I'm attempting to split my chaindata files across two Samsung T5 SSDs. Mounted the new SSD at /media/t5 and copied the 'ancient' chaindata subdirectory files with
cp -r /var/lib/goethereum/geth/chaindata/ancient /media/t5/ancient
changed group and file ownership of ancient and contents to geth changed permissions on ancient directory to 755
Changed geth.service file:
ExecStart=geth --http --syncmode fast --cache 1024 --datadir /var/lib/goethereum --datadir.ancient /media/t5/ancient
Did a daemon-reload and restarted geth
Fatal: Failed to register the Ethereum service: gap (#11992073) in the chain between ancients and leveldb
Should I have stopped geth before copying those files? Was cp -r not the correct way to copy the directory? Or is there some other step I missed?