HCE-3700 Online Practice Questions and Answers

A 10K RPM Small Form Factor 600 GB disk drive has a 3 ms average rotational latency and a 4 ms average seek time.

How many random read IOPS would you expect from a 4D+4D RAID group using these drives before any consideration for cache hits or queuing optimization benefits?

A. approximately 570 IOPS

B. approximately 1,140 IOPS

C. approximately 1,530 IOPS

D. approximately 2,280 IOPS

Which two port options are bi-directional on a VSP G800? (Choose two.)

A. Replication-Target (RCU)

B. Open Target (TAR)

C. External Target (eLUN)

D. Mainframe (FICON)

A customer using a small block interactive workload on a VSP G200 complains about poor application performance. They use an FC SAN which consists of 8 Gbps and 16 Gbps FC switches.

What are two causes of the performance issue? (Choose two.)

A. Front-end ports of the VSP G200 are connected to the 8 Gbps FC switch.

B. The front-end FC ports are used by another bandwidth-intensive application.

C. The host HBA has an insufficient queue depth setting.

D. The multi-pathing software uses round robin balancing algorithm.

Which two statements are true regarding HDP pools? (Choose two.)

A. Using the largest possible pools is a recommended practice.

B. Exposure to failure and recovery from failure must be considered when recommending the maximum size of a pool.

C. HDP pools can be used for sizing HDT pools.

D. Tier migration is based on performance and space capacity.

Which three statements are true regarding the Hitachi external storage architecture? (Choose three.)

A. Enabling Cache Mode increases exposure to problems with high Cache Write Pending.

B. Enabling Cache Mode allows destaging asynchronously from host I/O.

C. Enabling Cache Mode always improves performance.

D. A System Option mode can force in sequence destaging even when destaging asynchronously.

E. Disabling Cache Mode for an external LDEV eliminates the use of cache.

A user reports fluctuating LUN response times every day between 8:00 AM and 9:00 AM as users arrive and log in.

How do you identify this condition using Hitachi Tuning Manager?

A. View LUN response times and RAID group utilization (% busy) averaged over the 60 minutes.

B. View the random write counts every minute.

C. View LUN response times and RAID group utilization (% busy) every minute.

D. View LUN response times and correlate against the Cache Write Pending level every 15 minutes.

A mission critical SQL server application that resides in a three-tier HDT pool is showing response time spikes that may be related to I/O activity.

Which three Hitachi Tuning Manager reports would you use to determine the problem? (Choose three.)

A. IOPS by dataset.

B. IOPS by V-Vol

C. IOPS by pool

D. IOPS by tier

E. IOPS by parity group

How does the HDLM Extended Round Robin algorithm impact sequential I/O?

A. It continues to use the same path for a user-specified count of sequential I/O requests.

B. It remembers a user-determined number of addresses to better implement sequence detection for the storage.

C. It buffers and reorders I/O requests to improve sequence detection by the storage.

D. It makes a path decision for every I/O request.

For a VSP G1000 system serving a mission critical interactive workload, which two statements are true about VSD failover? (Choose two.)

A. The VSD receiving the workload of a failed VSD is not pre-determined.

B. Providing reserved capacity to accommodate failure is a requirement when planning for capacity for normal operations.

C. The workload of a failed VSD board always transfers to its redundant partner VSD board.

D. The workload of a failed VSD board is dynamically redistributed among surviving VSD boards.

An experienced system administrator reports near maximum MPB utilization with VSP G400 arrays operating in a GAD pair. Each array is supporting 100K IOPS with a 50% read workload. The MPBs should be capable of supporting more than 200K IOPS with this profile according to the basic array sizing tools.

Which two statements are correct in this scenario? (Choose two.)

A. Cache mirroring between the two G400 arrays generates an extra MPB load which is not recorded in Hitachi Tuning Manager.

B. Each G400 array is also processing 50K duplex write IOPS from the other G400.

C. The duplex GAD writes are changing the overall read/write I/O profile and the extra parity operations are causing the high MPB utilization.

D. The internal array queue management scheme for GAD write operations causes MPB utilization to be doubled.