AIXpert Blog is about the AIX operating system from IBM running on POWER based machines called Power Systems and software related to it like IBM Systems Director, PowerVM for virtualisation and PowerSC for security plus performance monitoring and nmon
Here is Jaqui Lynch's AIX 5.3 initial tuning guidelines for commercial workloads. Jaqui wrote and delivered the "AIX Performance Tuning" session at the "IBM System p, AIX, Linux Technical University" this year in Las Vegas. no -p -o rfc1323=1no -p -o sb_max=1310720no -p -o tcp_sendspace=262144no -p -o tcp_recvspace=262144no -p -o udp_sendspace=65536no -p -o udp_recvspace=655360nfso -p -o nfs_rfc1323=1nfso -p -o nfs_socketsize=60000nfso -p -o nfs_tcp_socketsize=600000vmo -p -o minperm%=5vmo -p -o minfree=960vmo -p -o maxfree=1088vmo -p -o... [More]
Yes this is still the AIX pert Blog but my beautiful POWER8 machines can also run that "odd ball" operating system now called IBM i. That should generate some comments :-) We have a project to install IBM i 7.2 and then adopt it into PowerVC for Capture and Deploy. This feature is in beta test and selected customers allowed to give it ago. It is planned for full release later this year (that is not an IBM promise). If you are interested in testing PowerVC with IBM i visit:... [More]
Here is a great index page for AIX information. Most ofthe links are to www.ibm.com ... but you get to avoid theIBM search engine :-) One of the very nice features is that every link (or leastevery one I tried) opens a new window. http://www.aix.lap.hu There is also a Google-based search engine for AIX: http://www.aixsearch.com
The following paper by Ralf Schmidt-Dannert discusses the performance impact of AIX micropartition options on a 2 tier Java/C++/Oracle application. His benchmarks show micropartitioningcan have a positive impact on application performance. His conclusionsinclude: 1. The micropartition CPU sharing improved performance over static LPARs2. SMT improved performance (default AIX setting)3. Don't over configure Virtual Processors (My recommendation is to configure at most one Virtual Processor per CPU in the free pool)... [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.
Starting in AIX 5.3 ML5, there is a new "topas -R" option that records theperformance of all partitions on a physical server. The command is runon just one server, and the output is stored in the /etc/perf directory. The "topasout" command converts the output file into a CSV or XML file. The CSV file can be imported into the nmon Analyser 3.2.3+. (Requires AIX 5.3 TL5 service pack 4 with APAR IY87993) The advantage is that topas is a supported tool. The disadvantage isthat it is not well documented, and you have to do some of the parsing. ... [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]
RSS is a web feed technology that allows you to monitor web sites that change frequently (blogs, technical forums, updates, news, etc). IBM has over 300 IBM RSS feeds which are listed on the following website. http://www.ibm.com/ibm/syndication/
One way to determine if there is an I/O bottleneck in AIX's Logical Volume Manager (LVM) layer is to run the "filemon" command. The filemon output shows I/O response times for both Logical Volume (LV) and Physical Volume (PV) layers. If the difference is over 2-3 ms, there could be an I/O bottleneck in LVM. If so, check the LVM buffer statistics at peak I/O loads. Run the "vmstat -v" several times, and look for increasing "I/Os blocked" in any of the buffers. (The rate of change is important, not absolute values). Use the "ioo" command to... [More]
This blog also applies to Power Servers running Linux on Power native on the machine. While you can perform a text based Linux install on the dumb console terminal emulator (see previous AIXpert Blog about the serial cable that you need and the software) as a challenge to survive the Tab navigation, space selection, sometimes the cursor works and occasional Function Key show stopper (SUSE SLES 11) - I would recommend a VNC install. First, you can get back to your desk to run VNC viewer client to complete the install and not stand in the noisy... [More]
Configuring a Shared Ethernet Adapter (SEA) for failover in the Virtual I/O Server V1.2 is much different than in the original version. Because the code just came out last fall, it probably hasnt been implemented yet in many shops, but it will be. The pSeries ATS group in Dallas has done some testing and we thought we discovered a potential gotcha. Turns out, we didn't, but it did lead to some interesting observations. Until now, most documentation shows putting the Virtual I/O server's IP address on the SEA. The Virtual I/O server should... [More]
Unlike its predecessors, the 7042 Hardware Management Console for a POWER6 server does not have to be within 25 feet of the managed system. However, there may be practical reasons why it will continue to be close to the machines it manages. The purpose behind the distance limitation was to facilitate work by an IBM Service Support Representative. One of the HMC's functions is to serve as a repository of service information and tools. Some service utilities, such as the ability to blink lights on and off to identify adapters, would be... [More]
Support for the new Power5+ Servers: http://w3-03.ibm.com/support/techdocs/atsmastr.nsf/WebIndex/FLASH10519 HACMP supports the IBM System Storage DS4200 Express http://w3-03.ibm.com/support/techdocs/atsmastr.nsf/WebIndex/FLASH10514 HACMP supports SVC 3.1 & Metro Mirror Express http://w3-03.ibm.com/support/techdocs/atsmastr.nsf/WebIndex/FLASH10513 HACMP supports the JS21 BladeCenter Express http://w3-03.ibm.com/support/techdocs/atsmastr.nsf/WebIndex/FLASH10512 HACMP supports the IBM System Storage DS4700... [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]
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.