3.4.0 Matrix Server Release Notes

PolyServe Matrix Server Release Notes 5

• Hidden, readonly, archive bits (and so on).

• Memory-mapped files. PSFS support is for the local node only;

memory mapped file data is not coherent cluster-wide. (See

“Filesystem Semantics” for more information.)

• Open by File ID.

• Opportunistic locking. PSFS supports coherency of client-cached data

over a single CIFS server and over multiple CIFS servers sharing the

same filesystem.

•Paging I/O.

•Removable devices.

• Reparse points. PSFS filesystems can be mounted on mount points

residing on NTFS filesystems.

• Security descriptors. Security updates are immediately and

simultaneously applicable to all servers in the cluster. System ACLs

are supported to control auditing.

• Sparse file API.

•Unicode file names.

Filesystem Implementation Differences

Although the PSFS filesystem is a standard Windows filesystem and

supports standard filesystem operations, it differs from the NTFS

filesystem in certain areas. Also, certain Windows utilities and

applications cannot manipulate a PSFS filesystem in the same manner as

an NTFS filesystem.

Unsupported Features

The following NTFS features are not supported on PSFS filesystems:

• Alternate data streams. This behavior is consistent with the FAT

filesystem. Applications will typically discard any alternate data

streams such as summary properties.

• File encryption and compression. This behavior is consistent with the

FAT filesystem.