HP CIFS File Locking Interoperation

8.3 Auspex NeTservices

Auspex markets a NAS server called 4Front NetServer 2000. Auspex is an Advanced Server

for UNIX OEM customer of AT&T, and their version of Advanced Server is the NeTservices

UNIX/Windows consolidation product, running on UNIX on the 4Front NS 2000 server.

AT&T Advanced Server is also the OEM source for HP’s AS/9000 product.

NeTservices runs on a UNIX operating system, but like NetApps and EMC, appears to be a

single-purpose NAS server. Thus, NeTservices can provide concurrent file access for

Windows and NFS clients, but does not support UNIX users or applications on the server.

NeTservices file locking implementation appears to be based upon Advanced Server for

UNIX, which provides byte range locking interoperability for Windows and NFS. NFS access

must adhere to the advisory locking protocol.

Advanced Server for UNIX also enables oplocks, but for Windows-only client access.

However, enabling oplocks automatically disables UNIX/NFS locks.

Based upon Auspex and Advanced Server documentation, NeTservices provides the following

file locking ability:

Mandatory Share Mode (Open Mode) Auspex NeTservices

Lock Windows Yes

Lock UNIX – no advisory locking Not Applicable

Lock UNIX – advisory locking Not Applicable

Lock UNIX/NFS – no advisory locking No

Lock UNIX/NFS – advisory locking No

Lock PC-NFS No

Byte Range Locking

Lock Windows Yes

Lock UNIX – no advisory locking Not Applicable

Lock UNIX – advisory locking Not Applicable

Lock UNIX/NFS – no advisory locking No

Lock UNIX/NFS – advisory locking Yes

Lock PC-NFS No

Oplocks

Break Oplock for Windows access Yes

Break Oplock for UNIX access – no

advisory

Not Applicable

Break Oplock for UNIX access - advisory Not Applicable

Break Oplock for UNIX/NFS – no advisory No

Break Oplock for UNIX/NFS – advisory No

Break Oplock for PC-NFS No

Auspex NeTservices provides Mandatory Share Mode (open mode) locking for Windows

clients only. CIFS/9000 has a planned enhancement to interoperate Windows Mandatory

Share Mode (open mode) locking with UNIX, UNIX/NFS, and PC-NFS.