DES-1B31 Specialist - Systems Administrator, Elastic Cloud Storage (ECS) Practice Questions
Prepare for DES-1B31 with more than an answer.
- 1
Which process allows ECS to reconstruct objects within a storage pool, if that pool loses a disk?
Show answer details
Correct answer: B
B
- 2
A storage administrator is designing a multi-site ECS federation to support a global content repository. The requirement is to ensure that data written to Site A is immediately available for read operations at Site B to support a follow-the-sun workflow. Which replication group consistency setting must be selected to meet this requirement?
Show answer details
Correct answer: B
Strong Consistency ensures that once a write is acknowledged, any subsequent read from any location in the federation will return that data. This is required for workflows demanding immediate global availability. Eventual consistency allows for a delay in replication where reads might return stale data temporarily.
- 3
An organization requires strict multi-tenancy for their ECS deployment. They need to ensure that 'Finance' and 'HR' departments are completely isolated, manage their own bucket quotas, and have distinct identity sources. What is the optimal architectural approach to achieve this?
Show answer details
Correct answer: C
Namespaces are the primary logical construct for multi-tenancy in ECS. They allow for isolation of users, buckets, and management configurations. Assigning a Namespace Administrator allows each department to manage their own resources and identity providers (like AD) independently within their namespace.
- 4
A systems administrator observes that a specific ECS node is in a 'Suspect' state. While troubleshooting, they notice that the node is still responding to ping requests but storage services are intermittent. What is the most likely impact on the cluster during this state?
Show answer details
Correct answer: B
In the 'Suspect' state, the ECS fabric is unsure of the node's health. To protect data integrity, the system typically stops directing new writes (allocations) to that node while it attempts to determine if the node is truly down or just experiencing transient network issues. It does not immediately trigger a full reconstruction (which happens in 'Down' or 'Failed' states) to avoid unnecessary overhead.
- 5
During the configuration of a new ECS system for a financial institution, the security team mandates that all management traffic must be separated from data traffic. Which network configuration step is essential to achieve this?
Show answer details
Correct answer: B
ECS supports network separation where the Management traffic (portal, SSH, internal control) and Data/Public traffic (S3, NFS, Swift) run on different VLANs and subnets. This is configured during the initial installation or network setup phase to ensure isolation.
- 6
A customer is using ECS with Isilon CloudPools. They notice that performance for recalling archived files is lower than expected. Upon investigation, you find the ECS is performing heavy garbage collection. Which ECS feature or setting should be tuned or checked to optimize the interaction for this specific workload?
Show answer details
Correct answer: D
While Box-carting improves write performance for small files (common in CloudPools), if the issue is recall performance during heavy garbage collection (GC), the GC throttle is the relevant factor. Heavy GC consumes system resources (disk IO/CPU). Tuning the GC aggressiveness or scheduling can help prioritize client read operations.
- 7
Which user can lock and unlock nodes through the ECS Portal or the ECS Management API?
Show answer details
Correct answer: C
Reference: http://doc.isilon.eom/ECS/3.2/AdminGuide/ecs t lock nodes.html
- 8
What is a characteristic of ECS buckets when configured to allow access through S3 and NFSv3?
Show answer details
Correct answer: D
