[Bug 1564917] Re: Default task limit from systemd is too low for ceph

[Dr. Jens Rosenboom]

I just found out that the limit is not applied after a reboot, it
appears that this only happens when the service is (re-)started manually
from the shell.

-- 
You received this bug notification because you are a member of Ubuntu
OpenStack, which is subscribed to ceph in Ubuntu.
https://bugs.launchpad.net/bugs/1564917

Title:
  Default task limit from systemd is too low for ceph

Status in ceph package in Ubuntu:
  New

Bug description:
  When started via systemd, there is a default limit of 512 Tasks, and
  it seems that each thread counts as a different task:

  # systemctl status ceph-osd at 2                                                                                                                                                                                                                               
  * ceph-osd at 2.service - Ceph object storage daemon
     Loaded: loaded (/lib/systemd/system/ceph-osd at .service; enabled; vendor preset: enabled)
     Active: active (running) since Fri 2016-04-01 13:23:58 UTC; 12s ago
    Process: 31618 ExecStartPre=/usr/lib/ceph/ceph-osd-prestart.sh --cluster ${CLUSTER} --id 2 --setuser ceph --setgroup ceph (code=exited, status=0/SUCCESS)
   Main PID: 31667 (ceph-osd)
      Tasks: 150 (limit: 512)
     CGroup: /system.slice/system-ceph\x2dosd.slice/ceph-osd at 2.service
             `-31667 /usr/bin/ceph-osd -f --cluster ceph --id 2 --setuser ceph --setgroup ceph

  With larger clusters, ceph-osd may need more threads, so this limit
  should be raised in the service definition.

  This may also affect ceph-mon or ceph-mds.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/ceph/+bug/1564917/+subscriptions