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
A
How can we exclude B from being the answer?
https://pubs.vmware.com/vsphere-51/index.jsp?topic=%2Fcom.vmware.vsphere.resmgmt.doc%2FGUID-225AFC38-C82A-47D9-92F0-9A1AE9E3C8B7.html
Yes I/O imbalance is not mentioned but if the VMs are being migrated and the datastores are evenly utilised, couldn’t I/O imbalance be a possiblity?
if we suppose that B is the correct answer that means the I/O imbalance threshold is already high between Data stores, increasing it will not stop the migration in this case , so the only explication is that the percentage of the Space Utilization Difference
threshold is low and we need to increase it to avoid data migration until the new percentage