About Xsan 1.4.2

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There are two updates for Xsan 1.4.2: "Xsan 1.4.2 Update" and "Xsan Admin 1.4.2 Update". These are available from both Apple Support Downloads and Software Update.

Important: Read before continuing

Before installation

  • Xsan 1.1 or later is required in order to install Xsan 1.4.2.
  • If you are setting up a new Xsan deployment, please see this article for the proper installation order.
  • Be sure that all Metadata Controllers (MDCs) are updated before you make any configuration changes.
  • Before installing, please review the Xsan Migration Guide.
  • During installation, do not change any Xsan settings using Xsan Admin or a command-line tool.
  • If upgrading system software to Mac OS X 10.5 Leopard, upgrade all Xsan 1.4.x systems to 1.4.2 before upgrading to Leopard.

After Installation

To prevent an inconsistent volume state, you should unmount, stop, and run the cvfsck command on each Xsan volume after the MDCs have been updated with Xsan 1.4.2 Update.

Metadata Controller (MDC) software version

Your MDCs must always have software versions (both Xsan and Mac OS) that are the same or more recent than the most recent client versions. Specifically, if any client in your Xsan network is using Xsan 1.4.2 with Mac OS X 10.4.10 or later, then your metadata controllers (MDCs) must also be updated to Xsan 1.4.2 on the same version of Mac OS X.

Software Update installation

Software Update may have referred you to this document. Because some updates are prerequisites for others, you may need to use Software Update more than once to get all available updates.

Standalone installer

A standalone installer is available from Apple Support Downloads.

Remote installation

If you need to install the update on a remote computer, use the softwareupdate command-line tool.

Hardware requirements

  • Xserve or Xserve G5
  • Mac Pro
  • Power Mac G5 (any)
  • Storage Network Requirements
  • Apple Fibre Channel PCI, PCI-X, or PCI-E Card

Compatibility matrix

See Xsan: Compatibility of SAN clients with Xsan and StorNext controllers.

What's new in Xsan 1.4.2

The Xsan 1.4.2 update addresses numerous issues related to overall reliability, usability and compatibility. It includes specific fixes for:

  • Mounting Fibre Channel LUNs on Mac OS X Leopard
  • Metadata controller failovers during power outages and network disconnects
  • Memory-related issues that could result in slow system performance or non-responsiveness
  • Reducing fragmentation of large files and frame drops during ingest
  • Preventing file system metadata corruption
  • Hosting Xsan volumes on Intel-based metadata controllers
  • Defragmenting files after a volume bandwidth expansion
  • Compatibility with Apple and third-party applications


The Xsan 1.4.2 Uninstaller removes Xsan, the Xsan Admin application, and Xsan documentation files. The Xsan 1.4.2 Uninstaller is appropriate version to use when uninstalling Xsan 1.4.x installations and can be obtained from Apple Support Downloads.

Note: Before removing Xsan, you should back up all of your data and volumes.

Xsan 1.4 documentation

Xsan 1.4.x administrators can find Xsan 1.4 documentation here.

Publicatiedatum: Oct 10, 2016