What are two benefits of Virtual Compatibility Mode for RDMs, as compared to Physical Compatibility Mode (Choo

What are two benefits of Virtual Compatibility Mode for RDMs, as compared to Physical Compatibility Mode (Choose Two)?

A.
Allows for template creation of the related virtual machine

B.
Allows for cloning

C.
Allows for the use of array-based snapshots

D.
Allows the use of SAN-aware applications

Explanation:
Storage options for virtual machines: Raw device mappings, VMFS

RDM limitations
There are two types of RDMs: virtual compatibility mode RDMs and physical compatibility mode RDMs. Physical mode RDMs, in particular, have some fairly significant limitations:

No VMware snapshots
No VCB support, because VCB requires VMware snapshots No cloning VMs that use physical mode RDMs
No converting VMs that use physical mode RDMs into templates No migrating VMs with physical mode RDMs if the migration involves copying the disk No VMotion with physical mode RDMs

One Comment on “What are two benefits of Virtual Compatibility Mode for RDMs, as compared to Physical Compatibility Mode (Choo

  1. Ed says:

    The only place I found that shows C is not correct is http://pubs.vmware.com/vsphere-50/index.jsp?topic=/com.vmware.vsphere.storage.doc_50/GUID-3F97FB05-3C92-4040-84E7-D928555B3808.html#com.vmware.vsphere.storage.doc_50/GUID-C87AB9C7-FF0F-474E-82FA-4B289E3C8853.html?resultof=%2522%2556%2549%2552%2554%2555%2541%254c%2522%2520%2522%2576%2569%2572%2574%2575%2561%256c%2522%2520%2522%2572%2564%256d%2522%2520%2522%2541%2552%2552%2541%2559%2522%2520%2522%2561%2572%2572%2561%2569%2522%2520%2522%2542%2541%2553%2545%2522%2520%2522%2562%2561%2573%2565%2522%2520

    ” If you use an array-based solution, physical compatibility RDMs are often used for the storage of virtual machines. If you do not intend to use RDMs, check the storage vendor documentation to see if operations on LUNs with VMFS volumes are supported. If you use array operations on VMFS LUNs, carefully read the section on resignaturing.”


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