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
N-Port Id Virtualisation (NPIV) and virtual Fibre Channel adapters - like high speed physical adapters (see an earlier blog) do require memory to operator at full speed. NPIV effectively turns the Virtual I/O Server (VIOS) into a kind of virtual SAN switch where packets are passed through with no changes from the physical adapter to the client Virtual Machine (LPAR). I found it very hard to find a recommendation in the documentation but was given a rule of thumb. As before it should be noted that starving the VIOS and the Hypervisor of... [More]
I was just asked this question by customer and it got me thinking, Items I would include: WPAR takes seconds to create and LPARs minutes LPARs need setting VIOS LV or LUNs but WPARs add simpler NFS mount points, or can just use Global AIX diskspace options LPAR needs 512 to 1GB to boot AIX and a WPAR takes just ~60 MB (yes sixty megabytes) You can share application code say 1 GB in each and every LPAR (40 LPAR = 40 GB) or just one shared read-only copy for all WPARs 40 WPAR = 1 GB).This saves man-power in maintenance, disk space AND memory (if... [More]
I need to make it clear that these pictures are from an Early Ship Program machine which might vary a little from the final Generally Available (GA) models in November 2014. For example, missing labels or stickers plus colours of handles and parts etc. The engineering will be much the same.
Please see my 8 minute video of the machine on YouTube here:
POWER8 Enterprise - Power E870 First Look http://youtu.be/jOzPTopt7HE
These pictures were take by Gareth Coates and the... [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]
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]
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]
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?
A very nice chart from Richard Milton of IBM on the minimum levels for AIX and VIOS of Power7 and Power7+ hardware.
Download as a PDF: AIX_Levels_on_POWER7_Hardware_2013_06_20.pdf
We will try to update this as new machines arrive.
Having just done this and getting questions on it from customers, I thought I should share a few notes:
1) The process is nicely documented and you need to follow the instructions. I recommend using the Release Notes as a check list as missing out a stop causes the next bit for complain or fail. Fortunately, the recovery is just doing the bit I missed.
2) Read the Release notes - even better print them out and cross them off as you go:
http://www.ibm.com/support/docview.wss?uid=hpc1vios117f5701 - upgrade... [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]
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]
It has bee a long few weeks traveling to Dublin, Las Vegas, Slovenia, Germany and Sweden to give lots of presentations. Six Weeks and five countries and the expenses are piling up on my desk. I was presenting a core set of topics like POWER7+ announcement summary, VIOS Shared Storage Pools (SSP3), Workload Partitions (WPAR) and Versioned WPARs to run AIX 5.2 and AIX 5.3, quick introduction to PowerSC (security tools), a Techie "what you need to know about" Systems Director for AIX, and Quick Dips in to Active Memory Deduplication... [More]
So I got asked, just as an example configuration which forces lots of workload per CPU: Given a 16 CPU POWER machine and a need to run 100 workloads, would I recommend 100 LPARs or 100 WPARs? In case you are not familiar with POWER technology: LPAR = Logical Partition used the PowerVM to split CPU, memory and I/O across multiple virtual machines (also called virtual servers). The I/O is handles by a special purpose LPAR called the Virtual I/O Server, which provides virtual network, virtual disks, virtual optical and virtual tape. Each LPAR has... [More]