IBM System Storage DS8000 Technical Solutions V3 : C4090-453

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IBM System Storage DS8000 Technical Solutions V3 Sample Questions:

1. A customer wants to place some HDDs in a DS8870. The customer also wants to enable Easy Tier with SSD for all HDDs, but wants to minimize the amount of SSDs purchased.
Which option would be valid?

A) IBM recommends a 2:1 ratio of HDDs to SSDs, so the customer should purchase half the number of SSDs compared to the number of HDDs purchased.
B) IBM never recommends less than 50% of the configured drives be SSD, so the customer should match the number of HDDs with the same number of SSDs.
C) SDDs come in full drive sets (16 drives). Purchasing a single full drive set, if configured properly, would enable all the HDDs to be in an Easy Tier pool at the lowest cost.
D) SSDs come in half drive sets (8 drives). Purchasing a single half drive set, if configured properly, would enable all the HDDs to be in an Easy Tier pool at the lowest cost.

2. When I/O Priority Manager is enabled, each volume in a D38800 is assigned to a performance group at the time of the volume creation.
What action will the DS8800 take to ensure that the most important volumes as defined to I/O Priority Manager receive the highest level of system resources available?

A) delay I/Os with lower performance policies
B) allocate additional cache for volumes with higher performance policies
C) invoke Easy Tier for higher performance policy I/Os
D) move volumes with higher performance policy I/Os to faster disks or SSDS

3. A potential D68870 customer asks the technical specialist which extent size is used to relocate hot extents from normal SAS disk resources to SSDs because they want to understand IBM's adjustment compared to the other high end disk suppliers.
Which is the extent size used for DSS000 Easy Tier data relocation?

A) 1 GB
B) 2 BG
C) 8 GB
D) 256 MB

4. The DS CLI can be invoked in which three modes?
1.Single-shot command mode
2.Interactive command mode
3.Script command mode
4.Background command mode

A) 2, 3, 4
B) 1, 3, 4
C) 1, 2, 3
D) 1, 2, 4

5. A potential DS8OIJO customer would like to understand the size of the non-volatile storage (NVS) as compared to the overall size of the DS8000 processor memory.
Which technical feedback to the customer is correct?

A) NVS size is a part of the SARC algorithm and adapts automatically depending on the actual workload of the customer
B) NVS size can be adjusted according to customer demand using the CLI
C) NVS size is 1/32 scale (in minimum 1 GB) of the overall processor memory
D) NVS size is 4 GB for all cache sizes up to 64 GB. and 16 GB for all overall cache sizes over 64 GB

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