What is the purpose of the TRIM/UNMAP process?

Question

Options

• ACollects vSAN log files
• BRepairs internal cache errors
• CDeletes orphaned snapshots
• DReclaims disk space

• A
  3% (1)
• B
  7% (2)
• D
  90% (27)

Explanation

TRIM (for SSDs) and UNMAP (for thin-provisioned storage) are storage commands that notify a storage device or array which blocks of data are no longer in use, allowing that space to be reclaimed and reused - making D the correct answer. In virtualized environments like vSAN, when a VM deletes files, the storage layer isn't automatically told those blocks are free; TRIM/UNMAP explicitly communicates that, enabling the underlying storage to reclaim that capacity.

• A is wrong because log collection is handled by tools like vm-support bundles or Log Insight, not a storage reclamation process.
• B is wrong because cache error repair involves separate health/remediation mechanisms (e.g., vSAN health checks or cache device rebuild), not TRIM/UNMAP.
• C is wrong because orphaned snapshot cleanup is a separate VM management task performed through vCenter or the snapshot manager, unrelated to block-level storage commands.

Memory tip: Think of TRIM/UNMAP as "telling the storage, I don't need these blocks anymore - take them back." The key word is reclaim - whenever you see reclaim + disk space on an exam, think TRIM/UNMAP.

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