After having finished the "Initial Block Download" I needed to reindex:

[BTC_Core_Expmnt]# bitcoind -reindex -datadir=/mnt/BTC_Core_Expmnt

The debug.log showed everything starting up ok; and the process beginning:

[2020-01-20T07:43:41Z Loaded 119369 blocks from external file in 6005ms\
2020-01-20T07:43:41Z Reindexing block file blk00001.dat...]

Then a while later this:

[2020-01-20T09:05:59Z Reindexing finished]

But bitcoind continued grinding on... Well then what is all this? ::

[2020-01-20T09:05:59Z Pre-allocating up to position 0x100000 in\
[rev00000.dat 2020-01-20T09:05:59Z UpdateTip: new best=\ 
[height=1 version=0x00000001 log2_work=33.000022 tx=2\
[date='2009-01-09T02:54:25Z' progress=0.000000 cache=0.0MiB(1txo)]

In any case it got to this point ::

[2020-01-20T09:59:00Z UpdateTip: new best=\
[height=359645 version=0x00000003 log2_work=82.893764 tx=71128141\
[date='2015-06-06T07:25:10Z' progress=0.143166\

Then it fell over ::

[2020-01-20T09:59:00Z *** Disk space is too low!
[2020-01-20T09:59:00Z Error: Disk space is too low!\
[Error: Disk space is too low!
[2020-01-20T09:59:00Z Failed to connect best block\
[ (Disk space is too low! (code 0)) ]

Which is odd, because there should still be 20GB free since the size of BTC_Core_Expmnt is supposed to be 300GB.

[BTC_Core_Expmnt]# du -h
102M    ./blocks/index
275G    ./blocks
56K     ./bitcoin-
60K     ./bitcoin-
64K     ./bitcoin-
73M     ./bitcoin-
8.0K    ./bitcoin-
440K    ./bitcoin-
74M     ./bitcoin-
16K     ./lost+found
3.4G    ./indexes/txindex
3.4G    ./indexes
914M    ./chainstate
280G    .

Is 300GB not enough in 2020 to run a full node? I thought it'd do. But, asking for any helpful tips because I cannot see anything else amiss from debug.log.

  • My full node with a txindex is currently sitting at about 280GB - how much of your disk is usable space? Try df -h - a portion of the physical disk size will be lost to filesystem overhead Commented Jan 20, 2020 at 12:05
  • @RaghavSood Thank you. Yeah I piled on another 100GB and am running that reindexing again. In a few hours I will know. If it completes I'll note that with another confirming comment so anyone stumbling in will have at least that to go on. Commented Jan 20, 2020 at 13:23
  • What OS are you using? There is currently an issue with macOS where some files are larger than they should be and sometimes those files have incorrectly reported sizes.
    – Ava Chow
    Commented Jan 20, 2020 at 17:23

1 Answer 1


It refers to actual disk space. RAM is memory, not storage. The term "disk space" is very specific.

Then a while later this:

[2020-01-20T09:05:59Z Reindexing finished]

But bitcoind continued grinding on... Well then what is all this? ::

Your node was not fully synced, so after it finished reindexing the blocks on disk, it continued to download blocks from its peers and finish syncing.

  • It is a CentOS. It must've been disk space issue, the process is taking a few hours, but it is over 40% this time whereas it always fell over between 11 and 19% before. Cheers. Commented Jan 20, 2020 at 21:03

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