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@2
* ceph-osd@2.service - Ceph object storage daemon
Loaded: loaded (/lib/systemd/system/ceph-osd@.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@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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