Which of the following are accurate descriptions of the Predictive and Adaptive Schemes for placing VMFS datastores (Choose Two)?
A.
The Predictive Scheme utilizes several LUNs with different storage characteristics
B.
The Predictive Scheme utilizes a small number of large LUNs
C.
The Adaptive Scheme utilizes a small number of large LUNs
D.
The Adaptive Scheme utilizes several LUNs with different storage characteristics
Explanation:
Making LUN Decisions.
In the predictive scheme, you:
Create several LUNs with different storage characteristics. (B above) Build a VMFS volume in each LUN (label each volume according to its characteristics). Locate each application in the appropriate RAID for its requirements. Use disk shares to distinguish high-priority from low-priority virtual machines. Note that disk shares are relevant only within a given ESX Server host. The shares assigned to virtual machines on one ESX Server host have no effect on virtual machines on other ESX Server hosts.
In the adaptive scheme, you:
Create a large LUN (RAID 1+0 or RAID 5), with write caching enabled. (A above) Build a VMFS in that LUN.
Place four or five virtual disks on the VMFS.
Run the applications and see whether disk performance is acceptable. If performance is acceptable, you can place additional virtual disks on the VMFS. If it is not, you create a new, larger LUN, possibly with a different RAID level, and repeat the process. You can use cold migration so you don’t lose virtual machines when recreating the LUN.