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
RHEL (6.4 and 6.5) Servers show their PC heritage when you assign server style static IP addresses instead of home network DHCP controlled IP networks. [[That will generate a few comments!!]]
I find the /etc/resolv.conf file gets modified after a reboot and so DNS fails - this is a broken as designed feature. I would enjoy someone trying to defend this feature and why it does this for my benefit! [[That will generate a even more comments!!]]
I search the network and the comments are the... [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]
In the past with the POWER7 and POWER7+ based machines at the lower end like the Power710 to Power740 Models, users had to shut down the whole machine to add, remove or replace an adapter safely. In fact, some machines would power off as you removed the lid.
This is no longer the case with the whole POWER8 range including the Scale-Out Models like the S822 and S824. These machines do not have the blind swap cassettes which allow the adapters to be removed from the rear of the machine. So you must have the cable... [More]
Odd. I thought I have put this on this blog before but I can find it now so just in case ... here it is or here it is again.
The SSP4 can have mirrored failure group FC disks to handle adapter, FC cable, FC switch, entire FC disk sub-system, site or VIOS failure.
But there is still a single SSP Repository disk. Isn't this a single point of failure?
The answer is " No because you can quickly rebuild the contents of the Repository Disk after it has failed ."
You are not meant to know this... [More]
I was told that Fedora's latest build for the Power ppc64 processor would support SMT=8 , if you "err ... um" have machine with a processor that support that SMT=8 !!! This is not an announcement.
So I gave it ago - here is my report:
And I can't help thinking PowerVC would remove all this work, once the new version arrives that support my ... umm err! new machine!!
I can tell you know that this was a POWER8 S824... [More]
With Power Systems there are many ways to run your Operating System(s) and each has advantages and each has a different install process.
1 Native Headless Whole Machine Mode
Number of operating systems = 1
Operating Systems: AIX, IBM i, Linux
Console = RS232 Dumb terminal
Virtual Machines = none
Machine types = Blades, Power Systems or PowerLinux (only runs Linux, of course)
Can't make use of the Power hardware based virtualisation advantage.
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... [More]
Normally I recommended to go virtual:
I would recommend anyone trying a Power System or PowerLinux system to run it with a Hardware Management Console (HMC) -now called a Power Management Console - or using Integrated Virtualisation Manager (IVM = like HMC and VIOS combination as the first LPAR / VM).
This way you are using the full power of the Power based machines to run LPARs / Virtual Machines and push higher utilisation and extra flexibility.
But if you must go commando!
But some what to ignore... [More]
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]
If you have:
High-end Power 770, Power780 or Power 795 machines
With Capacity Upgrade on Demand (CUoD)
More than 4 CPU cores and 32 GB RAM which are not Activated (dark)
... then you are ready for Power Integrated Facility for Linux (IFL) - which is a offers a package of 4 cores and 32 GB of memory at a special low price (given the resources, you can order more than one IFL)
includes the PowerVM license and PowerVM SWMA for the newly activated CPU cores
excludes a Linux license... [More]
Please provide comments on this blog entry - I want to know where I have it wrong?
With IBM's massive investment in Linux on Power my brain hurts trying to express the advantages. This is because the technology is excellent but the bits you want depend on where you are coming from. So I have tried to break out potential users in to various types.
For the record I am an Ab Linux on POWER User type!
A - Current AIX and POWER user
Already understands the POWER infrastructure, AIX and/or IBM i and are adding... [More]
I have been installing beta copies of PowerVC, the new IBM product which is available tomorrow 6th Dec 2013. It is quick to install and allows rapid rolling out of new virtual machines to a group of physical Power machines from your list of pre-packaged software images in just a few seconds of your time and roughly 2 to 3 minutes elapse time till you can login and use it. PowerVC is based on OpenStack which has lots of modules to install and configure. It is installed on Red Hat Enterprise Linux RHEL 6.4 on Power or x86 - So it is a... [More]
*** STOP PRESS *** - See the update in red at the bottom.
I was asked this lots of times at the recent POWER Technical Universities in Orlando and Athens.
Compared to a low numbers of local disks
The LUNs on a SAN disk subsystem with caching are very fast - even a simple test like AIX install times have halved. In addition, you don't have to fiddle about with stripping AIX Logical Volumes across disks or retro fit this to rootvg Volume Group filesystems after the install.
Compared to a... [More]
IBM announced lots of Power Systems software yesterday but the official announcements are pretty thin on the details. I have many Twitter tweets asking "What the heck does that all really mean?" and the official statements are marketing messages and not technical information like:
How do you get that working?
What are the pre-reqs?
What are the actual commands?
What does the Graphical User Interface look like?
How does that help me as a System Admin person?
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 126.96.36.199 C F AIX 5.2 Versioned WPAR Runtime
vwpar.images.52 188.8.131.52 C F Versioned WPAR 5.2 Support
vwpar.images.53 184.108.40.206 C F Versioned WPAR 5.3 Support
vwpar.images.base 220.127.116.11 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
When I log on to my home machine being AIX,of course, and type hostname I get:
nag@blue:/home/nag$ hostname -s
I get this because when I set the hostname in smitty it looks like this:
* HOSTNAME [ blue.aixncc.uk.ibm.com ]
* Internet ADDRESS (dotted decimal) [18.104.22.168]
Network MASK (dotted decimal) ... [More]
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]
I regularly get asked a question like: I have 4 months of data from 25 machines and have to develop a Capacity Planning model to size these LPARs on to new machines but I am having problems with having so much data. What can you recommend? We need graphs of
CPU compared to Entitlement
CPU Physical CPU use
Maximum real memory use
Sometimes this data is needed as input in to the Workload Estimator tool or Server Consolidation tools.