Home » VMware » VCP550D » Which Storage DRS setting should the administrator change to prevent the virtual machines from migrating prematurely?
An organization’s datastores are configured in a fully automated Storage Distributed Resource Scheduler (SDRS) cluster. The vSphere administrator determines that virtual machines are being migrated between datastores even though the datastores look evenly balanced. On further investigation, the administrator determines that the datastore’s utilization percentages differ by 2%.
Which Storage DRS setting should the administrator change to prevent the virtual machines from migrating prematurely?
A. Edit the Storage DRS cluster settings to increase the percentage of the Space Utilization Difference threshold
B. Edit the Storage DRS cluster settings to increase the percentage of the I/O imbalance threshold
C. Edit the Storage DRS cluster settings to increase the size of the Space Utilization Difference threshold
D. Edit the Storage DRS cluster settings to increase the size of the I/O imbalance threshold
Correct Answer: A
Explanation/Reference:
Explanation:
A: The Space Utilization Difference is a slider tool that allows you to set how much improvement SDRS should look for prior to making a recommendation or performing a migration. Thus if you increase this threshold be increasing the percentage you can prevent the premature virtual machine migration.
Incorrect Answers:
B: The I/O Imbalance Threshold controls the aggressiveness of the SDRS algorithm. The more aggressive, the more the counter increases and then the priority of recommendation for automated SDRS is running.
C: The size of the Space Utilization Difference threshold will not influence the automatic migration of virtual machines, because it has been determined that the datastore utilization percentages differ by 2%.
D: The Imbalance threshold is used to control the aggressiveness of the SDRS algorithm.
References:
Lowe, S. & Marshall, N., Mastering VMWare vSphere 5.5, Wiley and Sons, Indianapolis, 2014, p. 659-660