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Dell SPEED Guru Exams > SPEED Powerstore Exam > Flashcards

SPEED Powerstore Exam Flashcards

1
Q

What is the result of a dual fan failure in the PowerStore base enclosure?

A

The system will shut down gracefully

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2
Q

What is a performance benefit of enabling Jumbo frames on Ethernet networks?

A

The network can package more payload with the same amount of header and footer, thereby increasing network efficiency.

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3
Q

When selecting workload profiles within PowerStore Sizer, what IO size is selected when choosing the Exchange 2010+profile?

A

32K

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4
Q

PowerStore X supports block services and customer VMs. Choose the best description of the PowerStore X architecture.

A

PowerStore X natively runs ESXi, and runs block services in a VM.

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5
Q

How many SAS SSD drives can be used within the PowerStore base enclosure?

A

None

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6
Q

How would you define NVMe?

A

NVMe is a new interface standard that works directly with PCIe, and is more efficient than older SAS or SATA standards.

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7
Q

Which modules are NOT supported in an I/O module slot on each PowerStore node?

A

4-port 12Gb SAS for expansion SAS SSD enclosures

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8
Q

In PowerStore, how can you enforce a RAID Resiliency Set to use an 8+1 stripe size on a new system?

A

Initialize the system with at least 10 drives

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9
Q

Which drive(s) should be used when designing a PowerStore system for a customer?

A

Determine if the customer needs SCM drives or SSD drives, because these two drive types cannot be mixed in the same system.

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10
Q

The PowerStore Base System Container (BSC) runs in a Docker container that is stored where?

A

On the primary M.2 device in each node.

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11
Q

What is the purpose of the USB port in the PowerStore embedded module (mezzanine)?

A

System recovery or password reset

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12
Q

If an application with data reduction of 4:1 requires 100,000 IOPS at 8KB size, 70% read, and 100TB block storage with FC connectivity, what’s the minimum PowerStore system recommended to support that?

A

3000T

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13
Q

Your customer has a large NAS environment and will need multiple PowerStore appliances to meet the performance and capacity requirements. How would you recommend that these be configured?

A

Install the systems as independent clusters, since only the master appliance in a cluster can run file services.

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14
Q

What’s the most granular sample frequency of performance data available using PSTCLI commands?

A

(Five minutes)

One minute

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15
Q

In a PowerStore T system running in Unified mode, why is it recommended to configure at least 2 NAS Servers?

A

(With only a single NAS Server, high availability protection cannot be provided for File resources.)

A NAS Server uses compute resources from only 1 node at any given time; at least 2 NAS Servers are needed to ensure that both nodes contribute to File performance.

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16
Q

When the PowerStore system detects that a drive is NOT available, what action is taken?

A

(The system immediately begins to rebuild from RAID parity onto the hot spare drive.)

The system tracks any writes to that drive for 5 minutes, to see if the drive comes back online.

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17
Q

PowerStore uses dual active controllers and ALUA optimal/non-optimal paths to provide highly available storage. Which statement best describes this configuration?

A

Both controllers actively service I/O, with any given storage resource being primarily serviced by only 1 node. In failure situations, the surviving controller will service all I/O for all resources.

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18
Q

In a PowerStore 1000, considering slot IDs 0 to 24, what drive(s) are supported in slot 24 of the base enclosure?

A

NVMe NVRAM only

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19
Q

When does the PowerStore system apply data reduction techniques to customer data?

A

Compression and deduplication occur during write cache destage, as the dirty entries in cache are being copied out to the storage drives.

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20
Q

What is the maximum number of front end iSCSI ports per PowerStore node?

A

(8)

16

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21
Q

During installation, you connect the PowerStore Fibre Channel ports to a 4Gb switch infrastructure. What do you have to consider in this scenario?

A

You must use 16Gb SFP’s to negotiate a 4Gb connection

22
Q

NVMe NVRAM drives temporarily store data that has been written to the PowerStore system, but not yet permanently stored on the storage drives. How is this data protected from accidental loss due to hardware or environmental failures?

A

Data is written to a mirrored pair of drives to protect against drive failure, and each member of the mirror receives backup battery power from a different node.

23
Q

When configuring a new PowerStore system, which RAID type and width would you recommend to your customer?

A

None; RAID protection is automatically applied and managed by the system at install time.

24
Q

When a host sends a write request to the PowerStore system, when does PowerStore send the host ACK?

A

(After the data has been applied to the NVMe SSD drives.)

After the data is copied into memory on the peer node.

25
Q

Which best describes the purpose of the embedded module on each PowerStore node?

A

(The embedded module contains ports for Service and MGMT access, and a slot for an additional I/O module.)

The embedded module contains ports for Service and MGMT access, and a 4-port Ethernet card for storage access.

26
Q

What is the purpose of the battery backup unit (BBU) in a PowerStore system?

A

Provides enough power to run the NVMe NVRAM drives long enough for them to complete their backup.

27
Q

What is the best reason to initially install a PowerStore system with at least 10 data drives?

A

Fewer than 10 drives increase cost to capacity ratio.

28
Q

When provisioning PowerStore storage to externally attached hosts, what steps are needed to ensure proper performance?

A

Verify that any attached hosts are properly configured, by checking the Host Configuration Guide.

29
Q

Your customer configured their PowerStore T system in Block Optimized mode to get the best possible performance for their Fibre Channel-attached database servers. They now wish to create an NFS share to host their build servers. How should you advise the customer?

A

Once the system has been initialized as Block Optimized, it can no longer run file services, and cannot be converted to Unified mode without a full re-initialisation by support.

30
Q

What is required to enable adding a SAS expansion enclosure to a configuration in PowerStore Sizer?

A

(There is no restriction to when you can add SAS SSD drives.)
You need between 6 and 10 NVMe slots occupied.

31
Q

What is NOT supported on the PowerStore embedded module (mezzanine)?

A

(4 port 10Gbe BaseT option)

10Gb Optical SFP’s

32
Q

What is the purpose of the “Performance Policy” setting on block storage resources in PowerStore?

A

Performance Policy determines compute resource scheduling during times of contention; less critical resources should be set to “Low”.

33
Q

In PowerStore Sizer using the System Advisor path, what additional workload characteristics are required when using the advanced input method?

A

(Random read and write distribution.)

Random versus sequential, and latency.

34
Q

When might you consider advising a customer to deploy the PowerStore T system in Block Optimized Mode?

A

When the customer knows they will never need file sharing services.

35
Q

For what purpose are NVMe NVRAM drives used in PowerStore?

A

(NVRAM drives are used as temporary cache for the most active data regions)

Incoming writes are immediately copied to NVRAM drives before being acknowledged to the host

36
Q

Describe the method that PowerStore uses to encrypt customer data.

A

PowerStore uses self-encrypting drives that encrypt data when it is written to the storage medium.

37
Q

Describe the role of external networks in determining PowerStore performance capabilities.

A

Improperly designed or configured networks can lead to issues with both performance and availability of storage resources.

38
Q

If using NVMe SCM drives in the PowerStore base enclosure, what is the maximum number of NVMe SSD or SAS SSD drives that can be added?

A

SCM drives are exclusive to the base enclosure and do NOT support mixing with any other drive type

39
Q

When sizing a PowerStore X using PowerStore Sizer, what user inputs affect the total number of Virtual machines supported?

A

Input of vCPU count and CPU utilization.

40
Q

If a PowerStore system was initialized with 8 NVMe SSD drives resulting in an underlying RAID configuration for data of RAID5 4+1, what would result in the RAID width changing to the capacity efficient 8+1?

A

The RAID width is set at initialization and cannot be changed.

41
Q

In PowerStore, what is the preferred location when using the 32Gb Fibre Channel I/O module?

A

Slot 0

42
Q

When can file systems be extended and shrunk in PowerStore?

A

File systems can be extended and shrunk at any time, and changes take effect immediately.

43
Q

In the PowerStore UI, historical performance data extends back how long?

A

(30 days)

Up to 2 years

44
Q

What is the primary advantage of using RAID Resiliency Sets (RRS) in the PowerStore mapped RAID implementation?

A

(RAID policies can be applied per RRS, in order to maximise performance and available capacity.)

The PowerStore system will place metadata and data into separate RRS, in order to avoid I/O contention.

45
Q

How does PowerStore provide scale-out performance capabilities?

A

Multiple appliances can be clustered together to provide aggregated performance capabilities.

46
Q

A PowerStore 9000T system has a greater performance potential than a PowerStore 1000. How is this achieved?

A

PowerStore 9000 has more memory than a PowerStore 1000, and uses CPUs that have more cores and higher clock speed.

47
Q

What is one of the primary benefits of using multipathing software on hosts that are connected to a PowerStore system?

A

Multipathing software provides high availability capabilities, and potentially lowers latency and increases performance potential.

48
Q

Describe the appropriate guidance for when to enable compression in a PowerStore system.

A

Compression and deduplication are always on; there is no need (or capability) to enable or disable it.

49
Q

Your customer wants a PowerStore system that will only be used for file access. What configuration recommendations can you provide?

A

The customer should plan to configure multiple NAS Servers and multiple file systems, so that both nodes are actively serving the workload.

50
Q

What is the significance of drive slots 21 through 24 in the base enclosure of a PowerStore system?

A

These slots contain the NVMe NVRAM drives that provide persistent storage for write cache.

Dell SPEED Guru Exams (8 decks)

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