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E20-655 Isilon Specialist Exam for Platform Engineers

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EMC · E20-655

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Question 1

Single choice

A customer wishes to install a new cluster and needs an explanation of the features SmartConnect will provide.

Which explanation best represents its features?

A
SmartConnect manages loads across the cluster by directing connections to nodes.
B
SmartConnect moves connections from one node to another to balance loads across the cluster.
C
SmartConnect connects users with nodes based on identity and authorization.
D
SmartConnect connects users with nodes based on protocols and protocol versions.

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Question 2

Single choice

You are supporting a customer's cluster with 3 node pools consisting of 10 S200 nodes, 18 X400 nodes, and 30 NL400 nodes. The customer is going to write a large number of 4MB files to the X400 node pool.

The customer is very concerned about minimizing the amount of overhead.

Which setting would be best for minimizing the amount of overhead?

A
N+2:1 or N+2 have the same amount of overhead.
B
N+2:1 will have less overhead.
C
I/O optimization should be set to Random.
D
I/O optimization should be set to Streaming

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Question 3

Single choice

What is a potential result of increasing the level of logging detail on your cluster?

A
You could fill up the limited space in the /var directory.
B
You could fill up the limited space in the /tmp directory.
C
There is no way to do this without recompiling the kernel.
D
You will create an unsupported condition on the cluster.

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Question 4

Single choice

Which condition could make it necessary to reset the CELOG DB?

A
/var partition is >95% full
B
Always required as part of an upgrade from OneFS 6.0 to 7.x
C
The LNN rebooted causing the master coalescer function to move
D
The master coalescer nodes ext-2 interface was added to a different subnet.

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Question 5

Single choice

On which node that has external network access does the master isi_celog_coalescer service run?

A
The node with the lowest LNN
B
The first node that receives an event
C
The node with the highest LNN
D
Any random node in the cluster

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Question 6

Single choice

Which statement best describes an advantage of the link aggregation control protocol (LACP)?

A
Balances outgoing traffic across the active ports and accepts traffic from any active port
B
Next active port in link becomes new master port if original master port becomes unavailable
C
The only aggregation method that can increase single stream performance
D
Does per packet load balancing across aggregated links

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Question 7

Single choice

How is the job engine's coordinator designated?

A
The job daemons on each node attempt to lock a file and the one that succeeds becomes the coordinator.
B
The nodes share performance data with the job daemons and the daemon on the node with the lightest load becomes the coordinator.
C
The storage administrator selects a node to run the coordinator based on the cluster architecture.
D
The job daemons generate random numbers, and the one that generates the lowest number becomes the coordinator.

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Question 8

Single choice

When setting up SmartConnect initially in DNS, what type of record needs to be created for a SmartConnect Zone?

A
NS
B
MX
C
A
D
AAAA

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Question 9

Single choice

How much summarized historical performance data can InsightIQ present?

A
1 year's worth
B
2 years' worth
C
6 months' worth
D
Unlimited

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Question 10

Single choice

A customer needs to upgrade their 6 node Isilon cluster from OneFS 7.0 to OneFS 7.1 with minimal disruption.

What would be the best way to upgrade the cluster?

A
Perform a simultaneous upgrade of all nodes
B
Perform a rolling upgrade of all nodes
C
Perform a simultaneous upgrade of 1 node at a time
D
Perform a rolling upgrade of 2 nodes at a time

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Question 11

Single choice

A customer has a cluster on which round robin link aggregation has been implemented. The customer reports that throughput has decreased since implementation.

What is the likeliest explanation for the result?

A
Packets may arrive out of order and need reordering at the client side.
B
Packets are being lost on each node's second interface and need retransmission.
C
The client side also needs to be configured to handle round robin link aggregation.
D
The switch needs to reroute each alternating packet, introducing latency.

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Question 12

Single choice

A customer has configured a job to have a high impact level.

How will the job engine react to this action?

A
It will allocate additional resources to the job when it runs.
B
It will not pause the job for higher priority jobs.
C
It will preserve the impact level if node load levels are too high.
D
It will lower the priority level if node load levels are too high.

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Question 13

Single choice

What is the default size of the /var/log partition?

A
500MB or 2GB depending on the version of OneFS.
B
As defined by parameters set in the node initialization wizard.
C
As large as the cluster size minus the production data.
D
500MB by default or more if configured by an administrator at setup.

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Question 14

Single choice

The customer has configured a file pool policy on their OneFS 7.0 cluster to place files over 30 days old in the archive tier with a file protection of N+3. The customer attempts to verify the file location and protection setting on a file matching the file pool policy criteria using the isi get -DD command. The file is located on the performance tier and has a requested protection setting of N+2:1.

What is the most likely cause of the issue?

A
The order of the file pool policies
B
The default policy overrides the file pool policy
C
The AutoBalance job is paused
D
The FlexProtect job failed to complete

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Question 15

Single choice

Which log file contains information about possible drive errors?

A
isi_radish.log
B
diskpools.log
C
isi_hdfs_d.log
D
isi_hwmon.log

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Question 16

Single choice

What folder structure is used to store log files in AVP?

A
Customer Name > Cluster Name > Upload Date
B
Customer Name > Upload Date > OneFS Version > Cluster Name
C
Customer Name > SR Number > Node Name-Number
D
Customer Name > Upload Date > Node Name-Number

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Question 17

Single choice

The SmartConnect Service IP acts as which component of the DNS system?

A
Authoritative Name Server
B
Root Server
C
Recursive Resolver
D
Reverse Lookup Zone

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Isilon Specialist Exam for Platform Engineers

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