> Op 17 februari 2017 om 17:44 schreef Kostis Fardelas <[email protected]>: > > > Hi, > I keep reading recommendations about disabling debug logging in Ceph > in order to improve performance. There are two things that are unclear > to me though: > > a. what do we lose if we decrease default debug logging and where is > the sweet point in order to not lose critical messages? >
Having logs enabled consumes CPU power, mainly on the OSDs. It introduces latency, so when people disable logging they do this to lower latency. I usually disable logs on the OSDs and leave them on on the MONs. Enable them on the OSDs when needed. [osd] debug_osd = 0 debug_filestore = 0 debug_journal = 0 debug_ms = 0 Wido > I would say for example that we would lose OSD traces after a random > OSD crash if we set debug level of osd subsystem to zero (log and > memory). Or a "Errno 24: Too many open files" on mon logs if we set > debug level of mon subsystem to zero. > > b. is there a recommended set of debug settings to mute in client > nodes versus the Ceph daemons nodes? I mean are there settings that > you would mute in client nodes, but prefer to keep them on default > levels on Ceph nodes? > > Best regards, > Kostis > _______________________________________________ > ceph-users mailing list > [email protected] > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com _______________________________________________ ceph-users mailing list [email protected] http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
