Mongodb正在耗尽空间 - 如何增加空间？

Question

我的mongo已停止运行：

$ sudo systemctl status mongodb.service
● mongodb.service - High-performance, schema-free document-oriented database
   Loaded: loaded (/usr/lib/systemd/system/mongodb.service; disabled; vendor preset: disabled)
   Active: failed (Result: exit-code) since Fri 2018-01-05 02:26:08 GMT; 8min ago
  Process: 27887 ExecStart=/usr/bin/mongod --quiet --config /etc/mongodb.conf (code=exited, status=1/FAILURE)
 Main PID: 27887 (code=exited, status=1/FAILURE)

Jan 05 02:26:08 localhost systemd[1]: Started High-performance, schema-free document-oriented database.
Jan 05 02:26:08 localhost systemd[1]: mongodb.service: Main process exited, code=exited, status=1/FAILURE
Jan 05 02:26:08 localhost systemd[1]: mongodb.service: Unit entered failed state.
Jan 05 02:26:08 localhost systemd[1]: mongodb.service: Failed with result 'exit-code'.

我想可能它的空间不足了：

$ df -h /var/lib/mongodb/
Filesystem      Size  Used Avail Use% Mounted on
/dev/root        38G   38G     0 100% /

我该如何解决这个问题？我们可以增加它的大小吗？

我在Arch Linux上。