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Title: Power Failure During IBD - Verifying Data Integrity Post by: keystroke on May 12, 2023, 06:54:01 PM I recently experienced a power failure while performing the Initial Block Download onto a Samsung T7 solid state drive, which was partitioned for ext4 and mounted with the default data=ordered journaling option. My node was running with the following parameters: -txindex=1 -blockfilterindex=1 peerblockfilters=1.
The node started back up without any issues. However, I am concerned about the possibility of data corruption (blocks, indexes, etc.) due to the power failure. To be on the safe side, I've decided to restart the node with -checkblocks=0 -checklevel=3 options to verify the integrity of the stored data. Is this enough to ensure that no data has been corrupted due to the power failure? Or should I consider taking additional steps to verify the integrity of my node data? Thank you in advance for your help! Title: Re: Power Failure During IBD - Verifying Data Integrity Post by: nc50lc on May 13, 2023, 03:54:10 AM Is this enough to ensure that no data has been corrupted due to the power failure? Or should I consider taking additional steps to verify the integrity of my node data? -checklevel can be set up to level 4, see if you need the highest level of verification: https://github.com/bitcoin/bitcoin/blob/9d85c03620bf660cfa7d13080f5c0b191579cbc3/src/validation.cpp#L92-L99 (https://github.com/bitcoin/bitcoin/blob/9d85c03620bf660cfa7d13080f5c0b191579cbc3/src/validation.cpp#L92-L99)In case there's a corrupted data due to power-failure, it's usually those latest block, block index, chainstate that are being written before the power failure. So ideally, Bitcoin Core should be able to detect those with the default parameters. Title: Re: Power Failure During IBD - Verifying Data Integrity Post by: mendace on May 15, 2023, 07:52:58 PM If the node restarts successfully without reporting errors or data corruption, that's a good sign that data integrity has been preserved. However, for added security, you might consider performing additional verifications or checks, for example by using specific verification tools such as "bitcoin-cli verifychain" or "bitcoin-cli -checklevel=4".
Title: Re: Power Failure During IBD - Verifying Data Integrity Post by: nc50lc on May 16, 2023, 05:43:16 AM -snip- for example by using specific verification tools such as "bitcoin-cli verifychain" or "bitcoin-cli -checklevel=4". -checklevel is a command line option that should be added to your node, not an rpc command.It has to be used with either bitcoind or bitcoin-qt. It's also worth mentioning that both will use the default which will only check the last 6 blocks, So to mimic OP's procedure, you'll need to add "0" value 'nBlocks' arg to verifychain command to verify everything. |