Free EX260 sample questions

Correct answer: cephadm bootstrap --mon-ip

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.

Correct answer: Zonegroup

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.

Correct answer: Rules

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]

Correct answer: k=4, m=2

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).

Correct answers: The parent snapshot must be protected.; The layering feature must be enabled on the parent image.

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.

Correct answer: True

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.