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E20-820 - CLARiiON Solutions Expert for Technology Architects - Dump Information

Vendor Name : EMC
Exam Code : E20-820
Exam Name : CLARiiON Solutions Expert for Technology Architects
Questions and Answers : 138 Q & A
Updated On : March 23, 2017
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E20-820 Demo and Sample

Note: Answers are below each question.
Samples are taken from full version.



A customer wishes to make a local copy of its 512 GB production LUN for a single test. The copy will be mounted to the production UNIX host. The customer requires a solution with minimal disruption to its application. What do you recommend?

  1. Create a snapshot of the production LUN, and start a session. Add the session to the production host's storage group. Change the volume label and mount.

  2. Clone the production LUN. Fracture the clone. Add the clone to the production host's storage group. Change the volume label and mount.

  3. Take the production LUN offline. Perform a full SAN Copy. Add the destination LUN to the production host's storage group, and restart the application.

  4. Use an Incremental SAN Copy session on the production LUN. Add the destination LUN to the production host's storage group. Mount the volume.

Answer: B


Your customer is using SnapView to provide backup images (snaps and clones) of various host data across five CX3-40s. Recently they upgraded the CLARiiONs to FLARE release 26. Previously their scripts took care of the SnapView snap sessions and clone re-syncing, and ran without incident in the SnapView environment. Those same scripts now fail, with errors that the customer is saying are related to permissions. What is the cause of the failure?

  1. Theagent.config file does not exist in the Navisphere Agent directory.

  2. Theagent.config file does not exist in the Navisphere CLI directory.

  3. The Navisphere security file does not exist in the user home directory.

  4. The usernames and hostnames do not appear in theCLARiiON SP privileged user list.

Answer: C


A customer with a CX3-20f has recently started using SnapView snapshots and immediately noticed an increase in write response times on the LUNs being snapped. What should be the long-term write response time impact of the active snapshot sessions?

  1. The impact will decrease over time.

  2. The impact will fluctuate, decrease then increase over time.

  3. The impact will increase over time. 59

  4. The impact will stay the same over time.

Answer: A


A user fractures a clone and presents it to a secondary host. However, the data on the clone LUN does not contain the same data as the production host at the time of the fracture. What is the most likely cause?

  1. The application and file system buffers on the production host were not flushed prior to the fracture.

  2. The appropriate file system repair utilities on the production host were not performed prior to the fracture.

  3. The Consistent Fracture feature was not enabled on the source LUN.

  4. The file system on the production host must beunmounted prior to the fracture.

Answer: A


The customer starts a SnapView session of a production database LUN and log LUN. The snapshot is immediately activated and presented to a secondary host for testing purposes. The production host experiences significantly higher write response times, but the response time does improve over time. What is the most likely cause?

  1. A high number of disk crossings occur if the RLP LUNs are less than 10% of the size of the source LUN.

  2. The COFW activity is generally highest at the start of a session.

  3. The random nature of a database causes the host write I/Os to be smaller at the start of a session.

  4. The write cacherehit ratio is always smaller at the start of a session.

    Answer: B

    QUESTION: 135

    A customer's clone restore script has lines that perform the following operations:

    1. Check that the clone is fractured

    2. Flush the clone buffers 60

    3. Flush the Source LUN buffers

    4. Take the Source LUN offline

    5. Start the reverse synchronization

    6. Bring the Source LUN online

      What would you add to the script to ensure more reliable operation?

      1. A delay between steps 2 and 3 to allow the clone buffers to complete flushing

      2. A delay between steps 3 and 4 to allow the Source LUN buffers to complete flushing

      3. A delay between steps 4 and 5 to allow the Source LUN to transition to the offline state

      4. A delay between steps 5 and 6 to allow the reverse synchronization to start

Answer: D


A customer keeps data on a 512 GB 4+4 RAID 1/0 LUN. The customer will use a SnapView snapshot for backup purposes, and keep the session active for the full 24-hour period between backups. You investigate its environment and determine the following:

The application generates random 4 KB I/Os, with a read/write ratio of 3:1 The average seek distance is 35 GB

The application generates a throughput of 200 IOPS for 10 hours per day and is idle for the remaining 14 hours

You need to estimate the size of the Reserved LUN Pool and the write throughput of the Reserved LUN Pool. What is the best initial estimate?

  1. 120 GB, with fifty 64 KB writes/s and one hundred 8 KB writes/s

  2. 150 GB, with one hundred 128 KB writes/s

  3. 200 GB, with two hundred 4 KB writes/s and fifty 64 KB writes/s

  4. 512 GB, with two hundred fifty 4 KB writes/s

Answer: A


A company wants to use SAN Copy over a 10 Mb/s IP connection over a Brocade 7500 FC/IP router. The SAN Copy I/O size will be 512 KB and the round-trip latency is 0.425 second. After completing the design, it is determined that they will have bandwidth problems. They cannot increase the bandwidth. What can be done to improve the data transfer between two sites?

  1. Change the SAN Copy buffer size to 2048 bl6o1cks

  2. Enable the Fast Write feature on the Brocade device

  3. Set the number of default sessions to 4

  4. Set the Throttle value to 10 for all SAN Copy sessions

Answer: B


A SAN Copy session (full) has been started to replicate a single 2 TB LUN in a customer environment:

Source LUN is offline

Source array and target array are connected to the same FC switch A single 400 MB/s SAN Copy connection has been established There is no contention on the link

The SP utilization of the source and target arrays is less than 30%

After one hour, 1.3 TB has been replicated. What action might be taken to increase the replication rate?

  1. Decrease the data compression value on the FC switch

  2. Increase the SAN Copy throttle value

  3. Increase the write cache value on the target array

  4. No action necessary: replication rate is close to maximum

Answer: D


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