OpenStack OpenStack Storage (Cinder & Swift) 2

Question 1

What is Ceph RBD commonly used for in OpenStack deployments?

Accepted Answer

As a unified backend for Cinder block, Glance image, and Nova ephemeral storage

Answer

Ceph RBD (RADOS Block Device) is widely used as a unified storage backend for Cinder, Glance, and Nova in production OpenStack.

Question 2

What is the Swift 'ring' responsible for?

Accepted Answer

Determining the placement of objects, containers, and accounts across storage nodes

Answer

The Swift ring is a data structure that maps partition names to physical storage devices/nodes for data placement.

Question 3

Which Cinder feature allows a volume to be attached to multiple instances simultaneously (read/write)?

Accepted Answer

Multi-attach

Answer

Cinder multi-attach allows a single volume to be attached to multiple VM instances at the same time for shared access.

Question 4

In Swift, what does the term 'consistency' refer to?

Accepted Answer

Swift uses eventual consistency where replicas sync asynchronously

Answer

Swift uses an eventual consistency model where object replicas may temporarily be out of sync but converge over time.

Question 5

What is Cinder 'volume type' used for?

Accepted Answer

Defining storage characteristics (e.g., SSD, replicated, encrypted) for volume creation

Answer

Cinder volume types define storage quality-of-service characteristics like performance tier, replication level, or encryption.

OpenStack Practice Test