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SMT: What utilization in real?

March 1, 2021 March 1, 2021 / By Eberhard Pasch / Hint and Tips / Leave a Comment

Simultaneous Multithreading (SMT) has been introduced to improve the throughput per core. In system Z if only one thread is running, the performance is very close to this of a single thread environment. In your data center you have most … Read the rest

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Red Hat Enterprise Linux (RHEL) 8.3 released

October 30, 2020 November 17, 2020 / By Eberhard Pasch / Linux Distributions, Red Hat / Leave a Comment

On October 29th, 2020 Red Hat announced RHEL 8.3 the third service pack for their leading enterprise version. As soon as your middleware and application are available for RHEL 8 please plan for migration from older releases. 

The kernel level … Read the rest

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SUSE Linux Enterprise Server 15 SP2 (SLES15 SP2) released

July 22, 2020 August 5, 2020 / By Eberhard Pasch / Linux Distributions, SUSE / Leave a Comment

On June 21th 2020 SUSE announced SLES15 SP2 the second service pack SLES 15.  With it’s kernel upgrade it contains many new features for System Z:

  • z15 support 
    • compiler (-march=z15), binutils, gdb support new instructions
    • full zlib acceleration support 
… Read the rest
z15 T02

z15 T02 / LinuxONE III LT2

June 15, 2020 June 15, 2020 / By Eberhard Pasch / Hardware / Leave a Comment

On April 14th IBM announced the new z15 T02 the successor for the z14 ZR1. At the same time also the LinuxONE III LT2 the successor for the LinuxONE Rockhopper II was announced. Both machines are based on … Read the rest

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Red Hat Enterprise Linux (RHEL) 8.2 released

April 28, 2020 July 18, 2020 / By Eberhard Pasch / Linux Distributions, Red Hat / Leave a Comment

On April 21st, 2020 Red Hat announced RHEL 8.2 the second service pack for their new enterprise version. With the transition of RHEL 7.8 to Maintenance Mode 2 this is now the premier enterprise distribution. 

The kernel level for 8.2 … Read the rest

Red Hat Enterprise Linux (RHEL) 7.8 released

April 1, 2020 July 18, 2020 / By Eberhard Pasch / Linux Distributions, Red Hat / Leave a Comment

On March 31th, 2020 Red Hat announced RHEL 7.8 the next regular update to their flag ship operating system. This the successor of RHEL 7.7. With this release in August RHEL 7 transitions to Maintenance Support 2 phase. So … Read the rest

compression

zlib acceleration

January 24, 2020 January 18, 2021 / By Eberhard Pasch / Hardware, Linux / Leave a Comment

With the z15 the CPU in System Z has gotten the ability to compress data into the zlib format really fast. The feature is officially called Integrated Accelerator for zEnterprise Data Compression (zEDC). This is know as zlib acceleration. Of … Read the rest

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SUSE Linux Enterprise Server 12 SP5 (SLES12 SP5) released

December 20, 2019 December 20, 2019 / By Eberhard Pasch / Linux Distributions, SUSE / Leave a Comment

On December 9th 2019,  SUSE announced SLES12 SP5 the follow up service pack after SLES 12 SP4.  This release is the last service pack of SLES12. The new features for System Z include:

  • First z15 support in compiler, binutils
… Read the rest

Secure Boot / Secure IPL

December 4, 2019 April 29, 2020 / By Eberhard Pasch / Hardware, Hint and Tips, Linux / Leave a Comment

The new IBM z15 / LinuxONE Emperor III introduced the possibility for an operating system to boot in a secure fashion. The chain of trust is verified from the hardware throughout the whole firmware up into the operating system. Right … Read the rest

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Red Hat Enterprise Linux (RHEL) 8.1 released

November 16, 2019 March 2, 2020 / By Eberhard Pasch / Linux Distributions, Red Hat / 2 Comments

On November 6th, 2019 Red Hat announced RHEL 8.1 the first service pack for their new enterprise version. 

The kernel level for 8.1 is kernel-4.18.0-147.el8. This is a bug fix and feature release. On System Z RHEL 8.1 is better … Read the rest

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Recent Posts

  • SMT: What utilization in real?
  • Red Hat Enterprise Linux (RHEL) 8.3 released
  • SUSE Linux Enterprise Server 15 SP2 (SLES15 SP2) released
  • z15 T02 / LinuxONE III LT2
  • Red Hat Enterprise Linux (RHEL) 8.2 released
  • Red Hat Enterprise Linux (RHEL) 7.8 released
  • zlib acceleration
  • SUSE Linux Enterprise Server 12 SP5 (SLES12 SP5) released
  • Secure Boot / Secure IPL
  • Red Hat Enterprise Linux (RHEL) 8.1 released

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  1. SUSE Linux Enterprise Server 12 SP5 (SLES12 SP5) released
  2. z/Architecture Principles of Operations
  3. zlib acceleration
  4. z15
  5. SUSE Linux Enterprise Server 15 SP1 (SLES15 SP1) released

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The postings on this site are my own and don’t necessarily represent my employer’s positions, strategies or opinions.

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