Question 1

When testing an external LUN with default mapping on two paths, performance appears constrained and the utilization of the RAID group in the external storage system never exceeds 35% busy no matter how many test threads are generated. You want to increase the utilization of the external RAID group. Which two actions will accomplish this task? (Choose two.)

Accepted Answer

A)   Increase the external path LUN queue depth setting.
B)   Increase the number of LUNs mapped from the external RAID group.
C)   Change Cache Mode to "Disabled".
D)   Increase the server HBA LUN queue depth to 64. A,C

Question 2

Your customer has an HDP pool dedicated to interactive production workloads. Which two applications are good candidates to share this HDP pool? (Choose two.)

Accepted Answer

A)   customer relationship management
B)   customer service call taking and dispatch
C)   software development  
D)   backup repository   A,C

Question 3

You are deploying an external storage system and its connection to a VSP G1000. The VSP G1000 has four external pools. You must ensure balanced utilization of the external storage system parity groups within each pool. What would you do to satisfy this requirement?

Accepted Answer

A)   Use only one external volume per external parity group with the default UVM queue depth.
B)   Slice each external parity group to provide a pool volume for each pool.
C)   Ensure that volumes from a parity group in an external system are exclusively associated with the same external parity group in the storage system connected to the host.
D)   Provide eight paths for each volume presented by the external storage system to the storage system connected to the host. C

Question 4

DP-Vol LUNs are taken from an HDP pool deployed with 128 disks (16x4D+4D RAID groups). Access is random read. Which combination of FC paths, LUN Queue Depth, and number of DP-Vols will result in a per-disk queue of 4 within this pool?

Accepted Answer

A)   2 paths, a LUN Queue Depth of 16, and 32 DP-Vols
B)   2 paths, a LUN Queue Depth of 8, and 32 DP-Vols
C)   4 paths, a LUN Queue Depth of 8, and 32 DP-Vols
D)   4 paths, a LUN Queue Depth of 16, and 32 DP-Vols

Question 5

Your VSP G1000 customer has an HDP pool with 600 GB drives and they need more IOPS in the pool. Which action will satisfy the requirement?

Accepted Answer

A)   Spread the pool over storage tiers.
B)   Add 1.2 TB drives to the pool.
C)   Add more 600 Gb drives of the same type.
D)   Create a new HDP pool.

Question 6

Which two conditions will cause high Cache Write Pending on a VSP G8000? (Choose two.)

Accepted Answer

A)   over-utilized external storage
B)   high port utilization
C)   inadequate WAN bandwidth for TrueCopy Asynchronous
D)   attempting to write to a RAID group at a rate beyond its ability

Question 7

A customer plans to migrate an interactive application from a VSP to VSP G1000. The application has consistent access across all its capacity with low hit rates and no particularly high I/O access areas. The application latency must be less or equal to 1.5 ms. Which configuration do you recommend to satisfy the requirements?

Accepted Answer

A)   an HDT pool consisting of SAS 10K and FMD drives
B)   an HDP pool with FMD drives
C)   an HDP pool consisting of NL-SAS and FMD drives
D)   an HDP pool consisting of external LDEVs provisioned on a VSP F400 system

Question 8

In a database environment, the system administrator complains that high write response times are triggering frequent automated alerts. However, utilization for processor, paths, and array groups is low. Database users are not complaining. What causing this problem?

Accepted Answer

A)   The RAID level is inappropriate.
B)   The storage system has too few processors.
C)   The storage media devices are too slow.
D)   Asynchronous destaging of writes occurs in bursts.

Question 9

A customer complains about high response times. This occurs frequently with bursts of write I/O at 6,000 IOPS for 10 second periods during each minute. The write response is 60 ms during these 10 second periods. The average IOPS rate reported by Hitachi Tuning Manager over 1 minute is 600. In this scenario, what is the average response time over 1 minute?

Accepted Answer

A)   10 ms
B)   30 ms
C)   60 ms
D)   90 ms

Question 10

A VSP G1000 customer is concerned about high VSD utilization alerts during their nightly backup and application maintenance window. To address their concerns, you want to inform them about the maximum acceptable utilization level range. What would be the range in this scenario?

Accepted Answer

A)   30-40%
B)   40-50%
C)   50-60%
D)   80% or higher

Question 11

A VSP G1000 performance analysis shows that server response times for virtualized volumes are high, 100 ms and higher, but HDD utilization rates in an external HUS 150 never exceed 35%. There are no processor or path constraints in the configuration. The workload is steady and stable. Which two actions will optimize this configuration? (Choose two.)

Accepted Answer

A)   Increase the external path LUN queue depth in the VSP G1000.
B)   Spread the server load across more and smaller LUNS per RAID group in the HUS.
C)   Break up each HUS LUN into several smaller volumes in the VSP G1000.
D)   Migrate the HUS LUNs to RAID groups with faster HDDs.

Question 12

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

Accepted Answer

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.

Question 13

Response times in an HDP pool have been increasing consistently with each additional workload during a large scale migration. The response times may become unacceptable with subsequent migrations. The purchase of additional equipment is an acceptable solution. What are two valid actions in this scenario? (Choose two.)

Accepted Answer

A)   Increase the pool free space and alert thresholds to the maximum permitted levels.
B)   Expand the pool with volumes from new parity groups to reduce utilization levels.
C)   Apply the SOM to provide tier property information that assesses suitability for HDT and deployment of flash.
D)   Use more, smaller, pool LDEVs per parity group to improve the efficiency and utilization of the queues.

Question 14

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

Accepted Answer

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.

Question 15

A customer has a VSP G800 storage system with an HDT pool with internal SAS drives and a virtualized third-party array using SATA RAID 6. The virtualized array is connected to the VSP G800 using four 8 Gbps FC paths. The customer reports performance problems on an OLTP application deployed on a virtualized server using the HDT pool. What are two reasons for this problem? (Choose two.)

Accepted Answer

A)   The workload includes significant random writes to SATA over RAID 6.
B)   The tier relocation is not assisting the OLTP application.
C)   The size of Tier 1 is not sufficient to accumulate all of the hot pages.
D)   The speed of the FC links is insufficient.

Question 16

A customer has several Oracle databases with different workload profiles residing on old HUS systems. The customer wants to consolidate workloads on a new VSP G800 system to increase database performance and to reduce costs. Which configuration would you use to accomplish this task?

Accepted Answer

A)   Put all of the databases in a single HDT pool.
B)   Put each database in its own HDT pool.
C)   Put databases with the same workload profile together in their own HDT pool.
D)   Put all database tablespaces and indexes in the first HDT pool, all redo logs in the second HDT pool, and all undo logs in a third HDT pool.

Question 17

A customer has an HDP pool with four array groups and 600 GB SAS drives operating at 85% utilization. Four array groups of the same configuration were added to the pool. In this scenario, which metric should be reviewed to validate optimal pool performance?

Accepted Answer

A)   pool total IOPS
B)   pool I/O profile
C)   pool array group utilization
D)   pool read/write ratio

Question 18

You are recommending RAID 6 to a customer for a non-database HDT pool. What are two reasons for this recommendation? (Choose two.)

Accepted Answer

A)   When capacity is pooled; the whole pool is affected when one parity group fails.
B)   RAID 6 provides the most efficient use of system processor resources.
C)   RAID 6 minimizes exposure to double disk failure.
D)   RAID 6 provides the optimum overall performance of all RAID types.

Question 19

A customer with a VSP G1000 is using HDT with SAS 15K drives and external storage. The customer wants the daytime response-sensitive workload to benefit from tiering. They also want to minimize the impact of relocations on the daytime operation itself. In this scenario, which action will satisfy the requirements?

Accepted Answer

A)   Enable monitoring only during the daytime hours (9:00 AM to 5:00 PM)  and only enable relocation at other times.
B)   Disable monitoring during daytime hours (9:00 AM to 5:00 PM) 
C)   Enable active flash so that all relocations can be completed in short bursts.
D)   Use continuous mode with a 30-minute cycle time and define relocation during daytime hours (9:00 AM to 5:00 PM)  with a low relocation speed.

Question 20

A user with a diskless VSP G800 uses ShadowImage from the G800 with a virtualized VSP G200 system. Application performance suffers during the frequent ShadowImage resynchronization operations. What should be done to reduce the impact of the ShadowImage throughput in this scenario?

Accepted Answer

A)   Configure both sets of disks into an HDT pool and let the HDT scheme manage the different workloads.
B)   Define the ShadowImage target volumes to use dedicated external FC paths using dedicated RAID groups.
C)   Set Copy to 15.
D)   Increase the VSP G800 cache size to improve the application cache hit rates.

Exam 1: Hitachi Vantara Certified Expert Performance architect