nerdexam
CompTIA

SG0-001 · Question #140

An administrator has assigned a LUN to a host with two WWPNs. The WWPNs are attached to separate fabrics on the SAN. In a zone on each fabric the WWPN is assigned to two targets, associated to the LUN

The correct answer is B. 4. The host has 4 paths to its LUN because each of its two WWPNs connects to a distinct fabric, and within each fabric, that WWPN is zoned to two storage targets.

Storage Connectivity

Question

An administrator has assigned a LUN to a host with two WWPNs. The WWPNs are attached to separate fabrics on the SAN. In a zone on each fabric the WWPN is assigned to two targets, associated to the LUN. How many paths does the host have to its LUN?

Options

  • A2
  • B4
  • C8
  • D32

How the community answered

(36 responses)
  • A
    14% (5)
  • B
    58% (21)
  • C
    22% (8)
  • D
    6% (2)

Why each option

The host has 4 paths to its LUN because each of its two WWPNs connects to a distinct fabric, and within each fabric, that WWPN is zoned to two storage targets.

A2

Two paths would imply a simpler configuration, such as a single WWPN connected to two targets, or two WWPNs connected to a single target each, which does not match the description.

B4Correct

The host has two WWPNs, and each WWPN connects to a separate SAN fabric. Within each fabric, the WWPN is configured in a zone to communicate with two distinct targets. Therefore, each WWPN establishes 2 paths (1 WWPN to Target 1, 1 WWPN to Target 2), resulting in a total of 2 WWPNs * 2 targets/WWPN = 4 paths to the LUN.

C8

Eight paths would require more components in the connectivity chain, such as more WWPNs, fabrics, or targets, than specified in the scenario.

D32

Thirty-two paths is an excessively high number for the given configuration and would require significantly more WWPNs, fabrics, or targets than described.

Concept tested: SAN multipathing calculation

Source: https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.storage.doc/GUID-4FC96901-C343-4C3D-882E-B9DCC4A180E8.html

Topics

#SAN connectivity#LUN zoning#WWPN#multipathing

Community Discussion

No community discussion yet for this question.

Full SG0-001 Practice