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.
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)- A14% (5)
- B58% (21)
- C22% (8)
- D6% (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.
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.
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.
Eight paths would require more components in the connectivity chain, such as more WWPNs, fabrics, or targets, than specified in the scenario.
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
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