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A database administrator has requested that a virtual disk attached to a virtual machine running an I/O intensive database application be fully provisioned. The virtual disk was initially thin provisioned. Which two methods would accomplish this task? (Choose two.)
A. Use Storage vMotion and change the disk type to Flat.
B. Use the Inflate option in the Datastore Properties.
C. Use Storage vMotion and change the disk type to Thick Provisioned Lazy Zeroed.
D. Use Storage vMotion and change the disk type to Thick Provisioned Eager Zeroed.
Correct Answer: BD
Explanation/Reference:
As of ESXi 5 you have two choices: Storage vMotion and inflate. When initiating a Storage vMotion you have the option to choose any of the three options below and convert it. Eager zeroed is considered to be the best for intensive I/O applications.
Disk Types
Thick Provision Lazy Zeroed – Space required for virtual disk is allocated at creation time but the disk is zeroed out on demand when requested by the guest operating system (like a fast format in Windows). Fast creation, fully allocated blocks on datastore, high chance of contiguous file blocks.
Thick Provision Eager Zeroed – Space required for virtual disk is allocated at creation time and every sector of the disk is zeroed during disk creation. Slow creation, fully allocated blocks on datastore, highest chance of contiguous file blocks.
Thin Provision – Disk only uses as much space as it initially needs. Fastest creation, Allocated and zeroed out on demand, low chance of contiguous file blocks, uses less disk space
You can also turn a thin into thick by finding the flat file using the datastore browser and selecting inflate.
http://blogs.vmware.com/apps/2011/11/using-virtual-disks-for-business-critical-apps-storage.html