SAN-QFS Shared File System and Sun QFS Shared File System Comparison

The SAN-QFS shared file system and the Sun QFS shared file system have the following similarities:

Both can stage files.
Both are useful in data capture environments in which the primary file system host should not be responsible for writing the data.
Both are advantageous in environments where there is contention for writing files.

The following table describes differences between the file systems.

Table 11-1 SAN-QFS Shared File System Versus Sun QFS Shared File System

SAN-QFS File System	Sun QFS Shared File System
Uses NFS protocol for metadata	Uses natural metadata
Preferred in heterogeneous computing environments (that is, when not all hosts are Sun systems)	Preferred in homogeneous Oracle Solaris OS environments
Useful in environments where multiple, heterogeneous hosts must be able to write data	Preferred when multiple hosts must write to the same file at the same time

The SANergy software does not enforce block quotas. Therefore, you can exceed a block quota when writing a file with the SANergy software. For more information on quotas, see Enabling Quotas.

The SANergy software uses the NFS software for metadata operations, which means that the NFS close-to-open consistency model is used for file data and attributes. File data and attributes among SANergy clients do not support the POSIX coherency model for open files.

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	Sun QFS File System 5.3 Configuration and Administration Guide Sun QFS and Sun Storage Archive Manager 5.3 Information Library