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file-partition.md

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File Partition:

Since the blockchain is around ~140GB, storage of large files on an external drive is convenient.
If this is not done properly though, the external drive will also contain high i/o-frequency LevelDB index files, protracting time for initial blockchain synchronization. This document describes how partition datadir files between the high-frequency/low-capacity "index" files and the low-frequency/high-capacity "blocks" files. Examples are given for macOS, but Linux / Windows should be similar. These instructions result in the following physical folder rearrangement:

Original Location New Location Capacity Needs i/o Frequency
${datadir}/blocks/index ${datadir} low high
${datadir}/blocks ${EXTERAL} high low

Change "username" in the follows as appropriate for your macOS Bitcoin administrative account ("coinadm" in this example conf file).

  1. Start bitcoind with datadir pointing to your internal drive:

     bitcoind -daemon -conf=macos-bitcoin.conf -datadir=/Users/coinadm/local/bitcoin/data

    Let it run for a few minutes, or long enough that it has started syncho- nizing. Either tail the debug.log, or watch the blocks folder:

     ls -l /Users/coinadm/local/bitcoin/data/blocks/blk00000.dat
 -rw-------  1 coinadm  staff  134191893 Jul 27 11:31 /Users/coinadm/local/data/blocks/blk00000.dat

  2. Stop bitcoind, so that we can rearrange some datadir folders:

    kill -QUIT `cat /Volumes/WD-Passport-Mac/bitcoin/data/bitcoind.pid`

  3. Move the Bitcoin LevelDB index folder up one level (so that it may remain on the internal drive).

       mv -f /Users/coinadm/local/bitcoin/data/blocks/index /Users/coinadm/local/bitcoin/data/

  4. Next, move the Bitcoin blockchain blocks folder off the internal drive:

       mkdir /Volumes/WD-Passport-Mac/bitcoin 
   mv -f /Users/coinadm/local/bitcoin/data/blocks /Volumes/WD-Passport-Mac/bitcoin

Finally, set up soft links to restore the original folder structure:

Folder Name Link Name
${EXTERNAL}/blocks/index ${datadir}/../index
${datadir}/blocks ${EXTERAL}/blocks

  1. Replace the original index folder location with a soft link:

       ln -s /Users/coinadm/local/bitcoin/index /Volumes/WD-Passport-Mac/bitcoin/blocks/index

  2. Replace the original index folder location with a soft link:

       ln -s /Volumes/WD-Passport-Mac/bitcoin/blocks /Users/coinadm/local/bitcoin/data/blocks

注意 - Nota - Note - ध्यान दें - ﻢﻠﺣﻮﻇﺓ - метка These instructions are confusing due to the way the LevelDB "index" folder is nested within the blockchain "blocks" folder by default.