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Run, Dry Run, and Scan

The job page exposes three distinct execution modes.

Run

Run performs the live operation. This is the mode that consumes data allowance and applies real changes.

For jobs with Mirror data enabled, the first live run requires an additional confirmation because mirror mode can delete destination-only files. Copy-mode jobs do not require that deletion confirmation.

If Prevent overwrites is enabled on a copy-mode job existing destination files are never overwritten.

Before a live run starts, the confirmation overlay shows the current Mirror data, Prevent overwrites, and Delete excluded settings. If you change them there and click Start live run, MyGreat saves those changes to the job before queueing the run.

Dry Run

Dry Run is the safest first step when you want to understand what the live run would do without performing the transfer.

Use it when you want to review:

  • expected work size
  • likely run duration
  • filter impact
  • whether the job configuration looks safe enough for a live run

Scan

Scan is inventory and analysis focused. It helps you inspect source-side conditions such as naming issues, duplicates, timestamps, and oversized content before a live run.

For delta strategies, scan is also useful as a reconciliation check. Use it after fallback syncs, watcher resets, broad scoped syncs, or long-running change-feed monitoring periods.

When scan inventory contains enough independent folders or file groups, Migration Planning can propose multiple child jobs from the scan result. Automatic planning is calculated as scan inventory becomes available and is finalized after a successful scan.

Migration Planning creates job-set parts with generated inclusion filters so each part owns a specific source scope. Review the proposed parts, runner assignment, scheduling, and Mirror data setting before creating the jobs. Shared Runner Pools are not used for planned job parts; select a tenant Runner Pool or a dedicated Runner.

For a new job:

  1. Dry Run if you want live-run planning
  2. Scan if you want inventory analysis and remediation options
  3. Run when the configuration is ready

See also