An administrator needs to unmount a datastore that is also used for HA storage heartbeats.
What is the least disruptive method for an administrator to perform this activity on a slave HA host?
A. On the Datastore Heartbeating tab, unmount the datastore normally and confirm a new datastore has been selected.
B. On the Datastore Heartbeating tab, specify an alternate datastore, then unmount the datastore normally.
C. Disable HA datastore heartbeats, then unmount the datastore.
D. Reduce the number of heartbeat datastores, then remove the datastore from the heartbeat list.
Correct Answer: B
Explanation/Reference:
Explanation:
When the master host in a vSphere HA cluster cannot communicate with a slave host over the management network, the master host uses datastore heartbeating to determine whether the slave host has failed, is in a network partition, or is network isolated. If the slave host has stopped datastore heartbeating, it is considered to have failed and its virtual machines are restarted elsewhere.
When you unmount a datastore, it remains intact, but can no longer be seen from the hosts that you specify. The datastore continues to appear on other hosts, where it remains mounted. vSphere HA heartbeating does not prevent you from unmounting the datastore. If a datastore is used for heartbeating, unmounting it might cause the host to fail and restart any active virtual machine. If the heartbeating check fails, the vSphere Client displays a warning.
To dismount a heartbeating datastore without causing any disruption, you should configure an alternative datastore for heartbeating first. The Datastore Heartbeating tab in the cluster properties dialog box lets you specify alternative datastores. You can then dismount the datastore as normal.
Incorrect Answers:
A: This is not the correct way to dismount a datastore. You should use the Datastore Heartbeating tab to select a different datastore and then dismount the datastore. Therefore, this answer is incorrect.
C: It is not necessary to disable HA datastore heartbeats. Disabling HA datastore heartbeats will disrupt the operation of HA. Therefore, this answer is incorrect.
D: This question does not state how many datastores are available for selection. A minimum of two datastores are required for HA heartbeating. This answer is an incomplete solution. We do need to remove the datastore from the heartbeat list. However, that alone will not dismount the datastore. Dismounting the datastore is a separate step. Therefore, this answer is incorrect.
References:
https://pubs.vmware.com/vsphere-55/index.jsp?topic=%2Fcom.vmware.vsphere.avail.doc%2FGUID-0502B198-F5F7-4101-969C-C5B6F364C678.html
https://pubs.vmware.com/vsphere-50/index.jsp?topic=%2Fcom.vmware.vsphere.storage.doc_50%2FGUID-1B56EF97-F60E-4F21-82A7-8F2A7294604D.html