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NS0-157 · Question #267

When a pNFS 4.1 client is connected to a LIF on node 2 of an 8 node clustered Data ONTAP pNFS 4.1 Vserver, and the data volume being read is moved to node 1, which statement is true?

The correct answer is A. The client redirects from a LIF on node 2 to a LIF on node 1 if available and continues data. pNFS 4.1 clients use layout-based direct data access, allowing them to receive updated layout referrals and redirect to the appropriate node LIF when a data volume is migrated.

Network Configuration and Data Access

Question

When a pNFS 4.1 client is connected to a LIF on node 2 of an 8 node clustered Data ONTAP pNFS 4.1 Vserver, and the data volume being read is moved to node 1, which statement is true?

Options

  • AThe client redirects from a LIF on node 2 to a LIF on node 1 if available and continues data
  • BThe client stays connected to a LIF on node 2 and accesses the data on node 1 through the
  • CDNS records are updated and the client moves access to a LIF on node 1 from DNS referral.
  • DWhen a data volume is moved, only CIFS clients are affected.

How the community answered

(43 responses)
  • A
    79% (34)
  • B
    12% (5)
  • C
    7% (3)
  • D
    2% (1)

Why each option

pNFS 4.1 clients use layout-based direct data access, allowing them to receive updated layout referrals and redirect to the appropriate node LIF when a data volume is migrated.

AThe client redirects from a LIF on node 2 to a LIF on node 1 if available and continues dataCorrect

With pNFS 4.1, the metadata server issues layout information that maps data to specific storage nodes. When a volume moves to node 1, the client receives a layout recall and is issued a new layout pointing to a LIF on node 1, allowing it to redirect and continue I/O directly to the correct node without interruption.

BThe client stays connected to a LIF on node 2 and accesses the data on node 1 through the

Staying on a node 2 LIF after the volume moves to node 1 would force inter-node cluster traffic, which defeats the purpose of pNFS 4.1's direct data access model.

CDNS records are updated and the client moves access to a LIF on node 1 from DNS referral.

pNFS 4.1 uses layout recall and referral mechanisms managed by the metadata server, not DNS record updates, to redirect clients after volume movement.

DWhen a data volume is moved, only CIFS clients are affected.

pNFS 4.1 is an NFS protocol feature affecting NFS clients specifically; CIFS clients use a completely separate protocol stack and are not relevant to pNFS behavior.

Concept tested: pNFS 4.1 client redirect behavior on volume migration

Source: https://docs.netapp.com/us-en/ontap/nfs-admin/support-cluster-wide-nfs-clients-concept.html

Topics

#pNFS 4.1#volume move#LIF#client redirection

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