Fabio Rueda Carrascosa <avances123@gmail.com> writes: > Hello, I have a 9.1 cluster with 50 databases, only one table per db with > 2000 rows only, but a lot of schema around each one (postgis databases)
> The old cluster size is 1GB
> du -chs /var/lib/postgresql/9.1/main/ > 1.1G
> now I run a pg_upgrade to 9.2 with hard link mode,
> Is the expected behaviour? I can't double the space in production.
I don't think anybody actually answered your original question. The above doesn't represent a doubling of disk space, it just shows that "du" only tells you how much file space is linked into the directory tree you ask it about. That is, there's lots of overlap between the first and second du results. If you try "du" passing it both directory trees together, it should give you a number for the total space consumption that's not much more than 1.1G. (Depending on which version of "du" you're using, you may need to give it an additional switch to tell it not to double-count multiply-linked files.)