Friday, June 4, 2010

VMware disk alignment

If you have never heard about it don’t be shy, raise your hand…. I did not know about it like one year ago either.

If you have a guest suffering from performance or even your entirely environment and you don’t know where to look at anymore ….

Your problem might be misalignment volumes/disk.

An unaligned partition results in a track crossing and an additional I/O, incurring a penalty on latency and throughput. The additional I/O (especially if small) can impact system resources significantly on some host types. An aligned partitions ensures that the single I/O is serviced by a single device, eliminating the additional I/O and resulting in overall performance improvement.

Some Tips are:
- Always use Virtual Center to create configure your storage (don’t know why someone would do different, but disk alignment is possible on datastore and VMDK)
- Newer OS as Windows 2008 don’t have this issue
- Check your storage vendor for the correct disk alignment

VMWARE has created a good topic about it…here!!

If you are like me and want a visual clarification click here and check this good blog about it.

example of a disk aligned:

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I’m an IT specialist with over 15 years of experience, working from IT infrastructure to management products, troubleshooting and project management skills from medium to large environments. Nowadays I'm working for VMware as a Consulting Architect, helping customers to embrace the Cloud Era and make them successfully on their journey. Despite the fact I'm a VMware employee these postings reflect my own opinion and do not represents VMware's position, strategies or opinions. Reach me at @dumeirell

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