Term
| Where do you modify the disk controller for virtual disks? |
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Definition
1. Ensure VM is powered off
2. Go into VM settings and select the disk controller and click the 'Change type' buttton. |
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Term
| How do you add a new SCSI controller to a VM? |
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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. |
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Term
| What are the 4 disk type options for virtual disks? |
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Definition
1. Thick Provisioned Lazy Zeroed (zeroedthick)
2. Thick Provision Eager Zeroed (eagerzeroedthick)
3. Thin Provision
4. Raw Device Mapping (RDM) |
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Term
| How is a Thick Provisioned Lazy Zeroed Disk (zeroedthick) disk provisioned? |
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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. |
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Term
| How is a Thick Provisioned Eager Zeroed Disk (eagerzeroedthick) disk provisioned? |
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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. |
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Term
| How is a Thin Provisioned disk provisioned? |
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Definition
| Space required for the virtual disk is not allocated during creation but is supplied and zeroed out on demand at a later time. |
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Term
| How is a Raw Device Mapping (RDM) provisioned? |
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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 |
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Term
| How do you convert disks from thin to thick? |
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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 |
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Term
| T/F: VMs can access the same datstore or same LUN |
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Definition
| True. Disk shares can help you to prioritize each virtual disk access. |
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Term
| Why must disk shared be configured on a host level - not a resource pool or cluster level? |
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Definition
| Because disk I/O is a host centric resource. |
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Term
| How do you configure disk shares? |
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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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