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Exam E20-017: Information Availability Design Specialist Exam for Data Center Architects

What is the approximate propagation delay for one write?

A company is planning to deploy synchronous array-based remote replication over Gigabit
Ethernet links. The workload profile of the application to be replicated is as follows:
3,000 IO/s
Read/Write Ratio = 70:30
Write block size = 4 KB
Distance between sites = 40 kilometers

——-Write-acceleration devices will not be used
What is the approximate propagation delay for one write?

what is the minimum supported recovery point objective?

A company plans to locate its primary production site and secondary disaster recovery site 500
kilometers apart. You are recommending a solution that includes the use of high-end storage
arrays running asynchronous replication. During the planning phase, you have estimated that:
The asynchronous replication minimum cycle time is set to 30 seconds.
It will take three hours to fail over to the secondary site’s hardware after declaring a disaster.
After the failover to the secondary site, it will take another two hours to bring up the applications.
Based on the information provided, what is the minimum supported recovery point objective?

how many replication channels are required for this solution when trunking is enabled?

A company is planning to deploy array-based synchronous remote replication between two sites
over 100 MB/s FC links. The two sites are 50 miles apart. Each replication channel can handle a
maximum of 1,000 IOPS. The workload profile of the application is as follows:
5,000 IO/s
Read/Write Ratio = 60:40
Write block size = 8 KB

If design best practices are considered, how many replication channels are required for this
solution when trunking is enabled?

What is the total amount of raw capacity that is required for this solution?

A database is utilizing ten 9 GB, RAID 1 devices. A cascade three-site remote replication solution
that includes synchronous and extended distance consistent PIT has been selected for disaster
recovery. All devices involved in remote replication will have RAID 1 protection.
What is the total amount of raw capacity that is required for this solution?


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