MongoDB "open files limit" error during repairDatabase
<p>I'm trying to do repairDatabase of MongoDB on Ubuntu 16.04 but it fails with an error "errno:24 Too many open files" ("code" : 16818).</p>

<p>I've raised "ulimit -n" up to 1024000, restarted the server, but still getting the same error.
It does not seem possible to raise it higher and I'm stuck with no ideas. Please help!</p>