• IBM Consulting

    DBA Consulting can help you with IBM BI and Web related work. Also IBM Linux is our portfolio.

  • Oracle Consulting

    For Oracle related consulting and Database work and support and Migration call DBA Consulting.

  • Novell/RedHat Consulting

    For all Novell Suse Linux and SAP on Suse Linux questions releated to OS and BI solutions. And offcourse also for the great RedHat products like RedHat Enterprise Server and JBoss middelware and BI on RedHat.

  • Microsoft Consulting

    For Microsoft Server 2012 onwards, Microsoft Client Windows 7 and higher, Microsoft Cloud Services (Azure,Office 365, etc.) related consulting services.

  • Citrix Consulting

    Citrix VDI in a box, Desktop Vertualizations and Citrix Netscaler security.

  • Web Development

    Web Development (Static Websites, CMS Websites (Drupal 7/8, WordPress, Joomla, Responsive Websites and Adaptive Websites).

31 March 2012

Citrix Silver Partner as of now!

As of this week I am officially a:

Citrix logo

As a Solution Advisor, I’ll work sideby-
side with customers to plan, design, implement and maintain
Citrix virtualization, networking and cloud solutions.

There are many virtualization solutions on the market and it is very difficult to choose the right solution for your self without a good overview of the pro's and con's of each solution. As a special service to you I did find the right tool for you to make a self assessment that can help you with your first choice and selection of products on the market today. 

Take a look at this short video to get a first impression of the pro's and con's of a few solutions that are on the market today!

For a first step in your selection process please look for yourself here:

If you need further assistance and more guidance please contact me at:


21 March 2012

Oracle has new Templates for RAC

Oracle VM Templates
Oracle Real Application Clusters (RAC) 11g  Release 2 (x86 32-bit & 64-bit)
With Oracle 11gR2 RAC templates you can now create a RAC cluster in less then an hour!

Also now you can have live migrations with RAC.
Oracle RAC is an option to the award-winning Oracle Database Enterprise Edition. Oracle RAC is a cluster database with a shared cache architecture that overcomes the limitations of traditional shared-nothing and shared-disk approaches to provide highly scalable and available database solutions for all your business applications. Oracle RAC is a key component of the Oracle Enterprise grid architecture.
The templates provide an easy and fast way of deploying an Oracle RAC cluster in Oracle VM for test as well as production environments. The templates are designed to build clusters of any number of nodes, while by default a 2-node cluster is created. The templates are available in the following versions:
1. Oracle RAC 11g Release 2, including Oracle Grid Infrastructure Bundle Patch #2 and Oracle Database Patch Set Update #2 (, available via Oracle Oracle Software Delivery Cloud
2. Oracle RAC 11g Release 2, including Oracle Grid Infrastructure Bundle Patch #2 and Oracle Database Patch Set Update #4 (, available via Oracle Oracle Software Delivery Cloud
3. Oracle RAC 11g Release 2, including Oracle Grid Infrastructure Patch Set one (, available from My Oracle Support under Patch number 10113572 for 32-Bit & 64-Bit Linux
4. Oracle RAC 11g Release 2, including Oracle Grid Infrastructure Patch Set one Update #2 (, available from My Oracle Support under Patch number 11836831 for 32-Bit & 64-Bit Linux
5. Oracle RAC 11g Release 2, including Oracle Grid Infrastructure Patch Set two (, available from My Oracle Support under Patch number 12694014 for 32-Bit & 64-Bit Linux

For more information about the latest Oracle Grid Infrastructure and Oracle VM templates for Oracle RAC refer to My Oracle Support note ID 1185244.1
The entire installation is automated, requesting minimal information (e.g. node names, IP addresses, etc.) from the user when guests are booted. Fully automated builds directly from Dom0 are also possible, including automated network setup for all VMs. The final cluster configuration adheres to the best practices for production systems (assuming the production implementation was chosen) as described in the "Oracle Real Application Clusters in Oracle VM environments" technical white paper.
Template Highlights
         The Oracle VM templates use a minimal installation of Oracle Linux 5.4, 5.5, 5.6 or 5.7 system images for either 32-bit or 64-bit. Only basic RPM packages are installed.
         The Oracle VM templates can be used to build clusters of any number of nodes using Oracle Database 11g Release 2, which includes Oracle 11g Rel. 2 Clusterware, Oracle 11g Rel. 2 Database, and Oracle Automatic Storage Management (ASM) 11g Rel. 2, patched to the latest, recommended patches.
         The environment comes loaded with Swingbench, Oracle Cluster Health Monitor, OS Watcher, and more tools.
         During the installation process an Oracle RAC database instance is created on all nodes by default.
         Any number of nodes or instances can be added or removed from the cluster using a single command.

Template Documentation
         Oracle Database 11g Rel. 2 
+ Patch Updates (
         For Test Environments
         For Production Environments

         Oracle Database 11g Rel. 2 
+ Patch Updates (
         For Test Environments
         For Production Environments

         Oracle Database 11g Rel. 2
+ Patch Set one (
         For Test Environments
         For Production Environments

         Oracle Database 11g Rel. 2
+ Patch Set one Update#2 (
         For Test Environments
         For Production Environments

         Oracle Database 11g Rel. 2
+ Patch Set two (
         For Test Environments
         For Production Environments

Related Technology
          Oracle Clusterware
             Cluster Verification Utility - Download
             Cluster Health Monitor - Download

Oracle Software Delivery Cloud Instructions:
            Visit http://edelivery.oracle.com/oraclevm
         Complete your registration information (Name, Company Name, Email Address and Country) and click on the download agreement
         Select "Oracle VM Templates" from the "Select a Product Pack" pull-down menu
         Select "x86 32-bit" or "x86 64 bit" from the "Platform" pull-down menu
         Click "Go" and then select from the list of Oracle VM Templates
         Download and unzip the files and read the readme
                  Note: For large downloads, or for functionality such as download resuming, the use of a download manager is highly recommended.

20 March 2012

Another new enhancement to Oracle Ubreakable Linux is OCFS2

OCFS2 - Oracle Cluster File System for Linux

OCFS2 (Oracle Cluster File System 2) is a free, open source, general-purpose, extent-based clustered file system which Oracle developed and contributed to the Linux community, and accepted into Linux kernel 2.6.16.

Unlike stated in the table below, OCFS2 is available in SUSE Linux Enterprise Server (where it is the primarily supported shared cluster file system), CentOS, Debian GNU/Linux, and Ubuntu Server Edition. Oracle also provides packages for Red Hat Enterprise Linux (RHEL).

Building on Oracle's long-term commitment to the Linux and open source community, OCFS2 provides an open source, enterprise-class alternative to proprietary cluster file systems, and provides both high performance and high availability. OCFS2 provides local file system semantics and it can be used with any application. Cluster-aware applications can leverage cache-coherent parallel I/O for higher performance, and other applications can make use of the file system to provide a fail-over setup to increase availability.
Most Complete, Open, Integrated Enterprise Software Stack for Linux
OCFS2 is among the many key Oracle value-added technologies in Oracle Linux, and Oracle VM uses OCFS2 as its cluster filesystem to host virtual machine images, as well as the OCFS2 heartbeat to handle high availability. Only Oracle delivers the most complete, open, integrated enterprise software stack for Linux, including database, middleware, applications, and virtualization.
That it is a really great contribution and widely appreciated you can read from this comment from Google:
"This is a vital contribution to the open source community. The endorsement of OCFS2 by the Linux community represents a significant milestone for Oracle and demonstrates how Oracle's continued contributions are driving adoption of open source technologies." - Andrew Morton, Linux Kernel Maintainer, Google

Availability/Support From Oracle
Oracle Linux 6.0
ocfs2 version 1.6.3 (Using the Unbreakable Enterprise Kernel)
ocfs2-tools version 1.6.4 (default)
Oracle Linux 5.6
ocfs2 version 1.6.3 (Using the Unbreakable Enterprise Kernel)
ocfs2 version 1.4.8 (alternative kernel)
ocfs2-tools version 1.6.3 (default)
Technical Specifications (OCFS2 version 1.6)
Supported Platforms
x86, x86_64
Supported Operating Systems
Oracle Linux, RHEL (OCFS 1.4.8 only)
Block Size
from 512 bytes to 4KB
Cluster Size
from 4KB to 1MB
Max File Size
Max number of subdirectories
Max number of addressable clusters
2^32 (a future release will increase the limit to 2^64)
Max Filesystem Size
4PB* (1MB cluster size)
Version Compatibility
Compatibility between OCFS2 versions
OCFS2 strives for backwards compatibility with older versions. OCFS2 Release 1.6 is fully compatible with OCFS2 Release 1.4 or 1.2. A node with the new release can join a cluster of nodes running the older file system.
OCFS2 Release 1.6 is on-disk compatible with OCFS2 Release 1.2. However, not all the new features are activated by default; users can enable and disable features as needed using tunefs.ocfs2. The latest version of ocfs2-tools supports all existing versions of the file system.

OCFS2 Features

Variable Block and Cluster sizes
Supports block sizes ranging from 512 bytes to 4KB and cluster sizes ranging from 4KB to 1MB.

Extent-based allocations
Tracks the allocated space in ranges of clusters making it especially efficient for storing large files.

Metadata Checksums
Ensures integrity by detecting silent corruption in meta-data objects like inodes and directories. The error correction code is capable of fixing single-bit errors automatically.

Extended Attributes
Supports attaching an unlimited number of name:value pairs to the file system objects like regular files, directories or symbolic links.

Advanced Security
Supports POSIX ACLs (Access Control Lists) and SELinux attributes in addition to the traditional file access permission/ownership model.

Supports user and group quotas.

File snapshots – REFLINK
This feature allows a regular user to create multiple, write-able snapshots of regular files. The snapshot created is a point-in-time image of the file that includes both the file data and all its attributes (including extended attributes). The file system creates a new inode with the same extent pointers as the original inode. Multiple inodes are thus able to share data extents. Because of this, creating a REFLINK snapshot requires very little space initially. It grows only when a snapshot is modified, using a copy-on-write mechanism. REFLINK works across the cluster.

Supports both ordered and writeback data journaling modes to provide file system consistency in the event of power failure or system crash.

Ordered Journal Mode
This new default journal mode (mount option data=ordered) forces the file system to flush file data to disk before committing the corresponding meta-data. This flushing ensures that the data written to newly allocated regions will not be lost due to a file system crash. While this feature removes the ever-so-small probability of stale or null data to appearing in a file after a crash, it does so at the expense of some performance. Users can revert to the older journal mode by mounting with data=writeback mount option. It should be noted that file system meta-data integrity is preserved by both journaling modes.

In-built Cluster-stack with DLM
Includes an easy to configure, in-kernel cluster-stack with a distributed lock manager.

Buffered, Direct, Asynchronous, Splice and Memory Mapped I/Os
Supports all modes of I/Os for maximum flexibility and performance.

Large Inodes
Block-sized inodes allow it to store small files in the inode itself.

Comprehensive Tools Support
Provides a familiar EXT3-style tool-set that uses similar parameters for ease-of-use. The toolset is cluster-aware in that it prevents users from formatting a volume from a node if the volume is in use on some other node. Other tools such as tunefs.ocfs2 detect active volumes and allow only operations that can be performed on a live volume.

Performance Enhancements
Enhances performance by either reducing the numbers of I/Os or by doing them asynchronously.
            Indexed Directories – This feature allows a user to perform quick lookups of a directory entry in a very large directory. It also results in faster creates and unlinks and thus provides better overall performance.
            Directory Readahead - Directory operations asynchronously read the blocks that may get accessed in the future.
            File Lookup - Improves cold-cache stat(2) times by cutting the required amount of disk I/O in half.
            File Remove and Rename - Replaces broadcast file system messages with DLM locks for unlink(2) and rename(2) operations. This improves node scalability, as the number of messages does not grow with the number of nodes in the cluster.

Splice I/O
Adds support for the new splice(2) system call. This allows for efficient copying between file descriptors by moving the data in kernel.

Access Time Updates
Access times are now updated consistently and are propagated throughout the cluster. Since such updates can have a negative performance impact, the file system allows users to tune it via the following mount options:
            atime_quantum= - Defaults to 60 seconds. OCFS2 will not update atime unless this number of seconds has passed since the last update. Set to zero to always update it.
            noatime - This standard mount option turns off atime updates completely.
            relatime - This is another standard mount option (added in Linux v2.6.20) supported by OCFS2. Relative atime only updates the atime if the previous atime is older than the mtime or ctime. This is useful for applications that only need to know that a file has been read since it was last modified. Additionally, all time updates in the file system have nanosecond resolution.

Flexible Allocation
The file system now supports some advanced features that are intended to allow users more control over file data allocation. These features entail an on-disk change.
            Sparse File Support - It adds the ability to support holes in files. This allows the ftruncate(2) system call to efficiently extend files. The file system can postpone allocating space until the user actually writes to those clusters.
            Unwritten Extents - It adds the ability for an application to request a range of clusters to be pre-allocated, but not initialized, within a file. Pre-allocation allows the file system to optimize the data layout with fewer, larger extents. It also provides a performance boost, delaying initialization until the user writes to the clusters. Users can access these features via an ioctl(2), or via fallocate(2) on current kernels.
            Punching Holes - It adds the ability for an application to remove arbitrary allocated regions within a file. Creating holes, essentially. This could be more efficient if a user can avoid zeroing the data. Users can access these features via an ioctl(2), or via fallocate(2) on later kernels.
            Discontiguous Block Group – It allows the allocation of space for inodes to grow in smaller, variable-sized chunks.

Shared Writeable mmap(2)
Shared writeable memory mappings are fully supported now on OCFS2. The file system supports cluster coherent shared writeable mmap. Processes on different nodes can mmap() a file and write to the memory region fully expecting the writes to transparently show up on other nodes.

Inline Data
This feature makes use of OCFS2’s large inodes by storing the data of small files and directories in the inode block itself. This saves space and can have a positive impact on cold-cache directory and file operations. Data is transparently moved out to an extent when it no longer fits inside the inode block. This feature entails an on-disk change.

Online File system Resize
Users can now grow the file system without having to un-mount it. This feature requires a compatible clustered logical volume manager. Compatible volumes managers will be announced when support is available.

Clustered flock(2)
The flock(2) system call is now cluster-aware. File locks taken on one node from user-space will interact with those taken on other nodes. All flock(2) options are supported, including the kernel's ability to cancel a lock request when an appropriate kill signal is received.

Endian and Architecture Neutral
Supports a cluster of nodes with mixed architectures. Allows concurrent mounts on 32-bit and 64-bit, little-endian (x86, x86_64, ia64) and big-endian (ppc64) architectures.

Linux Community Adoption
OCFS2 has been ported to many architectures, including ppc64, ia64, s390x, and it's also integrated with many Linux distributions, including SLES, Ubuntu, openSUSE, Fedora Core, and Debian.

* Theoretical Maximum. File systems up to 16TB have been tested.