GCP Associate Cloud Engineer Practice Question

Your company must upload a 200-GB VM snapshot from an on-prem server to a regional Cloud Storage bucket. The WAN link is 200 Mbps and suffers occasional dropouts. You must minimize total transfer time while allowing the upload to resume from the last completed byte after any interruption, without retransmitting data already sent. Which gsutil command best satisfies these requirements?

gsutil -o "GSUtil:parallel_composite_upload_threshold=150M" cp snapshot.tar.gz gs://backup-bucket
gsutil rsync -d snapshot.tar.gz gs://backup-bucket
gsutil cp snapshot.tar.gz gs://backup-bucket
gsutil -m cp snapshot.tar.gz gs://backup-bucket

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Answer Description

Parallel composite uploads split a large object into multiple component chunks that are uploaded simultaneously, maximizing available bandwidth. Each chunk is uploaded by a resumable upload session, so if the network drops only the affected chunk is retried, not the entire file. Setting the GSUtil:parallel_composite_upload_threshold property enables this behavior for objects larger than the specified size. Using the simple "cp" or "-m cp" commands uploads the file with a single resumable stream, which can resume but does not exploit parallelism, so transfer time is longer. "rsync" is intended for directory synchronization and would still upload serially. Therefore the command that both parallelizes and resumes efficiently is the one that sets the parallel_composite_upload_threshold option.

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