VMX Swap feature in vSphere 5.0

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Something you might have missed…. A little known feature of vSphere 5.0 called VMX swap helps to reduce the memory footprint of the VMX process by up to 80%. The vSphere kernel has several internal processes, agents, and data structures that require physical memory. vSphere reserves physical memory on the host to assure that these Read more...

Viewing ESXi Logs From the DCUI

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Posted 28 June 2012 by Kyle Gleed, Sr. Technical Marketing Architect, VMware I recently had a customer ask if I had any tips for viewing log files from the DCUI.  He mentioned that he was recently trying to track down an issue but struggled with using the DCUI "View System Logs" feature.  He commented that Read more...

Storage IO Control and SRM Planned Migration

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We have a known behaviour documented in this KB article in this KB article and also in this KB article dealing with unmounting a datastore that is using Storage IO Control. At its core, SIOC is doing rapid checks against the datastore to test current storage conditions, including populating an always open file (iormstats.sf) with latency data used to help Read more...

vSphere HA admission control calculation for memory

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By Duncan Epping, Principal Architect. Someone asked me today how the calculation is done for memory when the "Percentage Based" admission control policy was selected. As hopefully all of you know by now, the percentage based admission control policy does not work with fixed slot sizes. (More details to be found in the Availability Guide Read more...

SRM will not preserve reservations on failover

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Saw a good question a few times in the last few weeks:  Will SRM preserve any reservations, limits, etc. that we've put on VMs when it fails over? The answer is no, it will not!  Make sure you're failing over into appropriate resource pools if this is something that is important to you.   The Read more...

How to use Port-Mirroring feature of VDS for monitoring virtual machine traffic?

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I would like to clarify few things in this blog entry about the Port-mirroring feature that is available on vSphere Distributed Switch (VDS). This feature is similar to the port mirroring capability available on the physical switches. Network administrators can use this feature to troubleshoot any network related issues in the virtual infrastructure and monitor Read more...
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Leveraging vApp & VM Custom Properties In vCloud Director

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By William Lam, Sr. Technical Marketing Engineer A neat little feature that I have been exploring with in vCloud Director is Custom Properties for a vApp and Virtual Machine. This was one of the new features in the vCloud Director 1.5 release which allows users to easily pass data into the guest OSes using OVF Read more...

VMware Workstation Tech Preview 2 available

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By Duncan Epping, Principal Architect. I just noted on twitter that VMware Workstation Tech Preview 2 was released. I know this blog is not about Workstation but about vSphere, despite that I feel it is important enough to mention. One of the reasons for it is the fact that with VMware Workstation TP2 you can: Upload Read more...