#!/bin/bash


# first of all create and mount a ramdisk, i.e.
# sudo mkdir -p /mount/point/folder -m 755
# sudo mount -o size=4G -t tmpfs tmpdir /mount/point/folder
# ajust the variables on this script

# point -blocksdir to ramdisk
# link all files from persistent storage 
# targeting blocks folder on ramdisk
# run this script on background to periodically flush 
# blk and rev files to persistent storage and link them
# make sure your pc doesnt run out of power
# I have a nobreak for that
# You can do a checkpoint by stoping bitcoind, and making a
# copy of chainstate and index folder and some blk and rev files
# After finishing up the sync,
# just copy all the real files from ramdisk to persistent storage

# get the blocks starting from BNBER
# 6 will let at least 6 blk and 6 rev files on ramdisk
BNBER=6
ACTUALDIR=/home/alice/bcdata/BTC/blocks
RAMDISK=/home/alice/temp/BTC/blocks

mkdir -p $RAMDISK
while true
do
    # iterate only over regular files, not folders nor links
    for blkfile in $(find $RAMDISK/blk*.dat  -type f -printf "%f\n" | sort -r | tail -n +$BNBER)
    do
        mv $RAMDISK/$blkfile $ACTUALDIR/$blkfile
        ln -s $ACTUALDIR/$blkfile $RAMDISK/$blkfile
    done
    for blkfile in $(find $RAMDISK/rev*.dat  -type f -printf "%f\n" | sort -r | tail -n +$BNBER)
    do
        mv $RAMDISK/$blkfile $ACTUALDIR/$blkfile
        ln -s $ACTUALDIR/$blkfile $RAMDISK/$blkfile
    done
    sleep 10m
done

$ ls blocks/index
000003.log  000004.log  CURRENT  LOCK  MANIFEST-000002

root@casa2:~# cat /etc/fstab
# <file system> <mount point>   <type>  <options>       <dump>  <pass>
# / was on /dev/sda5 during installation
UUID=85701e6a-0a36-4295-8f57-41bb44eb53bc /               ext4    noatime,nodiratime,errors=remount-ro 0       1
# /boot was on /dev/sda1 during installation
UUID=819cb633-8fa4-4384-843e-486d7ce3c53c /boot           ext4    defaults        0       2
# /home was on /dev/sda6 during installation
# partition with system
UUID=4551582e-57a9-4a4c-9a95-4b5e3d1df2d6 /mnt/hdd1       ext4    noatime,nodiratime        0       0

# 2nd partition,    mount /dev/sdb1 /mnt/hdd2
UUID=661363b3-eec9-4cf6-a1a0-0ee06df52604 /mnt/hdd2        ext4    noatime,nodiratime        0       0
# mergint the two mount points into home
/mnt/hdd1:/mnt/hdd2                       /home          fuse.mergerfs  fsname=mergerFS,use_ino,cache.files=off,dropcacheonclose=true,allow_other,category.create=mfs

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