Archive for the ‘Linux’ Category

End of Maintenance for Redhat Linux Distributions

Thursday, November 11th, 2010

Red Hat Enterprise Linux 6
General Availability : November 10, 2010
End of Production 1 : Q4 of 2014
End of Production 2 : Q4 2015
End of Production 3 : November 30, 2017 [End of Regular Life Cycle]
End of Extended Life Cycle : November 30, 2020

Red Hat Enterprise Linux 5
General Availability : March 15, 2007
End of Production 1 : Q4 2011
End of Production 2 : Q4 2012
End of Production 3 : March 31, 2014 [End of Regular Life Cycle]
End of Extended Life Cycle : March 31, 2017

MaxDB : SAP Re-Installation

Monday, August 9th, 2010

Clean up the following File Systems or DIRs
> /etc/opt/sdb
> /usr/spool/sql
> /sapdb/*

This Time Of The Year

Sunday, August 8th, 2010

This time of the year, I dealt with a combination of Redhat Linux 5.5, MaxDB[7.7 and 7.8] and obviously SAP on top running on VMWare ESX 4.1 with IBMs hardware plus NetBackup-6.5.4.

ERP 6.4 / NW7.01
PI 711
SOLMAN 701
Redhat Cluster Suite [RHCS]
MaxDB
NetBackup

Busy time, but I will try to share my experience with those terrific combination.

Red Hat Enterprise Linux 6 Beta Released

Thursday, April 22nd, 2010

Red Hat Enterprise Linux 6 enters Beta-1 today!. The next generation of the Red Hat Enterprise Linux platform.
If you are interested in trying the Beta, download available.

Red Hat Enterprise Linux 6 blurs the lines between virtual, physical, and cloud computing to address shifts taking place in the modern IT environment.

The following are some of the many improvements and new features that are included in Red Hat Enterprise Linux 6 Beta:

Power management: tickless kernel and improvements through the application stack to reduce wakeups, power consumption measurement by Powertop, Power Management (ASPM, ALPM), and adaptive system tuning by Tuned, all enhance more efficient system power usage.

Next generation networking: comprehensive IPv6 support (NFS 4, CIFS, mobile support [RFC 3775], ISATAP support), FCoE, iSCSI, and a new and improved mac 802.11 wireless stack.

Reliability, availability, and serviceability (RAS): system-level enhancements from industry collaborations make the most of hardware RAS capabilities and NUMA architectures.

Fine-grained control and management: improved scheduler and better resource management in the kernel via Completely Fair Scheduler (CFS) and Control Groups (CG).

Scalable filesystems: ext4 file system provides support for larger file sizes and significantly reduces repair times over ext3. XFS® is a high-performance file system that supports extremely large files and is optimized for large data transfers.

Virtualization: KVM includes performance improvements and new features, sVirt protects the guest and host from unauthorized access, SR-IOV and NPIV deliver high-performance virtual use of physical devices, and libvirt leverages kernel resource management functionality.

Enterprise security enhancement: SELinux includes improved ease of use, application sandboxing, and significantly increased coverage of system services, while SSSD provides unified access to identity and authentication services as well as caching for off-line use.

Development and runtime support: SystemTap improvements, ABRT is a new framework for simple collection and reporting of bug information, and improvements are made to GCC (version 4.4.3), glibc (version 2.11.1), and GDB (version 7.0.1).

View the full release notes in detail.

SAP Troubled Kernel Patch

Sunday, January 31st, 2010

Next time when the system starts sneezing or coughing with the following symptoms:
The dialog work process may crash sporadically when you reprint from the graphic display of a spool request from transaction SP01. The same problem may also occur for the raw display of a spool request. When you forward or download a spool request, a dump ASSIGN_TYPE_ILLEGAL_CAST occurs in the function RSPO_SPOOLDATA_WRITE.

Check for the following Kernel Patch level for the respective release:

SAP KERNEL 7.00 32-BIT SP239
SAP KERNEL 7.10 32-BIT SP184
SAP KERNEL 7.00 64-BIT SP239
SAP KERNEL 7.00 64-BIT UNICODE SP239
SAP KERNEL 7.10 64-BIT UNICODE SP184
SAP KERNEL 7.10 64-BIT SP184
SAP KERNEL 7.01 64-BIT SP077
SAP KERNEL 7.01 64-BIT UNICODE SP077
SAP KERNEL 7.11 64-BIT SP071
SAP KERNEL 7.11 64-BIT UNICODE SP071

Please do not apply the following kernel patches which have been created between 23.12.2009 and 14.01.2010:
6.40 315
7.00 237, 238
7.01 75, 76
7.10 183
7.11 69, 70

    The following fixed kernels are available:

6.40 Check OSS
7.00 239
7.01 77
7.10 183
7.11 71

Also check the following notes:
Note 1422843 - Wrong deletion date in spool request
Note 1425811 - Dialog work process crashes for spool display

SAP Standard Job Changes

Friday, December 12th, 2008

Certain jobs that were delivered as standard jobs in the past are no longer recommended by SAP.

1. The following job definitions are deleted:
SAP_REORG_UPDATERECORDS
(program RSM13002)
SAP_WP_CACHE_RELOAD_FULL
(program RWP_RUNTIME_CACHE_RELOAD)

2. The following job definitions are changed:
SAP_REORG_JOBS
(old: program RSBTCDEL, new: program RSBTCDEL2)
(Note: From a technical point of view, this is not a change, but rather the old job definition is deleted and a new job definition is created.)

3. The following job definition is new:
SAP_REORG_ORPHANED_JOBLOGS (program RSTS0024)

SAP on Linux

Monday, September 17th, 2007

I was at my Chennai office to conduct training and I called it as “SAP on Linux
I started by Thursday for two days training, to meet some of my counterparts and friends out there.

The class was packed with around 20 new joiners, who have just started to venture into SAP Basis. I started my session by keeping in mind: On the long run; if they have to make a choice between Windows and Linux/UNIX on SAP, there wouldn’t be a second thought to have the fun with Linux.

I picked up RedHat Linux for the demo session; since I had deployed FIVE SAP systems at my Bangalore office and they are running well on RedHat AS-4 and CentOS-5 [The number FIVE really matters for me]

I would like to paste the contents of some of the important slides:

    0.ENV_VARIABLE settings :

On Bash shell before you run ./sapinst as root


• JAVA_HOME=/opt/java1.4;
export JAVA_HOME
• SAPINST_JRE_HOME=/opt/java1.4/jre;
export SAPINST_JRE_HOME
• PATH=$PATH:/opt/java1.4/bin;
export PATH
• PATH=$PATH:/opt/java1.4/jre/bin;
export PATH

    1. Aditional Package Information for RHEL-4

: rpm -ivh

• glibc-2.3.4-2.9.x86_64.rpm
• kernel-smp-2.6.9-42.EL.x86_64.rpm [The kernel patch is important]
• glibc-common-2.3.4-2.9.x86_64.rpm
• mkinitrd-4.2.1.6-1.x86_64.rpm
• IBMJava2-AMD64-142-SDK-1.4.2-7.0.x86_64.rpm [For Java]
• saplocales-2.3.4-3.x86_64.rpm
• libaio-0.3.103-3.x86_64.rpm‎ [To avoid Oracle: error while loading Libraries libio.so.1 ]

    3. Important SAP Notes

• Red Hat Enterprise Linux 5: Installation and Upgrade (Note 1048303)
• Red Hat Enterprise Linux 3 and 4: Installation and upgrade (Note 722273)

I packed up on Sunday night after the fun with the same ‘ol feelings; Chennai, it’s still not a classic rock


Tail:
Closely an year back at the same workplace: My first CRM installation on “ ONE ” server out of 30 other running SAP servers.
I proposed to do it on Linux, but it didn’t happened since the senior was comfortable with Windows-2003. I said to myself “My call is not too far but FAR and the count started from FIVE

    Current Music:- The temple of the king by Rainbow -

Xen: I am a para-virtualized one!

Thursday, September 6th, 2007

The party over and my virtual machine is ready for topping with SAP.

One point: I have done a kernel upgrade from 2.6.18-8 to 2.6.18-8.1.8 at the guest OS level; in fact the dom0 machine too.

Heck with, I wanna know what would happen if I use the normal kernel on my PV/guest_OS and I change the default kernel-2.6.18-8.1.8.el5xen to kernel-2.6.18-8.1.8.el5 :)

[fubar@blxvirtual ~]# xm reboot cenos5v

screwed! [Didn’t came up]

Later I have resolved the issue. All I have done

mount my image

[foobar@blxvirtual sagar]# lomount -diskimage /var/lib/xen/images/cenos5v.img -partition 1 /vipin

[foobar@blxvirtual sagar]# cd /vipin/grub/grub.conf

change default 1 to 0 :)

Happy Xenning around !!!

Xen, Let’s do it

Sunday, September 2nd, 2007

Its been another work-around and Xen is the opted card I chose to play.

Making a virtualized environment on CentOS-5 [final] linux distro and SAP on top of both.

Happy Xenning around!!!

Let There be Light and Freedom

Tuesday, August 14th, 2007

I was interested to make some points which I mentioned below at work-place, and I was not satisfied with the way it went

and I named : Let There be Light and Freedom

“First they ignore you, then they laugh at you, then they fight you, then you win.”
-M K Gandhi

I am not here for any Anti-Microsoft-ism or a flame war, but the happenings and the hot keywords buzzing around, Linux, Open Source, Virtualization and Total Cost of Ownership [TCO].

    Linux: The Choice of Freedom

Today Linux is being used everywhere. Linux has proved it’s suitability for every workload–even the largest, most business-mission critical applications. Its security, performance and economic benefits can be applied to every level in the IT infrastructure. On the other hand Open source is powerful and it’s un-stoppable. The major Linux vendors like Red Hat and Novell/SUSE Linux are built on the open standards.

Of course, Linux dominates. The quality of Open Source software is well established. The Figure 1 shows the ranking of most available servers on the Internet.

    OpenSource Rules: Open Source is powerful. Open Source is unstoppable

According to “Wiki” the online encyclopedia, Open source is a set of principles and practices that promote access to the design and production of goods and knowledge. The term is most commonly applied to the source code of software that is available to the general public with relaxed or non-existent intellectual property restrictions. This allows users to create software content through incremental individual effort or through collaboration.

Another important point to note that Open Source software differs significantly from “freeware”. Freeware is software distributed without a fee, but without source code access but Open Source software allows anyone to inspect, identifies, and resolve flaws in the code.

The Open Source model doesn’t hide its code like Microsoft which claims that secret code is more secure. Although that seems reasonable at first glance, in reality it is patently false. When I heard this statement for the first time, I took a little while for a conclusion. Hundreds of thousands of Open Source developers, testers, bug-fixers and maintainers work as a community around the globe to make sure the flexibility, innovation, reliability, faster development of the project they working on. Sourceforge.net, a leading website for Open Source software, hosts over 130,000 projects and has 1.4 million registered users. This power exceeds that of even the mightiest proprietary software company. What would be your conclusion, by seeing the Figure 2 – Open Source movement.

    Virtualization: Many to One

Virtualization is a technology with wide range of options to improve the usage of the hardware resources and greater potentials to reduce the Total Cost of Ownership [TCO]. All most all Linux distribution now bundled with virtualization capabilities and Microsoft may have it’s built in server virtualization technology with the upcoming Windows Server-2008. Now in the market with their Microsoft Virtual Server 2005 R2

Why do we require virtualization technique and how does it reduce the cost.
Think about a business model which requires to develop and test its business applications on different platforms, which in turn required different hardware, its administration, space requirement at datacenter or inside a server rack. How do you feel if all these platform and test environment in one hardware with same performance? I think this simplifies and accelerate the productivity with low power usage. That is what virtualization does.

The most common virtualization technologies are:
0. Operating System Virtualization
1. Server Virtualization
2. Desktop Virtualization
3. Application Virtualization
4. Storage Virtualization

The major players of virtual machines are XEN, KVM and VMware with their own pros and cons.

Redhat and SUSE Linux run their Para-virtualization technology on Xen, an open source virtual machine system.

    TCO: Total Cost of Ownership

The decision makers and the IT managers of an organization consider the fact and myth about TCO, when they venture into any kind of technology deployment. This is critical and important because it’s a long term deal with the technology. Hope you might have seen the Microsoft Ad campaign/survey over the internet named “Get the Fact” Microsoft Vs Linux over TCO.

If you have already seen or ever get a chance to read about Get the Fact whitepapers in future, would you consider the following “facts”

The study NOT talk about Client Access License [CAL], the key section of a product’s licensing cost. Linux doesn’t charge you a license fee for every user accessing the server like Microsoft does.

Redhat Linux says, their subscriptions are not tied to a machine. When the hardware requirements change, Redhat subscription can be transferred to a replacement or a new machine for no additional cost. For one annual subscription, the customer gets access to the technology, documentation, updates, upgrades and un-limited technical support.

According to Novell’s Suse Linux, the figures are based on a subscription fee of $50 for Suse Linux Enterprise Desktop [SLED], compared to $299 for a Windows Vista license, as well as additional maintenance fees of $86 for Vista Business. SLED costs $50 for one year and $125 for three years, compared to Vista’s $385 for one year and $557 for three years. Add in the fact that Novell’s SLED contains a version of the OpenOffice.org, an OpenSource office productivity suite while Microsoft Office costs an additional $400 to $500.

When the Robert Frances Group study, titled “TCO For Application Servers: Comparing Linux With Windows And Solaris” and commissioned by IBM, compared the cost of acquiring, implementing, and running an application server on Linux, Windows, and Sun Solaris, it found that Linux is 40% less expensive than a comparable x86-based Windows server and 54% less than a comparable Sparc-based Solaris server. The Linux server’s costs were $40,149, compared with $67,559 for Windows and $86,478 for Solaris.
Never follow the summary or wacky ads of a survey. Make sure you have got the information that how the authors collected and analyze the data on what basis. Does that really mean to your organization and technology. And finally who sponsored the survey, was it biased.

Conclusion:

Where do we see the world of OpenSource and Linux stand by today? If you still feel the darkness around you, all I have to say: Let there be light and freedom.

Reference:

0. Official Redhat linux website http://www.redhat.com/rhel/resource_center/
1. Novell Suse linux website http://www.novell.com/linux
2. Frances Group study, titled “TCO For Application Servers: Comparing Linux With Windows And Solaris” and commissioned by IBM.
3. Online encyclopedia, Wiki. http://en.wikipedia.org/wiki/Portal:Free_software
4. Succeeding with Open Source by Bernard Golden
5. The Practical Manager’s Guide to Open Source by Maria Winslow