This is the "gold standard" for Xsan. Clients are equipped with Fibre Channel Host Bus Adapters (HBAs) and connect directly to a switch that links to the RAID storage.

| Tool | Purpose | Availability | |------|---------|--------------| | xsanctl | Manage Xsan on macOS | Built‑in (macOS with Xsan client) | | cvfsck | Check/repair CVFS volume | Quantum StorNext package | | cvlabel | Display/manage volume labels | StorNext package | | asr | Block‑copy volumes | Built‑in macOS | | StorNext Client (Windows/Linux) | Cross‑platform access | Commercial (Quantum) | | Xray for Xsan | Forensic parsing | Third‑party (commercial) |

: File data is transferred between clients and the storage system over a high-speed Fibre Channel fabric .

# On Linux (with StorNext client) cvfsck -n -V /dev/sdX # Check volume without MDC cvlabel -l # List Xsan volumes on block devices

This is the scenario you are dreading. The metadata controller crashed, and the FSNameserver list is gone.