Specialist In Ceph Cloud Storage Free Sample Questions

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EX260 Sample Questions

  1. Question 1

    Beginner

    Install Red Hat Ceph Storage server · Install a containerized Red Hat Ceph Storage server

    A storage administrator is preparing to deploy a new Red Hat Ceph Storage 5 cluster using cephadm. The environment consists of 6 nodes: 3 for monitors/managers and 3 for OSDs. The administrator needs to bootstrap the initial cluster on the first node. Which specific command sequence successfully initializes the cluster and prepares it for adding subsequent hosts?

    Answer and explanation

    Correct answer: A

    In Red Hat Ceph Storage 5 and later, cephadm is the standard deployment tool. The cephadm bootstrap command is used to install the monitor and manager daemons on the first node, generating the necessary keys and configuration files to expand the cluster.

  2. Question 2

    Intermediate

    Provide object storage with RADOSGW · Deploy a multisite RADOS gateway

    An organization requires an object storage solution that supports high availability across two geographically separated data centers (East and West). The requirement is to have active-active replication where users can write to either zone. Which configuration object must be set up to group these two zones together to share a global namespace?

    Answer and explanation

    Correct answer: A

    A Zonegroup (formerly known as a region) consists of one or more zones. It defines the geographical boundary for replication. To enable active-active replication where buckets are shared across zones, the zones must be part of the same Zonegroup.

  3. Question 3

    Intermediate

    Configure a CRUSH map · Be able to create a bucket hierarchy

    A system administrator observes that a specific replicated pool 'rbd_prod' is consuming uneven amounts of space across the OSDs. While troubleshooting, they decide to analyze the CRUSH map. Which component of the CRUSH map is primarily responsible for defining the selection logic of how data replicas are placed across failure domains?

    Answer and explanation

    Correct answer: D

    CRUSH rules define the policy for data placement. They dictate the steps the algorithm takes to select OSDs (e.g., 'take root', 'chooseleaf host', 'emit'). While buckets define the topology, the Rule defines the logic of placement across that topology.

    graph TD Rule[CRUSH Rule] -->|Defines Policy| Selection Selection -->|Step 1| Root[Take default] Selection -->|Step 2| Domain[Chooseleaf firstn 3 type host] Selection -->|Output| OSDs[Result: OSD.1, OSD.5, OSD.9]
  4. Question 4

    Advanced

    Configure Red Hat Ceph Storage server · Create and configure erasure-coded pools

    You are configuring a new Ceph Block Device (RBD) pool for a virtualization workload. The workload requires high durability but must be cost-effective regarding storage capacity. You decide to use Erasure Coding. Which of the following profiles would withstand the failure of two OSDs simultaneously while minimizing the storage overhead compared to 3-way replication?

    Answer and explanation

    Correct answer: C

    In an Erasure Coding profile, 'm' represents the number of coding chunks (parity), which equals the number of simultaneous failures the system can tolerate. 'k' is data chunks. k=4, m=2 allows 2 failures. The overhead is (k+m)/k = 6/4 = 1.5x. This is significantly less than 3-way replication (3.0x overhead).

  5. Question 5

    IntermediateMultiple answers

    Provide block storage with RBD · Create an RBD clone

    A developer needs to create a snapshot of a Ceph Block Device (RBD) image named database-vol in the production pool. After creating the snapshot, they intend to create a new clone from it for testing purposes. Which prerequisites must be met before the clone can be created? (Select TWO)

    Answer and explanation

    Correct answers: B, D

    Before cloning, the snapshot must be protected to prevent it from being deleted while child clones exist. This ensures data integrity for the clones that rely on the parent snapshot.

    Cloning relies on the RBD layering feature (Copy-On-Write). This feature must be enabled on the image to support cloning operations.

  6. Question 6

    Beginner

    Provide block storage with RBD · Configure one-way RBD mirroring in image mode

    True or False: When configuring RBD mirroring in 'image mode', you must manually enable mirroring for each individual image you wish to replicate, whereas 'pool mode' automatically replicates all images in the pool.

    Answer and explanation

    Correct answer: A

    This is accurate. In 'pool mode', the mirroring configuration applies to the entire pool, and every image created within it is mirrored by default. In 'image mode', the pool is configured for mirroring, but the administrator must explicitly enable mirroring on specific images.

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