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ASK THE EXPERT- STORAGE EXTENSIONS OVER OPTICAL

Welcome to the Cisco Networking Professionals Ask the Expert conversation. This is an opportunity to discuss Storage Extensions over Optical with Tony Antony. Tony is a Senior Technical Marketing Engineer with the solutions engineering group at Cisco Systems Inc. He has more than 14 years of telecommunications and data-networking experience. Tony's previous experience includes engineering positions at Texas Instruments, Knowledge LAB and KPMG. He has authored numerous technical papers at international conferences in the networking area. He also co-authored two books: 1) DWDM network design and Engineering technologies 2) First mile Access networks and enabling technologies. His research interests include optical Internet and network simulations. Remember to use the rating system to let Tony know if you have received an adequate response.

Tony might not be able to answer each question due to the volume expected during this event. Our moderators will post many of the unanswered questions in other discussion forums shortly after the event. This event lasts through April 9. Visit this forum often to view responses to your questions and the questions of other community members.

12 REPLIES
Silver

Re: ASK THE EXPERT- STORAGE EXTENSIONS OVER OPTICAL

Hi Tony,

How do I determine what type of SAN transport is best for my customers?

Thanks,

Tom

New Member

Re: ASK THE EXPERT- STORAGE EXTENSIONS OVER OPTICAL

Tom,

Determining which transport technology for SAN extension greatly depends upon the applications your customers are using to extend across the transport layer and the performance needed for that application. For applications doing synchronous replication around 200KM or less that require moving large volumes of data DWDM is the most efficient underlying transport layer. For applications doing asynchronous replications across 300KM or more moving large/medium volumes of data SONET would be the transport layer of choose. For applications that move low volumes of data and can leverage an existing IP layer between data centers, IP transport is the logical choice

New Member

Re: ASK THE EXPERT- STORAGE EXTENSIONS OVER OPTICAL

Tony,

What is the difference between replication and mirroring?

Thanks,

Bill

New Member

Re: ASK THE EXPERT- STORAGE EXTENSIONS OVER OPTICAL

Bill,

Replication is a storage array based technology used to replicate writes from one array (either synchronously or asynchronously) to an array at another location, thereby protecting the data from site failure. In contrast, mirroring (also called RAID 1) is performed within an array to protect data from disk failure

Bronze

Re: ASK THE EXPERT- STORAGE EXTENSIONS OVER OPTICAL

Hi Tony,

How does Business Continuity and Disaster Recovery(BCDR) lower costs for the enterprise customer? Does it actually lower cost or not? Please explain.

Thanks

New Member

Re: ASK THE EXPERT- STORAGE EXTENSIONS OVER OPTICAL

It does..

Ensuring that employees have continuous access to business critical applications increases productivity and depending on their function (such as ordering applications in a call center) has a direct impact on increasing revenue. Primarily, cost savings is related to the enterprise Recovery Time Objective (RTO) and avoiding costs associated with downtime. Average lost revenue per outage hour is $944,000 plus.

Silver

Re: ASK THE EXPERT- STORAGE EXTENSIONS OVER OPTICAL

Hi Tony,

What Cisco optical products support Storage transport?

Thanks,

Tom

New Member

Re: ASK THE EXPERT- STORAGE EXTENSIONS OVER OPTICAL

CISCO ONS 15454 and CISCO ONS 15530/15540 line of products addresses most of the storage needs of both Enterprise and Service Providers.

More info: http://www.cisco.com/en/US/products/hw/optical/ps2011/index.html

New Member

Re: ASK THE EXPERT- STORAGE EXTENSIONS OVER OPTICAL

What is the difference between replication and mirroring?

Ron

New Member

Re: ASK THE EXPERT- STORAGE EXTENSIONS OVER OPTICAL

Simpson,

The answer was posted before - Reposting

Replication is a storage array based technology used to replicate writes from one array (either synchronously or asynchronously) to an array at another location, thereby protecting the data from site failure. In contrast, mirroring (also called RAID 1) is performed within an array to protect data from disk failure

New Member

Re: ASK THE EXPERT- STORAGE EXTENSIONS OVER OPTICAL

Tony, can you talk about how EMC SRDF and Veritas VVR will impact the SAN design, especially across the existing SONET or ATM infrastructure. Appreciate if you can point us to any white papers for them.

New Member

Re: ASK THE EXPERT- STORAGE EXTENSIONS OVER OPTICAL

Keith,

Even though SONET is independent of application (i.e SRDF etc) specific design there are certain considerations to be made as far as end to end SAN design.

The considerations include:

Application type (Async or Sync)

Delay requirements

Protection requirements

Spoofing (both on ATM and SONET) to extend reach of FC

Distance requirements between Storage locations and allowable delay for the application will impact the design. For example, if the maximum allowable delay (one way) for a synchronous application is approximately 500µs. This delay is divided between fiber propagation (~5µs / km) and processing delays at the transmission nodes. FCoSONET processing at end nodes typically adds 25µs of processing delay, while an intermediate (through node) may introduce ~10µs.

One of the advantages SONET/SDH can offer over higher layer methods (such as FCIP) is the delay predictability. (worst-case delay must be considered, including the fiber and node processing delays under protection switch scenarios).

Spoofing of FC acknowledgements by the transmission layer (SONET/ATM) nodes can extend the effective throughput over longer distances.

SONET protection mechanisms such as UPSR , 2F & 4F BLSR, 1+1 APS or Path Protected Mesh Network (PPMN) may be necessary to achieve the required level of network resiliency.

You can find more info here:

http://newsroom.cisco.com/dlls/prod_090803b.html

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