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How to find software solutions for Linux on System z

December 1, 2011 May 3, 2019 / By Eberhard Pasch / Uncategorized / Leave a Comment

There are multiple sources for finding middleware and solutions for Linux. As the web sites get updated this may change – let me know then I adapt the description.
Please note that none of those catalogs is complete, they are … Read the rest

Why doesn’t the Linux iowait show up as busy time in the virtualization layer?

November 28, 2011 May 3, 2019 / By Eberhard Pasch / Uncategorized / Leave a Comment

When a process in Linux has issued an IO and is waiting for a response there are basically two different possibilities. The good case is that there is other work pending and the CPU can continue to work. If there … Read the rest

VDSO – what is this?

November 11, 2011 May 3, 2019 / By Eberhard Pasch / Uncategorized / Leave a Comment

(updated 3/12/2013)

Virtual Dynamically-linked Shared Object (VDSO) is a shared library provided by the kernel. This allows normal programs to do certain system calls without the usual overhead of system calls like switching address spaces.

For … Read the rest

OCFS2 support for Linux on SLES

November 8, 2011 May 3, 2019 / By Eberhard Pasch / Uncategorized / Leave a Comment

Recently there has been quite some discussion around the support for OCFS2. SUSE has published their support statements in two blog entries:

  • the first one from November 2nd talks mainly about Linux on System z support
  • the second one
… Read the rest

Using cio_ignore under z/VM

October 28, 2011 May 3, 2019 / By Eberhard Pasch / Uncategorized / Leave a Comment

More and more installation tools use the cio_ignore kernel parameter. This parameter has been developed to allow hiding of devices from Linux, especially when using production Linux systems in LPAR.
The approach used in installers / automation systems is to … Read the rest

Methods to pause a z/VM guest: Optimize the resource utilization of idling servers

October 10, 2011 May 3, 2019 / By Eberhard Pasch / Uncategorized / Leave a Comment

The startup time for servers increased during the last years. So even for development and test servers it’s now common to either let them run or pause them. On z/VM with Linux on System z there are two different methods … Read the rest

Bug fix for Linux on System z extensive swapping

October 7, 2011 May 3, 2019 / By Eberhard Pasch / Uncategorized / Leave a Comment

Recently there has been a small bug fix for the swap behavior of Linux on System z. The following problem has been observed by several users:

The first time Linux started swapping it was doing so really extensively even though … Read the rest

Oracle 11g R2 – RMAN compression eating up CPU resources

October 2, 2011 June 10, 2019 / By Eberhard Pasch / Uncategorized / Leave a Comment

There have been several complaints with respect to the RMAN CPU usage on Linux on System z. At the bottom of this was always the use of the ‘BASIC’ compression method in RMAN.
So if your CPU is also too … Read the rest

Which Distribution is supported on which hardware?

September 22, 2011 May 3, 2019 / By Eberhard Pasch / Uncategorized / Leave a Comment

A frequently asked question for Linux on System z is which distributions are supported with what hardware. There are two different sources for this:

  1. IBM is publishing tested platforms
  2. The distributors publish their hardware certifications
    • On the Red Hat page
… Read the rest

Interesting performance presentations at SHARE Orlando 2011

September 21, 2011 May 3, 2019 / By Eberhard Pasch / Uncategorized / Leave a Comment
Unfortunately I haven’t been able to attend the last SHARE conference. So I looked up the performance pitches in the proceedings for reference. Thanks to SHARE that they publish those. 
Linux: 
  • Linux on System z Distribution Performance Update
  • Linux Performance
… Read the rest
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