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nanoreth/book/run/troubleshooting.md
Alexey Shekhirin 4a13415f92 feat(book): advise to tee the output of mdbx_chk (#4360)
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Troubleshooting

As Reth is still in alpha, while running the node you can experience some problems related to different parts of the system: pipeline sync, blockchain tree, p2p, database, etc.

This page tries to answer how to deal with the most popular issues.

Database

Database write error

If you encounter an irrecoverable database-related errors, in most of the cases it's related to the RAM/NVMe/SSD you use. For example:

Error: A stage encountered an irrecoverable error.

Caused by:
   0: An internal database error occurred: Database write error code: -30796
   1: Database write error code: -30796

or

Error: A stage encountered an irrecoverable error.

Caused by:
   0: An internal database error occurred: Database read error code: -30797
   1: Database read error code: -30797
  1. Check your memory health: use memtest86+ or memtester. If your memory is faulty, it's better to resync the node on different hardware.
  2. Check database integrity: 
    git clone https://github.com/paradigmxyz/reth
cd reth
make db-tools
db-tools/mdbx_chk $(reth db path)/mdbx.dat | tee mdbx_chk.log
    If mdbx_chk has detected any errors, please open an issue and post the output from the mdbx_chk.log file.