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

[Dr. Jens Rosenboom]

Public bug reported:

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.

** Affects: ceph (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1564917

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

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