According to official VMware vSAN documentation, which is the underlying storage technology for Dell EMC VxRail, the vSAN capacity history feature retains and displays data for a maximum period of one year (365 days). This functionality is available in the vSphere Client under the cluster's Monitor > vSAN > Capacity section. It allows administrators to analyze historical capacity usage, track consumption trends over time, and perform capacity planning based on long-term data. The data is collected and aggregated by the vSAN performance service.

A. 30: This is incorrect. While some performance metrics might have shorter retention periods, the specific vSAN capacity history is stored for a much longer duration.

B. 60: This is an incorrect value. The maximum retention period for vSAN capacity history significantly exceeds 60 days.

D. 120: This is incorrect. The documented maximum retention period is 365 days, not 120 days.

1. VMware vSAN 8 Documentation

Administering VMware vSAN

Section: "Monitoring vSAN Capacity"

Subsection: "Capacity History". The documentation states

"You can view vSAN capacity usage for the last year."

Source: VMware vSphere Product Documentation. (Direct link cannot be provided

but the path is: VMware Docs > vSphere > Administering VMware vSAN > Monitoring vSAN Health and Performance > Monitoring vSAN Capacity).

2. VMware vSAN 7.0 Update 3 Documentation

Administering VMware vSAN

Chapter 6: "Monitoring vSAN Health and Performance"

Section: "Monitoring vSAN Capacity". This guide also confirms

"The capacity history displays data for up to one year."

Source: VMware vSphere Product Documentation for vSAN 7.0 U3.