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
We needed to install AIX 5.2 in order to create a mksysb for AIX 7 Versioned WPAR testing - this allows you to run AIX 5.2 in a WPAR. First we had endless problems locating media but our Computer Room Manager Mike turned up trumps in the end - he keeps everything and regularly saves the day. So we loaded all 7 CDROMs on to our VIOS to add them to the virtual Optical Library. Second, we booted from the CDROM only to with an immediate halt with a warning the AIX 5.2 can't run in a Shared CPU LPAR - doh! we should have realised that one. It was a... [More]
The AIX 7 Open Beta is available now - this gives you access to the version to be released later this year. Find the summary in a earlier AIXpert blog and then the details at the new AIX7 Open Beta website. I have downloaded the image at just 2.4 GB (watch out for your 1GB default ulimit) for the entire AIX OS and have it running fine. I installed via my VIOS based virtual optical drive. Also included are access to new compilers versions, the AIX7 documentation and support via a Forum.
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 the... [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]
No more ordering CDROMs or DVDs for AIX installation media and waiting days - Note: this also works for IBM i. Now you download the AIX install .iso image over the web and install from
there: Use the virtual DVD drive on your VIOS 2.1 and install directly
into a LPAR Mount the image & read the contents into your NIM Server If you are a Luddite then burn a DVD and put it in the Power machine Mounting a .iso image on AIX is still hard work On recent AIX 6 systems
use the loopmount command. On older AIX versions use this
method from... [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 220.127.116.11 6100 TL1 6100-01 IZ22211 bos.rte.libc 18.104.22.168 AIX 5.3 Package Level shipped APAR/Filesets 5300 TL8 SP2 5300-08-02-0822 IZ22212 bos.rte.libc 22.214.171.124 Package Level shipped APAR/Filesets 5300 TL7 SP2 5300-07-02-0806 IZ11729 bos.rte.libc 126.96.36.199 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]