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Which two precautions should a vSphere administrator take before increasing the size of a VMFS datastore? (Choose two.)
A. Unmount the datastore
B. Perform a rescan to ensure that all hosts see the most current storage
C. Quiesce I/O on all disks involved
D. Shut down all virtual machines stored in the datastore
Correct Answer: BC
Explanation/Reference:
Explanation:
If your VMFS datastore requires more space, increase the datastore capacity. You can dynamically increase the capacity by growing a datastore extent or by adding a new extent.
Use one of the following methods to increase a datastore capacity:
Dynamically grow any expandable datastore extent, so that it fills the available adjacent capacity. The extent is considered expandable when the underlying storage device has free space immediately after the extent.
Dynamically add a new extent. The datastore can span over up to 32 extents with the size of each extent of more than 2TB, yet appear as a single volume. The spanned VMFS datastore can use any or all of its extents at any time. It does not need to fill up a particular extent before using the next one.
Generally, before making any changes to your storage allocation:
Perform a rescan to ensure that your host sees the most current storage.
Quiesce I/O on all disks involved.
Note the unique identifier (for example, the NAA ID) of the volume that you want to expand.
Incorrect Answers:
A: It is not necessary to unmount a datastore before increasing its capacity. You can dynamically expand a datastore. This means that the datastore can remain mounted and the virtual machines can be running when the datastore is expanded. Therefore, this answer is incorrect.
D: It is not necessary to shut down the VMs on the datastore before increasing its capacity. You can dynamically expand a datastore. This means that the datastore can remain mounted and the virtual machines can be running when the datastore is expanded. Therefore, this answer is incorrect.
References:
https://pubs.vmware.com/vsphere-55/index.jsp#com.vmware.vsphere.storage.doc/GUID-08E082E7-59CB-4BB0-B579-3903F14E95FC.html
http://www.infotechguyz.com/VMware/VMFSDatastores.html