HP StorageWorks Clustered File System 3.6.0 Windows Storage Server Edition (software-only) Release Notes (432086-004, February 2008)

• Case-sensitive naming.
• Content indexing. PSFS support is the same as the FAT filesystem. (See “Unsupported Features”
for more information.)
• Directory Change Notification (D C N). PSFS supports both local-node and cross-node Change
Notification.
• Disk quotas.
• 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 ser ver
and
over multiple CIFS servers sharing the same filesystem.
• Paging I/O. This is reads and writes initiated by the memory mana ger, 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 c ached by the Windows cache manager.
• Removable devices.
• Reparse points. PSFS filesystems can be mounted on mount points residing on NT FS filesystems.
• Security descriptors. Security updates are immediately a nd simultaneously applicable to all
servers in the cluster. Note that System ACLs and filesystem auditing are not supported.
• Sparse file API.
• Unicode file names.
Filesys
tem implementation differences
Althoug
hthe PSFS filesystem is a standard Windows filesystem and suppor ts standard filesystem
operat
ions, it differs from the NTF S filesystem in certain areas. Also, certain Windows utilities and
applications cannot manipulate a PSFS filesystem in the sam e 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 discar d any alternate data streams such as summary properties.
• File encryption and compression. This behavior is consistent with the FAT filesystem.
• Automatic generation of DOS 8.3 filename entries for “long” filenames. Name tunneling is
also not supported.
• 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.
• Pagefilessuchaspagefile.sys cannot be placed on a PSFS filesystem.
• Removable media.
• Use as the boot filesystem.
• The following Disk and File Management features provided in Windows 2003 R2: File Server
Management, Microsoft Services for Network File System, F ile Server Resource Manager.
• The Active Directory features provided in Windows 2003 R2.
HP StorageWorks Clustered File System 3.6.0 WSS Edition (software-only) release notes
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