The directory now contains 16.3Gb of stuff
in 146 items.
No it doesn't, the block files are hardlinked.
Thanks, you're right
uids-macbook-pro-2:Bitcoin uid$ ls -li blk* blocks/blk*
414582 -rw------- 2 uid staff 2097361271 Jul 11 2012 blk0001.dat
414585 -rw------- 2 uid staff 2097178774 Dec 6 10:28 blk0002.dat
1894633 -rw------- 2 uid staff 2097168427 Mar 11 08:55 blk0003.dat
6274757 -rw------- 2 uid staff 261849998 Mar 20 19:28 blk0004.dat
1894636 -rw------- 1 uid staff 2067894272 Mar 20 19:28 blkindex.dat
414582 -rw------- 2 uid staff 2097361271 Jul 11 2012 blocks/blk00000.dat
414585 -rw------- 2 uid staff 2097178774 Dec 6 10:28 blocks/blk00001.dat
1894633 -rw------- 2 uid staff 2097168427 Mar 11 08:55 blocks/blk00002.dat
6274757 -rw------- 2 uid staff 261849998 Mar 20 19:28 blocks/blk00003.dat
8335820 -rw------- 1 uid staff 33554432 Mar 21 10:19 blocks/blk00004.dat
First column is inode number, same inode number means same data on disk.
Third column is link count, higher than 1 means there is more than one directory entry for the entry.
So actual data usage on disk in Megabyte for ../Bitcoin directory is:
uids-macbook-pro-2:Bitcoin uid$ du -m .
32 ./blocks/index
859 ./blocks
182 ./chainstate
30 ./database
9296 .
I am still puzzled about the database engine change, how come the data files are still the same.
Perhaps those blk files are not the database files ? -> they are, but the format stayed the same.
Perhaps only the index file changed format from BDB to LevelDB? -> yes, that's correct
I deducted the answer myself from
https://en.bitcoin.it/wiki/Data_directoryFor now I will not change anything.
In the future I might move the BDB files to offline storage (while bitcoin-qt is not active) and start bitcoin-qt again to check all is still ok.
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