Erigon Seg Integrity

Erigon Segment Integrity Check

The erigon seg integrity command runs integrity checks on an Erigon datadir to verify that snapshot and segment files are valid and consistent.

Prerequisites

1. Erigon must be stopped - The command requires exclusive access to the datadir
2. Binary must be built - Run /erigon-build first if the binary doesn't exist
3. Datadir must exist - A synced Erigon datadir with blockchain data

Command Syntax

./build/bin/erigon seg integrity --datadir=<path>

Replace <path> with the actual path to your Erigon data directory.

Available Flags

• --check — Comma-separated list of specific checks to run (default: all default checks)
• --skip-check — Comma-separated list of checks to exclude from the run
• --failFast — Stop after the first problem is found (default: true). Set to false to continue and collect all warnings
• --file-integrity-cache — Path to a cache file that speeds up repeated runs. Setting it also enables a torrent piece-hash verification pass before the checks
• --skip-check TorrentPieces — Skip that torrent verification pass; it is a named check like any other

Discovering Available Checks

The list of available checks is dynamic and changes over time as new checks are added or removed. Do NOT assume a fixed list. Instead, discover the current checks by running:

./build/bin/erigon seg integrity --help

Look at the --check flag description in the output — it lists all currently available check names.

Workflow

When the user wants to run integrity checks:

1. Ask for the datadir path if not already provided
2. Verify prerequisites
   • Check the datadir exists
   • Ensure Erigon is not running (file lock will prevent concurrent access)
   • Build the binary if needed
3. Discover available checks by running --help if the user wants to run or skip specific checks
4. Execute the command with the appropriate flags
5. Interpret the output — report any errors or warnings found

Examples

Run all default checks

./build/bin/erigon seg integrity --datadir=/data/erigon

Run a specific check only

First discover available checks via --help, then:

./build/bin/erigon seg integrity --datadir=/data/erigon --check=<check_name>

Skip a specific check

./build/bin/erigon seg integrity --datadir=/data/erigon --skip-check=<check_name>

Continue past failures instead of stopping

./build/bin/erigon seg integrity --datadir=/data/erigon --failFast=false

Important Notes

• File Lock: If Erigon is running, the command will fail due to file lock
• Long running: Integrity checks can take significant time on large datadirs, especially mainnet
• Torrent verification scope: With --file-integrity-cache set, the pre-pass scans <datadir>/snapshots recursively — top-level block segments plus caplin/, domain/, history/, idx/, accessor/. On a mainnet archive datadir that is roughly 2.6x the files of the top-level set; use --skip-check TorrentPieces to skip it
• Torrent verification exit code: --failFast=false only means "verify every file before giving up" — a piece-hash mismatch, a path under snapshots/ the scan could not read, or an interrupted run all still exit non-zero. A partial or failed scan is never reported as a pass
• Discover checks dynamically: Always use --help to find the current list of available checks rather than assuming fixed names