Chapter 4 FCIP over IP/MPLS Core

Conclusion

Table 4-2

Application Requirements

 

 

 

 

 

 

 

 

 

Disk mirroring

 

Varies depending on

< 1–5 ms for

Synchronous or

Synchronous

 

 

storage array.

synchronous.

asynchronous.

applications are very

 

 

Typically maximum 50

Asynchronous

 

sensitive to delay.

 

 

MB per storage array.

replication tolerates

 

Asynchronous are

 

 

 

 

less sensitive to

 

 

 

higher latency (100

 

 

 

 

 

delay.

 

 

 

ms).

 

 

 

 

 

 

 

 

 

 

 

 

File access

 

OS dependent.

 

 

Depends on the OS

 

 

 

 

 

and application

 

 

 

 

 

above it.

 

 

 

 

 

 

In addition to those listed in Table 4-2, other requirements include provisioning, error monitoring, and end-to-end management.

Remote Tape-Backup Applications

In an enterprise network, certain sites (remote branches or small offices) can have a small SAN that connects a few servers to the storage arrays. Backing up and restoring these servers over the WAN is a fundamental component of disaster recovery operations. Extending tape backup over a wide area imposes stringent requirements for efficient tape backup and recovery operations. These requirements include no data loss, low latency and jitter, monitoring of the link, and high security.

Slow wide area links can increase backup time and can make it impossible to complete backup within the allocated time period (or “window”). Distance is not a major limitation for backup to tape applications as long as it is possible to predict delay requirements. For backup to tape to be as efficient as possible, Cisco recommends sustaining a certain speed so that a continuous stream of data is sent to tape. Backup performance has been found to be best when the tape can accept a continuous stream. Backup to tape transfer over the WAN is asymmetrical in nature. The asymmetrical nature of tape-backup data transfer creates unique challenges when designing SAN extension networks.

Tape “pipelining” technology helps to extend tape drives thousands of kilometers, thus making remote tape backup an essential component of business continuance and disaster recovery applications. The efficiency is achieved by implementing buffering and error-recovery mechanisms. The concept is similar to spoofing; even though the server and tape controller are separated by a large distance, they behave as if they are co-located. The tape pipelining technique relaxes the design constraints of SAN extension technologies.

A typical solution includes transport over MPLS, which provides all the necessary QoS requirements required by tape backup applications. The Cisco solution provides necessary provisioning, management, bandwidth optimization, and performance parameters that are critical to implement tape backup applications. The Cisco solution can scale as bandwidth requirements increase and still maintain the QoS requirements required to support this application.

Conclusion

IP is becoming a protocol of choice to transport storage traffic across WANs and MANs. The IP/MPLS networks of SPs can be used to transport FCIP and iSCSI efficiently for disaster recovery and business continuance solutions. SPs can leverage their current infrastructure with out much modification to the network elements to transport FCIP and iSCSI. By providing storage services, SPs can increase the utilization of their network while providing value-added services.

 

Data Center High Availability Clusters Design Guide

4-30

OL-12518-01

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Cisco Systems OL-12518-01 manual Conclusion, Remote Tape-Backup Applications
Page 29

OL-12518-01 specifications

Cisco Systems OL-12518-01, also known as the Cisco Management Services for Wireless LAN Controller, is a key component for businesses seeking to enhance their wireless networking capabilities. This product offers a comprehensive management solution designed to ensure high performance and security of wireless networks.

One of the main features of OL-12518-01 is its centralized management interface, which simplifies the deployment and operation of multiple access points across an organization. This centralized approach allows network administrators to manage all wireless devices from a single pane of glass, significantly improving operational efficiency and reducing the potential for human error.

The product is built upon various robust technologies that enhance its performance. It includes advanced features like Quality of Service (QoS) support, which prioritizes bandwidth for critical applications. This ensures that mission-critical operations run smoothly, even in environments with high user density. Furthermore, the Wireless LAN Controller supports a variety of security protocols, including WPA3, ensuring that user data and wireless networks are protected against unauthorized access.

A significant characteristic of OL-12518-01 is its scalability. As businesses grow, their network requirements can change dramatically. The Cisco Management Services solution is designed to scale easily alongside the organization’s needs, allowing for the addition of more access points and the integration of advanced features seamlessly. This adaptability makes it suitable for both small businesses and large enterprises, ensuring consistent wireless connectivity across diverse spaces.

Moreover, OL-12518-01 features robust analytics and reporting capabilities. It provides valuable insights into network performance and user behavior, enabling administrators to make informed decisions about resource allocation and troubleshooting. With real-time monitoring tools, IT staff can quickly identify and resolve issues, minimizing downtime and enhancing overall user experience.

In summary, Cisco Systems OL-12518-01 is a powerful wireless LAN management solution that combines centralized management, advanced security features, scalability, and comprehensive analytics. These characteristics make it an ideal choice for organizations aiming to optimize their wireless networking performance while ensuring security and reliability in their operations. By investing in OL-12518-01, businesses can achieve a robust wireless infrastructure that meets their current and future needs.
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