When a client requests a block not cached locally, from where is the data retrieved?

When a client requests a block not cached locally, from where is the data retrieved?

• A. The origin volume
• B. The local cache is used first
• C. A remote backup volume
• D. The client request is queued until cache is populated

Answer: (A)

When a client asks for a block that isn’t in the local cache, the system fetches it from the origin volume—the actual storage location where the data resides. The cache is a fast-access layer, so a miss triggers a read from the origin, the data is returned to the client, and a copy is typically loaded into the cache for faster future accesses. This avoids pulling from a remote backup and doesn’t queue the request; the origin volume is the source of truth for the data.

When a client asks for a block that isn’t in the local cache, the system fetches it from the origin volume—the actual storage location where the data resides. The cache is a fast-access layer, so a miss triggers a read from the origin, the data is returned to the client, and a copy is typically loaded into the cache for faster future accesses. This avoids pulling from a remote backup and doesn’t queue the request; the origin volume is the source of truth for the data.