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
Explanation:
http://kb.vmware.com/selfservice/microsites/search.do?cmd=displayKC&docType=kc&externalId=1017662&sliceId=1&docTypeID=DT_KB_1_1&dialogID=311968691&stateId=1%200%20311974702
Go to see the steps of “Growing or expanding a VMFS volume or datastore (1017662)”,it will be helped.
http://www.infotechguyz.com/VMware/VMFSDatastores.html
Before increasing the Size of a VMFS Datastore
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.
From above referenced Growing or expanding a VMFS volume or datastore (1017662)
* Go to Configuration > Storage adapters and perform a rescan
– Note: If the LUN experiences a high I/O throughput when growing the VMFS, the ESX host may not be able to complete the operation
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Cold Expansion:
Shut down all virtual machines stored in the datastore
Unmount the datastore
This link below categorically advises that the VMs be turned off as a precaution.
https://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1752