Guest I/O Profiling – Survey Results

A month ago I posted a survey revolving around guest I/O workload characterization. The survey consisted of five questions (I wish I would have included a sixth) that asked respondents about their experience with profiling the I/O that goes to and from the guest VM to the storage subsystem. Let me tell you why this data is important: simply, knowing …

Guest I/O Workload Characterization – A Survey

As I get deeper into the design aspect of all things vSphere I have started to realize that workload characterization is a key competency when it comes to right-sizing every aspect of your design. When characterizing the I/O workload of existing virtual workloads, there aren’t too many tools available (that I’m aware of) to accomplish this task. The two tools …

vSphere 5.1 SSO and Cross-domain Authentication

Last week I was installing vSphere 5.1, which includes the SSO component in an environment with a Forest domain and many child domains. I noticed some very strange behavior when setting up permissions within vCenter when using universal security groups that existed at the forest root domain, but had members from child domains. I submitted an SR to VMware and …

Possibilities of VMware HA – VM Component Protection

While at VMworld 2012 I attended a session called “vSphere HA and Datastore Access Outages – Current – Capabilities Deep-Dive and Tech Preview” also known as INF-BCO2807. The presentation was put together by Smriti Desai (@smriti_desai) and Keith Farkas, both from VMware. If you haven’t seen this session and have access to them online, you really should take a look, …

VCAP5-DCA – Objective 6.5 – Troubleshoot vCenter Server and ESXi Host Management

For this objective I used the following documents: Documents listed in the Tools section Objective 6.5 – Troubleshoot vCenter Server and ESXi Host Management Knowledge **ITEMS IN BOLD ARE TOPICS PULLED FROM THE BLUEPRINT** Identify CLI commands and tools used to troubleshoot management issues If you can get to the console of your ESXi hosts, you can try restarting the …

VCAP5-DCA – Objective 6.4 – Troubleshoot Storage Performance and Connectivity

For this objective I used the following documents: Documents listed in the Tools section Objective 6.4 – Troubleshoot Storage Performance and Connectivity Knowledge **ITEMS IN BOLD ARE TOPICS PULLED FROM THE BLUEPRINT** Identify logs used to troubleshoot storage issues Log files that can be used to troubleshoot storage issues on an ESXi host all reside in the /var/log folder on …

VCAP5-DCA – Objective 6.3 – Troubleshoot Network Performance and Connectivity

For this objective I used the following documents: Documents listed in the Tools section Objective 6.3 – Troubleshoot Network Performance and Connectivity Knowledge **ITEMS IN BOLD ARE TOPICS PULLED FROM THE BLUEPRINT** Identify vCLI commands and tools used to troubleshoot vSphere networking configurations There are a good amount of vCLI commands that you can use to troubleshoot your networking configurations. …

VCAP5-DCA – Objective 6.2 – Troubleshoot CPU and Memory Performance

For this objective I used the following documents: http://communities.vmware.com/docs/DOC-11812 – Everything ESXTOP http://www.yellow-bricks.com/esxtop/ – Good rollup from Duncan Documents listed in the Tools section Objective 6.2 – Troubleshoot CPU and Memory Performance Knowledge **ITEMS IN BOLD ARE TOPICS PULLED FROM THE BLUEPRINT** Identify resxtop / esxtop metrics related to memory and CPU Here are a list of some of the …