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
Common question: I see XX% of Used Memory but I don't know who is using it and how?
A simple question but there is no simple answer as memory use if complex.
nmon then hit "m" will quickly show you a few big uses of memory as below:
The shared memory used by lots of applications like DB2 and Oracle - check the SEGSZ for the size.
The Owner column usually tells you what it is used for like the oracle user for the SGA or db2inst1 for the DB2 buffer... [More]
Stephen Atkins (the Guru behind the nmon Analyser) has released a new version - two days ago. This includes loads of improvements and some new features. Best of all - less problems running on newer Excel releases (it works around inconsistencies with the Microsoft API). I have always said that at least 50% of the popularity of my nmon is down to the excellent Analyser graphs. Very few people regularly see the online screen view. Thanks again Steve, for all your many hours of hard work in your personal time on the behalf of the tens of... [More]
Update: The developers and the manuals call this Load Sharing but most people think it is called Load Balancing. Perhaps, balancing gives the wrong impression of fine grain packet by packet balancing where we actually have higher level, cruder splitting of the work with Sharing. Below I use the word Balancing but mean Sharing. I have got a few questions recently on how to set this up as there are announcement with near zero information on setup, the configuration needed and a worked example. So here goes. For a long time now we have had SEA... [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]
This mysterious AIX CPU Folding area is often misunderstood, so below is what I know from osmosis from talking to various guru level developers over the last 10 years. Shared Processor virtual machines (LPARs for the old fashioned) have a setting called Virtual Processors (or VP for short). This is the number of physical CPUs that the virtual machines can spread out across - in fact, I prefer to call it the "spreading factor" as it is much more obvious what it means. This can be the upper threshold for the number of CPUs that can be... [More]
I have had a couple of Power systems administrators make assumptions about the virtual Ethernet speed improvements when they install a 10 Gb IVE/HEA in a VIOS which are simply not true. I guess that if three teams have made this mistake then others are about too. So I intend here to put the record straight. The expectation is that (deliberately fully spelt out long-hand to make it very clear): When they upgrade the Integrated Virtual Ethernet (also called a Host Ethernet Adapter) from 1 Gigabit per second to 10 Gigabit per second that the... [More]
It was my birthday on Saturday and by pure luck my Raspberry Pi was delivered the day before - what a great day "hacking" (in the old sense of the word). I have been waiting for a few months for this delivery - What a treat!! If you have not heard of this credit size computer before here is the back ground. The Problem In the UK, school information technology education has been pitifully reduced to Microsoft Word, Excel and Powerpoint. My own kids came home badly depressed as they started the classes as they knew far more than the... [More]
I am getting this question quite a lot and the answer is it depends on the model and when it was made available.
These are the minimums but higher service packs are recommended .
Power 750, 755 (Jan)
Power 770,780 (March)
Blade 700, 701,702 (June)
Power 710, 720, 730, 740, 795 (Sept)
AIX 5.3 TL9
SP7 SP7 - -
AIX 5.3 TL10
SP4 SP4 SP5 SP5
AIX 5.3 TL11
SP2 SP2 SP5 SP5
AIX 5.3 TL12
* * * SP1
Power 750, 755 (Jan)
Power 770,780 (March)
I often get asked: How large to make a pair of Virtual I/O Server (VIOS)? The classic consultant answer is "it depends on what you are doing with Disk & Network I/O" is not very useful to the practical guy that has to size a machine including the VIOS nor the person defining the VIOS partition to install it! Observations : The VIOS server unfairly gets a bad press but note: Physical adapters are now in the VIOS, so device driver CPU cycles (normally hidden and roughly half of the OS CPU System time) move to the VIOS - this is not... [More]
A large UK customer is running a series of tests on AIX and POWER7 machines and wanted to display the results on a webserver using rrdtool and needed help getting a working example running. So I stepped up to the challenge one night rather than it becoming a search for rrdtool skills inside IBM - when I could sort something out in a few hours. No one in IBM would claim to be a rrdtool expert until they knew the details of what was required. Many people know it well enough to get what they want done but would not put rrdtool guru on their CV. ... [More]
Earlier today I received email from a customer reporting their large POWER7 based machines where on firmware 720_64 to 720_90 and their reluctance to take the outage to upgrade it. They were asking for fine details of newer firmware levels and what advantages this would bring to " justify the outage to their user departments ". To be blunt this is a horror story: I lay awake at night in a cold sweat about stories like this. The customer has the whole "running computers plan upside down". The question should be " can... [More]
This is a follow on to a previous blog on " PowerVM Virtual Ethernet Speed is often confused with VIOS, SEA IVE/HEA speed "- here is a Direct Link I regularly get asked : "I have just heard about this [PowerVM virtual switch | vSwitch | Hypervisor Ethernet Switch] is available but I can't find out any information at all, help!" They are wanting to run two (or more) virtual switches within the one Power machine to completely separate the network packets of groups of virtual machines (LPARs) so they know for sure there can... [More]
We all know that a VIOS level is only fully supported for 2 years ... right! If you have problems with an older VIOS, you may be asked to upgrade to a supported level before a fix can be issued. Most teams run a dual VIOS configuration to allow painless and live upgrades for just this reason. The other reason is to survive a VIOS crash but I have never had a VIOS failure but that would be because I don't go fiddling with them nor adding unsupported software. I quickly upgraded my POWER7 VIOS from 2.1 to the latest VIOS level and made a... [More]
I spent two days with a "well known brand" UK retailer trying out Versioned Workload Partitions (vWPAR). Actually, it was with an IBM Business Partner that runs the machines for them- two knowledgeable and fun guys to work with - we were asked by the European manager in the next room to keep the noise down! This Versioned WPAR technology lets you run AIX 5.2 or AIX 5.3 inside an AIX 7 on Power7 Workload Partition (WPAR). You simply get the source AIX up to the required level (which you should already by running), then take a mksysb... [More]