A virtual machine is using a Fibre Channel attached RDM LUN.
Which three use cases would necissatate a RDM? (Choose three.)
A.
VMware snapshots
B.
NPIV
C.
Physical server-to-virtual machine clustering
D.
Distributed file locking
E.
SAN management agents
NPIV stands for N-Port ID Virtualization. It is an ANSI T11 standard that describes how a single Fibre Channel Physical HBA port can register with a fabric using several worldwide port names (WWPNs), what might be considered Virtual WWNs. This in turn means that since there a multiple Virtual HBAs per physical HBA, we can allow WWNs to be assigned to each VM.
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Why not Distributed file locking ?
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cuz file locking and snapshots are virtual RDM benefits
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I am inclined to say that NPIV and how the Host logs into the SAN fabric should have nothing to do with a VM and its need for RDM. I would say Distributed File locking is a candidate:
https://pubs.vmware.com/vsphere-50/index.jsp?topic=%2Fcom.vmware.vsphere.storage.doc_50%2FGUID-9E206B41-4B2D-48F0-85A3-B8715D78E846.html
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Correct: C, E, and B not D
Because:
“You can use NPIV only for virtual machines with RDM disks.”
http://pubs.vmware.com/vsphere-55/index.jsp#com.vmware.vsphere.storage.doc/GUID-D9B143D8-9F93-41D1-A32F-9FF4DE4CDF14.html
“VMFS and RDM. Both options provide clustered file system features such as user‐friendly persistent names, distributed file locking, and file permissions.”
http://www.vspecialist.co.uk/objective-1-1-raw-device-mapping-rdm/
I study a lot and work with this technology but still this questions are messy for me:
1467 – A or B or D
1506 – D and C or A
1549 – A or C or D
818 – A and D
1162 – B or C
1336 – D and B or A
1488 – A
1474 – A or C
1461 – ?
179 – BD?
705 – DB?
563 – AD?
1237 – BD?
371 – A or D
Guys please comment this questions.
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