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Posts Tagged ‘Optimization’

WAN Optimization:

Posted by Ravi shankar on February 24, 2009

WAN optimization will accelerate a broad range of application accessed by distributed users with the techniques of eliminating the redundant data transmission, stores data in local cache, compression and prioritizing data and streamlining chatty protocols.

Component techniques of WAN optimization:
WAFS: Wide Area File Services, CIFS Proxy, HTTPS Proxy , Media Multicasting, Web Caching and bandwidth management.

Description of WAN Optimization Techniques:

Compression:        Relies on data pattern that can be represented more efficiently.
Caching/Proxy:        Relies on the human behavior, accessing the same data over and over.
Protocol Spoofing:    BUndles multiple request from chatty application into one.
Traffic Shaping:    Control data usage based on spotting specific pattern in the data and allowing and disallowing specific traffic.
Equalizing:        Makes assumption on what needs immediate priority based on data usage.
Connection Limits:    Prevents access gridlock in router and access points due to denial of serviceor peer to peer.
Simple Rate Limits:    Prevents one user from getting more than a fixed amount of data.

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Cisco WASS for SharePoint Portal Server Optimization

Posted by Ravi shankar on February 15, 2009

Cisco WASS provides WAN optimization capabilities along with application specific acceleration, through devices that are deployed on each side of the WAN. These devices called Cisco WAE Wide Area Application Engine Appliance, are available as router-integrated network modules or as standalone appliances and are deployed out of the data path in the data center and remote office LAN.

Cisco WASS can optimize SharePoint Portal server 2003, improve performance, minimize WAN bandwidth consumption and improve productivity.

Optimization for SharePoint and other associated application is achieved through the following Cisco WASS features:

Application acceleration for Common Internet File System (CIFS) Protocol:

Through file data and Meta data caching, latency mitigation through technique such as read-ahead caching, and local message handling, Cisco WAE can accelerate access to document without incurring latency and bandwidth penalties caused by WAN.

Cisco Data Redundancy Elimination (DRE):

It eliminates the transfer of redundant data segment that have been previously identified. DRE is application independent and can identify pattern within flow from any TCP based application and later use those identified pattern to suppress redundant transmission. DRE is effective for document that is downloaded multiple times and also for document that have changes applied to them.

LZ compression:

To minimize bandwidth consumption, all data is compressed in transit. It can provide 2:1 to 5:1 compression.

Cisco Transit Flow Optimization (TFO):

TFO improves the behavior of TCP in WAN to facilitate high performance, reliability, efficiency when WAN is used. TFO terminates the TCP session locally and transparently optimizes flow that traverses the WAN, thereby shielding communication nodes from the limitation of WAN.

Cisco WASS dramatically reduces response time and bandwidth utilization, provides users with LAN-like access to SharePoint Portal Server and content, thereby improving productivity.

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