DAFS adds persistent and auto-recovery locks to help clients identify and recovery from this situation.
In addition to tools supporting client fail-over, DAFS provides for server fail-over, as well as migration mechanisms to accommodate failures, growth, and upgrades in 7x24 environments.
The DAFS changes involved in this remapping of how requests are transcribed are extensive, but they don't affect NFSv4 semantics at a fundamental level.
This approach, therefore, is intended for high-performance applications that are sensitive to either throughput or latency, or applications that can make use of the extended DAFS services made available through the user API.
If the file is on a DAFS file system, then the kernel passes the I/O request to the DAFS VFS/IFS, which issues DAFS requests to a server.
The advantage of this type of DAFS client implementation is that applications can use it transparently, just like other remote file system implementations (NFS, AFS, DFS for Unix, CIFS for WinNT/Win2k).
NetApp DAFS solutions allow customers to utilize highly scalable database storage solutions in conjunction with Sybase ASE, and be assured the solutions they are deploying integrate seamlessly.
Prior to announcing the DAFS Database Accelerator, Network Appliance and Sybase jointly released audited Transaction Processing Performance Council (TPC-C) results that set a new performance standard for real-world business environments.
DAFS takes advantage of the Emulex HBA's RDMA interconnect and its high-performance CPU handling protocol processing to enable enterprises to support larger workloads on existing systems.
Network Appliance(TM) DAFS Database Accelerator offers customers improved performance, a truly scalable architecture, and easier manageability for their database applications.
The integration of Emulex's HBA technology into the Network Appliance DAFS Database Accelerator solution marks an important step in our ongoing product development relationship with Network Appliance," said Gareth Taube, senior vice president, Emulex IP Storage Networking Group.
Database Accelerator -- Network Appliance is now shipping the DAFS
Database Accelerator, the world's first DAFS