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