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VCP 5 Section 4.1 - Virtual Disks
Configure/Modify disk controller for virtual disks/ Configure appropriate virtual disk type for a virtual machine/ Create/Convert thin/thick provisioned virtual disks/ Configure disk shares
11
Software
Professional
01/19/2013

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Term
Where do you modify the disk controller for virtual disks?
Definition
1. Ensure VM is powered off
2. Go into VM settings and select the disk controller and click the 'Change type' buttton.
Term
How do you add a new SCSI controller to a VM?
Definition
Create another virtual disk. When adding the disk you specify the SCSI address as one different than the current (1:0, 2:0, 3:0). When adding the disk, vSphere will add a new SCSI controller as well.
Term
What are the 4 disk type options for virtual disks?
Definition
1. Thick Provisioned Lazy Zeroed (zeroedthick)
2. Thick Provision Eager Zeroed (eagerzeroedthick)
3. Thin Provision
4. Raw Device Mapping (RDM)
Term
How is a Thick Provisioned Lazy Zeroed Disk (zeroedthick) disk provisioned?
Definition
Space required for the virtual disk is allocated during the creation of the disk file. Any data remaining on the physical device is not erased during creation, but is zeroed out on demand at a later time on first write from the virtual machine. The virtual machine does not read stale data from disk.
Term
How is a Thick Provisioned Eager Zeroed Disk (eagerzeroedthick) disk provisioned?
Definition
Space required for the virtual disk is allocated at creation time. In contrast to zeroedthick format, the data remaining on the physical device is zeroed out during creation. It might take much longer to create this type of disk, but on an ongoing basis, write will be faster.
Term
How is a Thin Provisioned disk provisioned?
Definition
Space required for the virtual disk is not allocated during creation but is supplied and zeroed out on demand at a later time.
Term
How is a Raw Device Mapping (RDM) provisioned?
Definition
Allows a VM to store its data directly on a SAN LUN. The RDM file (which ends in .vmdk) contains the LUN mapping information that ESXi uses to process I/o to the assigned LUN
Term
How do you convert disks from thin to thick?
Definition
1. You can inflate your thin provisioned VM by browsing your VM in the datastore browser. When you find the .vmdk file, right click and select 'inflate'
2. You can also storage vMotion the VM
Term
T/F: VMs can access the same datstore or same LUN
Definition
True. Disk shares can help you to prioritize each virtual disk access.
Term
Why must disk shared be configured on a host level - not a resource pool or cluster level?
Definition
Because disk I/O is a host centric resource.
Term
How do you configure disk shares?
Definition
Right click the VM and select 'Edit Settings'. Find the disk on the 'resource' tab. Set shares as Low (500), Normal (1000) or High (2000) or a custom value. You can also set a limit here for IOPs.
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