The 1.4.1 Update delivers overall improved reliability for Xsan and is required for all systems running 10.4. It includes fixes for:

• using Xsan on computers running Mac OS X and Mac OS X Server version 10.4
• providing metadata controller services to 10.3.9 and 10.4 systems running Xsan 1.1
• accessing Xsan volumes larger than 16 terabyte in size
• greater server stability when resharing Xsan volumes via NFS
• handling quotas with no associated user or group name
• maintaining access to Xsan volumes when metadata controller failovers occur
• operating Xsan in environments with a mix of 10.3.9 and 10.4 systems

Important Notes:
If any system in your SAN is running Xsan 1.4 on Mac OS X v10.4, then your metadata controllers must also run the same. You cannot use a metadata controller running on Mac OS X v10.3 if any client is running Xsan 1.1 on Mac OS X v10.4.

For detailed information on this Update, please visit this website: http://www.info.apple.com/kbnum/n301212