4.1.0 HP Polyserve Matrix Server Release Notes (T5392-96068, October 2010)

• Paging I/O. This is reads and writes initiated by the memory manager, in which it asks the

filesystem to fetch or store pages of file contents. Some examples are reads from files being executed

and reads and writes to files cached by the Windows cache manager.

• 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. Note that System ACLs and filesystem auditing are not supported.

• 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:

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

• Hard links.

• System ACLs and filesystem auditing.

• NTFS change journal. As a consequence, file replication services (FRS) cannot be used. Content

indexing is also affected. The content indexing service uses the NTFS change journal to determine

when to update the indices. In the PSFS filesystem, updates to the indices are done less frequently.

• Object IDs.

• Online defragmentation.

• Memory-mapped sparse files.

• Other filesystems (PSFS or non-PSFS) cannot be mounted on mount points within PSFS filesystems.

• Pagefiles such as pagefile.sys cannot be placed on a PSFS filesystem.

• Removable media.

• Use as the boot filesystem.

• Filesystem self-healing.

• Extended Attributes for the filesystem.

• Transactional filesystem.

• Encryption.

• Compression.

• USN change journal.

• BitLocker: no encryption on PSFS filesystems.

• Cross-file replication (DFS-R).

If you restore data from an NTFS filesystem to a PSFS filesystem, you may see warnings such as the

following. The warnings indicate that data belonging to an unsupported NTFS feature will be lost

during the restore.

Warning: The target file system does not support some of the

features of the original filesystem. Some data may not be

restored as a result.