Enables CIFS overlapping opens.

None

Enable overlapping opens to obtain better performance with applications that perform multiple opens on the same file (for example, CAD applications). By default, this setting is disabled.

With overlapping opens enabled the SteelHead optimizes data where exclusive access is available (in other words, when opportunist locks are granted). When an opportunist lock (oplock) is not available, the SteelHead does not perform application-level latency optimizations but still performs SDR and compression on the data as well as TCP optimizations. Therefore, even without the benefits of latency optimization,SteelHeads still increase WAN performance, but not as effectively as when application optimizations are available.

If a remote user opens a file that is optimized using the overlapping opens feature and a second user opens the same file, they might receive an error if the file fails to go through a v3.x.x or later SteelHead or if it does not go through a SteelHead (for example, certain applications that are sent over the LAN). If this occurs, you should disable overlapping opens for those applications.

You can configure an include list or exclude list of file types subject to overlapping opens optimization with the protocol cifs oopen extension.

The no command option disables CIFS overlapping opens.

SteelHead CX, SteelHead EX, SteelHead-v, SteelHead-c