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EMC E20-554 Exam Syllabus Topics:

EMC Isilon Design Specialist Exam for Technology Architects Sample Questions:

1. You are asked to size a cluster for a file sharing environment. nfsstat indicates that no more than 10% of the requests are namespace operations (e.g. GETADDR, SETADDR). There will be 10,000 active Linux users, connecting over NFS.
Which cluster configuration would you recommend?

A) Ten X200 (27 TB) 48 GB RAM, 600 GB SSD, N+2:1
B) Five X400 (120 TB) 96 GB RAM, 2.4 TB SSD, N+2
C) Eight X200 (36 TB) 24 GB RAM, no SSD, N+2:1
D) Ten X400 (60 TB) 48 GB RAM, 2.4 TB SSD, N+2:1

2. Your customer has observed a degradation in response time while browsing for media files within the Production Media folder on the Isilon cluster. That directory now contains over five million files. It was confirmed that there are no network or edit station related causes.
What changes to the Isilon cluster will best accelerate the browsing performance?

A) Upgrade network interfaces on the nodes to 10 Gbps
B) Upgrade RAM on the nodes
C) Add an A-Series Performance Accelerator node
D) Add Solid State Drives (SSDs) to the nodes

3. A customer has grown 2 PB in the last year. The cluster performs well most times of the day, but occasionally during the day, the customer notices a decrease in performance. You have been told that 'tree-deletes' are taking too long and can only be run on weekends.
What would you recommend to speed up the 'tree-deletes'?

A) Use an A100 node for added CPU performance to help with 'tree-deletes.'
B) Add an SSD node tier for metadata to account for at least 2% of RAW capacity
C) Add an SSD tier for metadata, ensuring all nodes have SSDs.
D) Add 20% more nodes to the cluster to help with degraded performance.

4. A potential customer requires 4 PB of usable capacity to store media files. The workloads are a combination of streaming video delivery and long term archive of video assets.
There is very little space available in the customer's datacenter, so physical density is very important. The customer is concerned about performance impact and potential data loss when using 3 TB or larger drives.
What Isilon capabilities can address the customer's concerns?

A) Isilon nodes have more drives per rack unit so fewer shelves are required.
Proactive hot sparing eliminates most drive rebuilds.
N+3 and N+4 Protection Levels exceed traditional RAID6 availability.
B) Isilon does not perform rebuilds - data reprotection is typically 2x-3x faster than traditional RAID
rebuilds.
N+3 and N+4 Protection Levels exceed traditional RAID6 availability.
Data redistribution runs faster with more nodes in the cluster.
C) Isilon does not perform rebuilds - data reprotection is typically 2x-3x faster than traditional RAID
rebuilds.
Data recovery is consistent, taking the same amount of time regardless of cluster size.
Isilon 'short strokes' 4TB drives to reduce rebuild time.
D) N+3 and N+4 Protection Levels exceed traditional RAID6 availability.
Proactive hot sparing eliminates most drive rebuilds.
Endurant Cache reduces the overhead for write operations.

5. In your second meeting with the customer you ask the following questions about their current unified SAN and NAS platform.
"Are you using an application to map users from NFS Exports to SMB shares? Is each site a separate LDAP or AD Domain?"
What functionality are you trying to understand in their environment and what is the comparable feature in IsilonOneFS?

A) Identity Mapping and Authentication Sources
B) User Management and AD Authentication
C) NFS Export Management and OneFS Cluster Management
D) Kerberos Infrastructure and Identity Management

Solutions: