Postgers 9.3 - ubuntu 16.04 - Are clogs entires automaticallydeleted?

Hi List,

Today I wanted to dump a database but pg_dump is complaining about missing clog files.
I’m quite sure that nobody has deleted the files and that my filesystem is consistent.

If I look in my clog directory I can see the files starting from 0013. The first ones are missing. I have checked the
backupsof a month ago and there I can see previous clog files, 0010,0011. I don’t have older backups.
 

So…. Is there a bug that delete clogs files even when they are still in use?

Cristiano