HP StorageWorks Clustered File System 3.6.0 Windows Storage Server Edition (server/software bundle) Release Notes (403107-008, February 2008)

• Cached and non-cached file acc ess.
• Case-insensitive naming.
• Case-sensitive naming.
• Content indexing. PSFS support is the same as the FAT filesystem. (See “Unsupported Features”
for more information.)
• Directory Change N otification (DCN). 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 da ta over a single CIFS server
and
over multiple C IFS servers sharing the same filesystem.
• 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 exa mples 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, cer tain Windows utilities and
applic
ations 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.
• Fi le 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 i ndexing ser vice uses the NTFS change journal to determine
when to update the indices. In the PSFS files ystem, 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.
HP StorageWorks Clustered File System 3.6.0 WSS Edition (server/software bundle) release notes
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