vSphere Single Sign On? Rethink Your Architecture

vSphere Single Sign On (SSO) is a new feature in vSphere 5.1, introducing a standalone service that act as an authentication broker for various VMware products such as vCenter Server, vCloud Director, VCO, vShield Manager or VMware Horizon. SSO is a critical component that is required before any other vSphere 5.1 component is installed or …

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vSphere 5.1 What’s New

vSphere 5.1 What’s New

VMware’s latest release of its industry-leading virtualization platform. This new release contains the following new features and enhancements:


Larger virtual machines – Virtual machines can grow two times larger than in any previous release to support even the most advanced applications. Virtual machines can now have up to 64 virtual CPUs (vCPUs) and 1TB of virtual RAM (vRAM).

New virtual machine format – New features in the virtual machine format (version 9) in vSphere 5.1 include support for larger virtual machines, CPU performance counters and virtual shared graphics acceleration designed for enhanced performance.


Flexible, space-efficient storage for virtual desktop infrastructure (VDI) – A new disk format enables the correct balance between space efficiency and I/O throughput for the virtual desktop.


vSphere Distributed Switch – Enhancements such as Network Health Check, Configuration Backup and Restore, Roll Back and Recovery, and Link Aggregation Control Protocol support and deliver more enterprise-class networking functionality and a more robust foundation for cloud computing.

Single-root I/O virtualization (SR-IOV) support
Support for SR-IOV optimizes performance for sophisticated applications.

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VMware vCenter 5.0 Update 1a released

vCenter Server Appliance 5.0 Update 1a is the first major update since vCenter Server Appliance 5.0 was released

VMware vCenter Server 5.0 Update 1a is a patch release and offers the following improvements:

  • vCenter Server 5.0 Update 1a introduces support for the following vCenter Databases
    • Oracle 11g Enterprise Edition, Standard Edition, Standard ONE Edition Release 2 [] – 64 bit
    • Oracle 11g Enterprise Edition, Standard Edition, Standard ONE Edition Release 2 [] – 32 bit
  • vCenter Server Appliance Database Support: The DB2 express embedded database provided with the vCenter Server Appliance has been replaced with VMware vPostgres database. This decreases the appliance footprint and reduces the time to deploy vCenter Server further.
  • Resolved Issues: In addition, this release delivers a number of bug fixes:

This release resolves issues in the following subject areas.

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vMotion Causes Unicast Flooding

Today I visited a client who did not apply the best practice to separate vMotion traffic in it’s own isolated VLAN. Live migration from one host to another cause the physical switch to experience unicast flooding. After much investigation, the solution was quite simple: Don’t setup your management and your vMotion network traffic to be on the same subnet.

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vSphere 5.0 Hardening Guide – Official Release

This is the official release of the vSphere 5.0 Security Hardening Guide, v1.0. The format of this guide has changed from previous versions. The guide is being released as a Excel spreadsheet only. The guideline metadata from earlier guides has been greatly expanded and standardized. CLI commands for assessment and remediation of the guidelines is …

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Creating Disk IO Excel graphics with ESXTOP

This week I was visiting a client who bought an expansion on their MD3000i storage of 5 disks.
I wanted to know if all 6 servers would fit on a new raid 5 set (4+1) so I started to monitor the Disk Commands/Sec with ESXTOP for a number of hours to see what the servers generate on a normal working day with everybody at work.

I logged in both ESX hosts and started ESXTOP


Make sure you only capture relevant info.

You need to remove all all other fields in c:cpu i:interrupt m:memory n:network d:disk adapter u:disk device p:power

remove (f) the metrics you don’t need. After that write (w) the configuration to disk  to /tmp/io

this example uses v:disk metric

Enter command: “esxtop -b -c /tmp/io -d 2 -n 5400 > /tmp/diskio-pervm.csv”

  • -b is for batch mode
  • -c is the configfile for esxtop which you saved.
  • -d sets the delay between updates in seconds.
  • -n runs esxtop for only n iterations, in this case 30 times per minute x 60 times per hour x 3 hours = 5400
  • /tmp/diskio-pervm.csv is the location where the output of the logging will be written.

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I/O Analyzer a performance measure VMware fling

I/O Analyzer is a virtual appliance tool that provides a simple and standardized approach to storage performance analysis in VMware vSphere virtualized environments. I/O Analyzer provides a structured way to generate a variety of I/O workloads on the test system(s), including the ability to allow the user to replay an I/O trace that was captured elsewhere. It collects I/O performance data about the I/O workload run and provides visualization charts of the results. Please post comments and questions regarding this fling to the I/O Analyzer Community instead of on this blog.

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