HP StorageWorks Enterprise File Services WAN Accelerator - Manual (Page 31)

HP S TORAGE W ORKS EFS WAN A CCELERATOR M ANAGEMENT C ONSOLE U SER G UIDE 31
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3. Use the controls to complete the configuration, as described in the following table.
4. Click Apply to apply your settings to the running configuration. (Apply your
settings to test a new configuration before committing it to memory.)
5. Click Save to write your settings to memory or click Reset to return the settings to
their previous values.
Control Description
Latency Optimization Enable CIFS Optimization. CIFS optimization is enabled by default. Only uncheck this
box if you want disable CIFS optimization. Typically, you disable CIFS latency
optimization to troubleshoot problems with the system.
Write Optimization Disable Write Optimization. Check this box to disable write optimization.
Disable write optimization only if you have applications that assume and require write-
through in the network. If you disable write optimization, the appliance still provides
optimization for CIFS reads and for other protocols, but you might experience a slight
decrease in overall optimization.
Most applications operate safely with write optimization because CIFS allows you to
explicitly specify write-through on each write operation. However, if you have an
application that does not support explicit write-through operations, you must disable it in
the appliance.
If you do not disable write-through, the appliance acknowledges writes before they are
fully committed to disk, to speed up write operation. The appliance does not
acknowledge the file close until the file is safely written.
Transparent Pre-population Enable Transparent Pre-population Support. Check this box to enable transparent
pre-population.
To enable transparent pre-population, you must install and run the HP Copy Utility
(RCU) to pre-populate data on the client and server. Because the data has already been
copied to the client and server, the appliance only copies new data, increasing
optimization of traffic across the WAN. The RCU is available for download from the HP
support site at http://www.hp.com.
Security Signature Optimize Connections with Security Signatures (that do not require signing). Check
this box to disable Windows Server Message Block (SMB) signing.
The Secure-CIFS feature enables you to automatically disable Windows Server Message
Block (SMB) signing. SMB signing prevents the appliance from applying full
optimization on CIFS connections and significantly reduces the performance gain from
an HP EFS WAN Accelerator deployment. Because many enterprises already take
additional security precautions (such as firewalls, internal-only reachable servers, and so
forth), SMB signing adds little additional security, at a significant performance cost
(even without appliances).
Before you enable Secure-CIFS, you must consider the following factors:
• If the client-side machine has Required signing, enabling Secure-CIFS prevents the
client from connecting to the server.
• If the server-side machine has Required signing, the client and server connect but you
cannot perform full latency optimization with the appliance. Domain controllers
default to Required.
For detailed information about SMB signing and the performance cost associated with it,
see the HP StorageWorks Enterprise File Services WAN Accelerator Installation and
Configuration Guide.