Command Purpose: The purehost monitor command is the primary tool in the Pure Storage CLI for observing real-time performance and connectivity health from the perspective of the hosts connected to the FlashArray.
The --balance Flag: When the --balance flag is added, the output shifts from general performance (IOPS, bandwidth, latency) to showing how I/O is distributed across the available paths (controllers and ports). This is critical for identifying "unbalanced" loads, which usually point to misconfigured MPIO (Multi-Path I/O) on the host side (e.g., a host only using one controller's ports).
Interval vs. Repeat:
The --interval flag specifies the time in seconds between each sample. In option C, --interval 15 tells the array to refresh the data every 15 seconds.
The --repeat flag (seen in option A) is used to limit the total number of samples taken before the command exits. However, in standard troubleshooting, the administrator typically wants a consistent stream of data until manually stopped (Ctrl+C).
--resample (seen in option B) is not a valid flag for the purehost monitor command in Purity.
Best Practice: When troubleshooting multipathing, Pure Storage recommends monitoring the balance to ensure that the "Relative I/O" percentage is roughly equal across all active paths. Large discrepancies often indicate that the host's MPIO policy is set to "Failover Only" instead of the recommended "Round Robin" or "Least Queue Depth."