A proposed SRDF/S solution was modeled with BCSD. The model assumed that the source array had two RFs. The RA Utilization chart shows the maximum utilization is at 80%.
How many RFs should be recommended to ensure a successful implementation?
A. 2
B. 3
C. 4
D. 6
A customer is using SRDF/S with one Symmetrix VMAX in each data center. An application is doing 10,000 4 KB IOPS with 40% writes and is using multiple volumes. Assume an RA port can handle a maximum of 4,000 4 KB IOPS.
Based on best practices, how many RAs are needed for this application?
A. 1
B. 2
C. 4
D. 8
You are designing a Symmetrix VMAX SRDF/S over Fibre Channel solution. The production and remote data centers are 50 km apart.
What is the expected write response time delay due to latency?
A. 0.25 ms
B. 0.5 ms
C. 1 ms
D. 2 ms
What is the effect of block size on response times in an SRDF/S environment?
A. Smaller block size applications experience lower response times
B. Larger block size applications experience lower response times
C. Larger block size applications have the same response times as smaller block size applications
D. Block size has no effect on response times
Your customer is adding a new database application. You are asked to design a solution to expand the current SRDF/S implementation on the customer's two Symmetrix VMAX arrays to account for this growth. As part of the sizing, you notice that the two RA ports are at 85% utilization.
What should you tell your customer that the solution requires?
A. At least two more RAs are required
B. At least one more RA is required
C. No additional hardware is required
D. More memory is required
An SRDF/S implementation is being designed. The application is doing 6,000 4 KB IOPS with 30% writes and uses multiple volumes. Assume that the RA performance limits are 3,800 4 KB IOPS for a Fibre RF adapter.
How many RFs are recommended?
A. 1
B. 2
C. 4
D. 6
You are designing an SRDF/S solution. Network bandwidth can be purchased in increments of single OC3 (155 Mb/s) links. Data compression is not in use. The workload profile is as follows:
Total I/Os per second = 30,000 Read block size = 4 KB Write block size = 4 KB Writes = 30%
How many OC3 links should be recommended?
A. 2
B. 4
C. 6
D. 8
What is the effect of block size on response times in an SRDF/S environment?
A. Larger block size applications experience higher response times
B. Smaller block size applications experience higher response times
C. Larger block size applications have the same response times as smaller block size applications
D. Block size has no effect on response times
You are designing a Symmetrix VMAX SRDF/S over GigE solution. The production and remote data centers are 100 km apart.
What is the expected write response time delay due to latency?
A. 0.5 ms
B. 1 ms
C. 2 ms
D. 4 ms
You are designing an SRDF/S over Fibre Channel solution. Data centers are 50 km apart and 4 Gb/s FC links are in place.
What is the minimum number of buffer-to-buffer credits required to maximize the utilization of the links?
A. 25
B. 50
C. 100
D. 300
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