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
When you install Linux on an IBM POWER processor machine (Red Hat, SUSE or now includes Fedora), you then need to add the IBM supplied additional RPM packages. These give you a whole bunch of useful tools like HMC comms so you can Dynamic LPAR change and LPM, diagnostic tools, and configuration listing commands. Plus more importantly nmon :-) The repository allows you to update your packages as new versions become available and to benefit from fixes and additional functions. Without these you don't get the full Power... [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
I have tried to get permission to pass on these numbers publically but got no answer at all. As these are facts rather than opinions, I see no harm in them. So I will work on the old theory: "it is easier to ask for forgiveness than permission" ... here goes.
The AIX Virtual User Group often asks a few questions as part of the registration process for the next webinar session and it generates fascinating statistics from real POWER and AIX users.
The people that join the AIX Virtual User Group are... [More]
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]
Many people in computing, we seem fixated on "percentages" when talking about CPU use - We need to fix that.
When a computer has an absolutely fixed number of CPUs on the time scale of a few years the percentages of the box makes a lot of sense.
But in a virtualised world we will have to change.
For 10 years, we can do Dynamic CPU changes to a LPAR (Virtual Machine).
Yesterdays 40% used is today's 80% because the admin guy added a couple of CPUs over night.
If we look at the percentages and see a... [More]
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]
If while installing SUSE SLES 11.3 on your POWER8 machine from the regular DVD media, you get this on the console after 5 seconds after booting:
Welcome to SuSE Linux Enterprise 11!
Type "install" to start the YaST installer on this CD/DVD
Type "slp" to start the YaST install via network
Type "rescue" to start the rescue system on this CD/DVD
Welcome to yaboot version r22.8-r1190.SuSE... [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]
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 188.8.131.52 6100 TL1 6100-01 IZ22211 bos.rte.libc 184.108.40.206 AIX 5.3 Package Level shipped APAR/Filesets 5300 TL8 SP2 5300-08-02-0822 IZ22212 bos.rte.libc 220.127.116.11 Package Level shipped APAR/Filesets 5300 TL7 SP2 5300-07-02-0806 IZ11729 bos.rte.libc 18.104.22.168 If you have any questions, check... [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]
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]
IBM is starting to contact customers and business partners urging them to pay very close attention to keeping firmware current in order to minimize unscheduled outages. Here's an excerpt from a letter sent to IBM Business Partners: "Ensuring all IBM pSeries systems in customer locations are up to date on Firmware loads is essential to achieving the highest level of customer satisfaction possible. Firmware updates provide increased hardware reliability to customerseServer p5 systems. But we can't get the word out to all our customers without... [More]