MB = 1,736MB (LHEA) + (LHEA) + (Base) =... [More]
With day light savings time nearing, its a good time to check if your AIX version has the proper patches. There were some problems in some TL's last fall. The recommended levels are: AIX 6.1 Package Level shipped APAR/Filesets 6100 TL0 6100-00 IZ09600 bos.rte.libc 18.104.22.168 6100 TL1 6100-01 IZ22211 bos.rte.libc 22.214.171.124 AIX 5.3 Package Level shipped APAR/Filesets 5300 TL8 SP2 5300-08-02-0822 IZ22212 bos.rte.libc 126.96.36.199 Package Level shipped APAR/Filesets 5300 TL7 SP2 5300-07-02-0806 IZ11729 bos.rte.libc 188.8.131.52 If you have any questions, check... [More]
This is a new feature of starting with AIX 5.3 TL9 and AIX 6.1 TL2. svmon will now report a new metric called "available memory." This is the amount of memory available to applications. It includes memory in the file cache. The basic idea is that a user can consume the "available memory" without causing the system to start paging to paging space. Once "available memory" is depleted, AIX will have to start paging out to paging space. To get svmon to display the available metric, you can specify the ''-O summary=basic" option. There are a... [More]
Samba is an open source, free software suite that provides seamless file and print services between Windows® clients and UNIX®-like platforms. It can be run on a UNIX-like platform like AIX®, BSD® UNIX, Linux®, IBM® 390 and OpenVMS. Samba uses the TCP/IP protocol that is installed in the host server. When configured, this server software allows the host machine to share files and printers and make them accessible from Windows clients. The following URL provides setup instructions... [More]
There is a potential problem with AIX display of local time which might occur around the transition to standard time this coming weekend. If the problem occurs, in most cases the only impact is that AIX displays local time incorrectly for a day or so around the transition to or from daylight savings time. AIX displays standard time when it should display daylight savings time or vice versa. Of course, while local time is being displayed incorrectly, if some local time is provided to an application (eg, changing the AIX system clock,... [More]
The System p Support site has migrated to a new subscription service tool for support notifications named My notifications You'll need an IBM Developerwork's ID. (It's free and painless to register a new ID) Subscriptions for IBM Systems provides the following new features: - Ability to create multiple subscriptions with different topics and notification options- Ability to create and name multiple folders to organize your subscriptions- Ability to specify weekly or daily notifications when a topic is updated- Ability to access the PTF Cover... [More]
As of Service Pack 1 of HMC V7R3.3, there's a new access control that must be considered when creating new users. By default, remote access is not allowed, even if in general you've already allowed remote users. The box to check if you want to allow remote access is found under User Properties in the task used to create or modify a user's account. When creating a user account, remember to click on User Properties at the bottom of the task menu. In the lower left corner of the menu that comes up next you'll find a check box that says Allow... [More]
The documentation for HMC Version 7 says that the web browsers supported are Microsoft Internet Explorer 6.0 and later, as well as Firefox 184.108.40.206 and later. While many users have no trouble with Internet Explorer 7.0, others have reported problems. What makes the difference? Sometimes its Java code, and sometimes its the browser settings. For example, a customer recently reported trouble with IE 7 after he updated Java to jre 1.6.0_05 from jre 1.6.0_03. Previously, IE 7 had worked fine. IBM support usually will make a best-effort attempt... [More]
HACMP recently announced support for the following: HACMP 5.4.1 for Linux HACMP Support Announcement for the JS22 HACMP supports the IBM 4-Port Ethernet 10/100/1000 Base-TX PCI-X Adapter HACMP announces support for P6 p520 and p550 HACMP supports IBM VIO Server V1.5 Click on the above linked text for full support details.
Be sure you order the correct Hardware Management Console to match the code you plan to run. The 7042 machine type is for HMCs running Version 7. This Licensed Internal Code is a requirement for managing POWER6 servers, such as the 9117-MMA. However, it will also support POWER5 and POWER5+ managed servers. The 7310 machine type is for HMCs running Version 6. You cannot manage a POWER6 server using this HMC code. It is for POWER5 and POWER5+ managed servers only. Many 7310 HMCs can be upgraded in the field to support HMC V7 Release 3 code. ... [More]
Here are several URL's for Open Source Tools for AIX. The "IBM AIX Toolbox" has the most tools, but not necessarily the most current versions. The most current version are on the "AIX Open Source" and "Hudson Valley CC" URLs. IBM AIX Toolbox for Linux Applications - http://www.ibm.com/servers/aix/products/aixos/linux/download.html AIX Open Source - http://www.perzl.org Hudson Valley CC - http://pware.hvcc.edu (Includes AMP, gcc 4.2., samba under "bundles" directory ) Bull Open Software archive for AIX - http://www.bullfreeware.com Bull... [More]
Configuring MPIO for the Virtual Client , describes how to set up Multi-Path I/O boot disks for AIX clients of the virtual I/O server. There some considerations for booting off the SAN. The "pro's" include: IBM supported configuration Flexibility The "con's" include: If the SAN fails Can not capture an AIX dump file (Consider putting dump space on an internal disk) Lose the ability to diagnose the failure from the server side. Updating MPIO on the AIX client may be disruptive (depends on MPIO vendor/version) "Momentary SAN stalls" can cause... [More]
Steve Pittman has posted his AIX 5.3 "best practices" on the following wiki's. AIX Wiki home: http://www-941.haw.ibm.com/collaboration/wiki/display/WikiPtype/Home System Admin Best Practices1: http://www-941.haw.ibm.com/collaboration/wiki/display/WikiPtype/AIXV53AdminBestPractice System Admin Best Practices2: http://www-941.haw.ibm.com/collaboration/wiki/display/WikiPtype/AIXV53AdminBPFiles Installation Best Practices: http://www-941.haw.ibm.com/collaboration/wiki/display/WikiPtype/Installation Software Maintenance Best Practices:... [More]
I use the following formula to size the minimum number of cores on replacement servers. The formula is based on "used" performance on the installed servers matching "used" performance on the replacement server. c2 = (u1)(c1)(p1) / (u2)(p2) Where c1 = # cores on the installed server p1 = "performance per core" of the installed server u1 = % utilization of the installed server c2 = # cores on the replacement server p2 = "performance per core" of the replacement server u2 = % utilization of the replacement server If consolidating multiple... [More]
Here are three recent IBM Techdocs covering Oracle on AIX. Oracle 9i and 10g on IBM AIX5L: Tips and Considerations (8/20/07) http://www-03.ibm.com/support/techdocs/atsmastr.nsf/WebIndex/WP100556 Oracle DB and RAC 10gR2 on IBM AIX 5L: Tips and Considerations (8/20/07) http://www-03.ibm.com/support/techdocs/atsmastr.nsf/WebIndex/WP101089 Oracle Architecture and Tuning on AIX (6/16/07) http://www-03.ibm.com/support/techdocs/atsmastr.nsf/WebIndex/WP100883