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Gathering performance data with sysstat

December 15, 2011 October 8, 2019 / By Eberhard Pasch / Linux / Leave a Comment

The sysstat package is included in all distributions but not always installed by default. It’s a collection of performance monitoring tools and you can check the options for your current version in the manual pages. It’s platform independent and so … Read the rest

New whitepaper: “Sharing A WebSphere Application Server V8 Installation Among Many Linux for IBM System z Servers”

December 13, 2011 May 3, 2019 / By Eberhard Pasch / Uncategorized / Leave a Comment

In the new white paper “Sharing A WebSphere Application Server V8 Installation Among Many Linux for IBM System z Servers” you find a hands on description on a more complex WAS server setup. This is the update of the white … Read the rest

New Redpaper: “Installing Oracle 11gR2 RAC on Linux on System z”

December 13, 2011 May 3, 2019 / By Eberhard Pasch / Uncategorized / Leave a Comment

This Redpaper describes the installation of the latest Oracle DB on RHEL 5 and SLES 11 for Linux on System z. It covers both ECKD as well as SCSI installations and on the Oracle side the Grid Infrastructure and RAC.… Read the rest

z/VM 6.2 – beyond SSI and LGR

December 5, 2011 May 3, 2019 / By Eberhard Pasch / Uncategorized / Leave a Comment

The main features in z/VM 6.2 are certainly Single System Image (SSI) and Live Guest Relocation (LGR). With that it’s now possible to have up to four z/VMs in one cluster and move the Linux guests from one to the … Read the rest

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

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  • Red Hat Enterprise Linux (RHEL) 8.3 released
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