Xsan is Apple’s clustering file system based on (Quantum). It allows multiple macOS, Windows, and Linux clients to simultaneously read/write to a shared storage area network (SAN). This article covers how to access, mount, troubleshoot, and manage Xsan volumes from the command line and GUI.

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Even well-configured Xsan systems can experience issues. Common symptoms include dropped frames, mounting errors, or slow performance.

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Xsan is Apple’s cluster file system based on (originally from ADIC) and later StorNext technology (Quantum). It allows multiple macOS, Windows, and Linux clients to concurrently access a shared block storage device over a Fibre Channel (FC) or iSCSI SAN.

Metadata includes file names, permissions, creation dates, and the physical locations of files on the storage blocks.

Access can be restricted by only allowing authorized computers to mount specific volumes using the Xsan Admin tool or the xsanctl command-line utility.

The "brain" of the SAN that manages file system metadata (file locations, names, and permissions). At least one primary MDC is required, but a second standby MDC is recommended for automatic failover. Xsan Clients:

These are primary workstations or servers that have direct physical connectivity to the storage network fabric.