IBMi.org – Bart's blog

IBM i and PowerVM features and tools

Category Archives: POWER

CAPI on POWER systems

One of the biggest and the most spectacular news which I’ve experienced on my last residency, was the completely new technology called  Coherent Accelerator Processor Interface (CAPI). I was in big shock after a meeting with with the project leader. It sound for me as the holy grail for all I/O bandwidth and latency problems.

Read more of this post

Advertisements

SR-IOV technology on POWER – my few words

Finally the announcement day arrived. POWER8 and SR-IOV have been introduced to the world, and I can share my experience from my last residency.

Single Root I/O Virtualization are not new adapters, but this is a new technology, standard, specification. In fact, it uses adapters which are on the market for some time already. Specification allows to get a slice of a physical adapter and assign it an LPAR. This feature requires a proper hardware, firmware, and all elements around it.

Read more of this post

Redbook residency – Austin 2014

Few days ago, I came back from IBM in Austin. It was my first time in Austin, homeland of POWER systems, chips, AIX and PowerVM development, but third residency in general. Read more of this post

viosvrcmd – the backdoor to the PHyp?

The title is provocative, but if we agree that Virtual I/O Server is part of the POWER Hypervisor it’s absolutely true. The command viosvrcmd is a HMC command which allows to perform any non-interactive VIO commands by a HMC user which has the taskrole authority – ‘VirtualIOServerCommand’ and visibility to a VIOS LPAR without be prompting for VIOS user and password.

Read more of this post

Monitor CPU, POOL utilization from PHYP cycles

It’s important to know a CPU capacity used by a system. In IBM i world, we have a licpgm – 5761PT1 Performance tools. But what if you run other OS’s than IBM i, on the same POWER box. Or you run LPARs in different shared processor pools ? The most efficient might be tracking CPU cycles dispatched by the POWER Hypervisor. In this post I show you, how to interpret performance data collected by a HMC, and how to allow IBM i collects and display dispatched CPU cycles.

Read more of this post

Triple backplane – discrepancy between Redbook vs offical doc

In a Redbook I found a pretty serious discrepancy about disk drive location, if you run a triple split backplane. Read more of this post

Triple Split Backplane – hardware configuration

It’s just a heads up how to configure a P7 hardware, if you want to have a triple split backplane.

Read more of this post