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
Inspired by this TED Talks Video on Leadership
TED Talk by Simon Sinek
Topic: How Great Leaders Inspire Action
18 minutes long
It tells us to start with Why? To win hearts and minds.
And not explain What? or How? until the Why? is very clear.
I thought I would make an attempt:
We believe server sprawl means a future in which we drown in small computers taking 80% of the... [More]
I regularly get asked to run a demonstration for IBM Systems Director but that is a time consuming business for both me and the audience. Especially, when you can find out every thing that I know from the comfort of you own office or even home office plus Stop, Replay and Pause via YouTube videos. So here is a reminder and hopefully a page I can point to when I next gets asked.
ISD63 Workshop 1 Techie Intro... [More]
The latest Versioned Workload Partition (VWPAR) Version 1.1.2 is available but largely secret!
With this update I get on my AIX 7 virtual machine, in which I have installed both AIX5.2 and AIX 5.3 support:
# lslpp -L | grep -i vwpar
vwpar.52.rte 220.127.116.11 C F AIX 5.2 Versioned WPAR Runtime
vwpar.images.52 18.104.22.168 C F Versioned WPAR 5.2 Support
vwpar.images.53 22.214.171.124 C F Versioned WPAR 5.3 Support
vwpar.images.base 126.96.36.199 C F ... [More]
Most AIX system administrators use: smitty tcpip to add a hostname, IP address, network mask, gateway and DNS server setting to get the virtual machines (LPAR) and AIX on a network. And as a side benefit so we don't need to use the ghastly VTERM console any more as ssh or the dreaded unsecure telnet (just don't do it) can now be used - as the root user:
# smitty tcpip
Minimum Configuration & Startup
Use DHCP for TCPIP Configuration & Startup
I had better point out that any performance tool of AXI command in a POWER Virtual Machine (LPAR) can only see its use of the Physical CPU, the size of its own CPU pool and (if Monitoring is switched on at the HMC), it has a number of the CPU use by "Other LPARs" use of its own CPU Pool. nmon gets these numbers by default and the nmon analyser graphs this data in the LPAR tab - this assumes its a Shared CPU LPAR. If it is a dedicated CPU LPAR then it can't get any of this Pool data and there is no LPAR tab in the nmon... [More]
The answer is "it depends" and there is no Rule Of Thumb - IMHO.
The 2 times ROT is very old school and for small servers where peaks could really run out of RAM fast and hurt.
The worst I saw was 6 times but that was OS guys and RDBMS guys and app guys all said 2 times ... each!! and then the System Admin guy just added them up not realising it was the same 2 times! Basically, bonkers and they used 2% in the end.
With machines with large memory, say starting at 64 GB, the memory demand... [More]
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]
The fifth POWER Ask the Experts is a one day customer technical event in the UK which ran in Manchester and London on 15th/16th July 2013. It proved to be a very popular free event. We had well over a 100 people attend which was a mixture of customers, a few Business partners and some IBMers.
10:00 - Power Systems Update - Pat O'Rourke: Austin Briefing Centre, USA Download 22MB .pdf
11:15 - Performance Best Practices with POWER7 - Nigel Griffiths, ATS Europe ... [More]
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]
I am getting asked more about security these days than in the previous decade - perhaps there is renewed focus on this area as we hear about hacker groups taking what they want from organisations and companies in the News every day. Below is an answer I gave to a recent email question on what AIX offers on the security side, spotting vital files being changed and what parts of PowerSC to use for quick wins.
For AIX security the three big hitters for "out of the box" AIX hardening are:
Ditch telnet/ftp in the... [More]
POWER Relative Performance (rPerf) is often used as a way to approximate the expected difference in performance between two Power Systems servers. Although rPerf is a useful tool, it is important to understand the limitations of using rPerf to provide an estimate the performance of your specific workloads in your particular environment with a new server, First, rPerf numbers, like any published benchmark, represent the best case result when the application, configuration and system resources are all optimized -- factors that are likely not... [More]
Just completed the move of the POWER and AIX Hands-on Movies to YouTube videos - after pruning we have 97 of them. This means you can watch them on your mobile Smartphone and Tablets in addition to your workstation/personal computer. You can find them all here:
YouTube look for my "Nigel Griffiths" Channel http://www.youtube.com/user/nigelargriffiths This should mean they are simpler to find, search for and view. During the transfer I pruned out a few of the older ones particular Systems 6.2 as we now have a set of Systems... [More]
Hot news this morning is IBM announcing the updating of the Lower End Power 710/730 and Power 720/740 models to include Power7+ processor with 2.5 larger L3 cache, Active Memory Expansion accelerator, and GHz boost Double the memory size This gives a large performance boost and drastically higher "bangs per buck" as the Americans say or "Value for money" as we Brits say. Almost everything else is the same so if you know the older models it is easy to understand Announcement letters for the new Power7+ models: Power 710 ,... [More]
Hi, Rob McNelly, the esteemed POWER7 Champion, sent me a really good questions and I thought would make a good blog as I get asked this about once a month. I have cut down the questions a but but it is a two parts: His customer is thinking about putting Systems Director on to their NIM server. Rob remembered me commenting on this but wants the details. They are planning to give it 1 dedicated Power7 core and 12G memory. What do I think about that? Answer 1: 2 years ago this combination (NIM & ISD) was not allowed ( I think it was just not... [More]