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Home About VCP Virtual Home Lab VCP6 Study Guide VCAP6-DCV Deploy Study guide VCAP6 – DCV Design Collection
in study guide - 12 Feb, 2016
by mordi - no comments
VCP6-DCV blueprint section 7 – Objective 7.2: Troubleshoot vSphere Storage and Network Issues

In this post i will continue to cover the troubleshooting objective and now its time for Storage and networking.

The following are the objective from the blueprint:

  • Verify network and storage configuration
  • Recognize a connectivity issue caused by a VLAN/PVLAN
  • Identify and isolate network and storage resource contention and latency issues
  • Verify a given virtual machine is configured with the correct network resources
  • Monitor/Troubleshoot Storage Distributed Resource Scheduler (SDRS) issues
  • Recognize the impact of network and storage I/O control configurations
  • Troubleshoot common issues with:
    • Storage and network
    • Virtual switch and port group configuration
    • Physical network adapter configuration
    • VMFS metadata consistency

 

Verify network and storage configuration:

We already discuss how to configure Network and Storage in vSphere environment . please look on networking and and storage objectives.

Recognize a connectivity issue caused by a VLAN/PVLAN :

There are two locations to check for VLAN/PVLAN when troubleshooting connectivity issues.

Configure type of VLAN:

vlanpvlan1

Configure the Uplink VLAN’s

vlanpvlan2

 

For more information about Private VLAN’s look at the KB 1010691

Identify and isolate network and storage resource contention and latency issues:

Storage: We can look at the array that we are connected too, in many advanced array system there is away to look at the disks/LUN’s/ aggregates performance , latency and queue depth .Also make sure you use the right disk configuration (7.2K/10K/15K,SSD) .

Storage latency also can be caused by VMkerenel activity , the VMKernel can be busy and  not provide the right access to storage.

Network: possible networking latency issues can be couse by the following :

  • External Switch
  • NIC configuration and bandwidth (1G/10G/40G)
  • CPU contention

Verify a given virtual machine is configured with the correct network resources:

for this we will need to look at KB article 1003893

Recognize the impact of network and storage I/O control configurations:

When we talked about Network I/O and Storage I/O in the previous blog posts  we mention that we can apply priority for traffic controlled by NOIC . For troubleshooting you can look at the traffic information and make sure you set the right priority’s. As for SIOC , you need to make sure that you set the right peak thresholds

Monitor/Troubleshoot Storage Distributed Resource Scheduler (SDRS) issues:

In VMware vSphere troubleshooting guide page 47 they are talking about the following issues and how to solve them:( I guess we need to know them for the exam :-))

  • Storage DRS is Disabled on a Virtual Disk
  • Datastore Cannot Enter Maintenance Mode
  • Storage DRS Cannot Operate on a Datastore
  • Moving Multiple Virtual Machines into a Datastore Cluster Fails
  • Storage DRS Generates Fault During Virtual Machine Creation
  • Storage DRS is Enabled on a Virtual Machine Deployed from an OVF Template
  • Storage DRS Rule Violation Fault Is Displayed Multiple Times
  • Storage DRS Rules Not Deleted from Datastore Cluster
  • Applying Storage DRS Recommendations Fails

Please review these issues from the document.

Troubleshoot common issues with:

  • Storage and network
  • Virtual switch and port group configuration
  • Physical network adapter configuration
  • VMFS metadata consistency

we already discuss the networking and storage issue , i will refer to the troubleshooting guide for more examples .

For VMFS consistent issues there is a great KB articale about this subject KB 2036767 , talking about VOMA.

voma

 

Thanks for reading

Mordi.

 

 

 

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