Archive for VCAP5-DCA

Objective 1.2 – Manage Storage Capacity in a vSphere Environment

Objective 1.2 – Manage Storage Capacity in a vSphere Environment

Knowledge 

Identify storage provisioning methods

vSphere support several Storage provisioning methods

VMDK based

  • Thin
  • Thick – Lazy Zero
  • Thick – Eager Zero

RDM

  • Physical mode
  • Virtual Mode

I have already posted about VMDK disk provision types in here.

I have already posted about RDM in here

Identify available storage monitoring tools, metrics and alarms

vSphere comes with several monitoring tools for Storage including Performance tab in vSphere Client.

Here are the some of the metrics and corresponding (R)ESXTOP metric that you should be aware of

  • Device Command Latency (DAVG/cmd)
  • Kernel Command Latency (KAVG/cmd)
  • Virtual Machine Latency (GAVG/cmd = DAVG/cmd + KAVG/cmd)
  • Device Queue
  • LUN Queue
  • Number of Aborted disk Command(ABRTS/s)
  • Number of disk Command issue (ACTV)
  • Number of Command in Queue (QUED)
  • Read/Write Rate (READs/s, WRITEs/s, MBREAD/s, MBWRTN/s)

Skills and Ability

Apply space utilization data to manage storage resources 

Provision and manage storage resources according to Virtual Machine requirements

Understand interactions between virtual storage provisioning and physical storage provisioning 

Apply VMware storage best practices 

Configure Datastore Alarms

Analyze Datastore Alarms and errors to determine space availability 

Configure Datastore Clusters 

 

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VCAP5-DCA Objective 1.1 – Implement and Manage Complex Storage Solutions – Skills and Abilities

  • Determine use cases for and configure VMware DirectPath I/O
  • Determine requirements for and configure NPIV
  • Determine appropriate RAID level for various Virtual Machine workloads
  • Apply VMware storage best practices
  • Understand use cases for Raw Device Mapping
  • Configure vCenter Server storage filters
  • Understand and apply VMFS re-signaturing
  • Understand and apply LUN masking using PSA-related commands
  • Analyze I/O workloads to determine storage performance requirements
  • Identify and tag SSD devices
  • Administer hardware acceleration for VAAI
  • Configure and administer profile-based storage
  • Prepare storage for maintenance
  • Upgrade VMware storage infrastructure
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VCAP5-DCA Objective 1.1 – Implement and Manage Complex Storage Solutions – Knowledge

Objective 1.1 – Implement and Manage Complex Storage Solutions – Knowledge

Identify RAID Levels

Not sure how VMware will test me about RAID Levels in VCAP5-DCA Exam, but it is important to understand different types of RAID levels and their performance implication and disk failure supported. I’m sure if you are attempting for DCD exam, this will be one of the key factors of selecting right LUNs for the requirement.

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