And that is why I thought to respond. I was hoping for a little more specifics about what that daemon was going to do. Thank's Gregory, I'm really excited for it!
On Wed, Jun 14, 2017 at 11:05 AM Gregory Farnum <[email protected]> wrote: > On Wed, Jun 14, 2017 at 7:52 AM David Turner <[email protected]> > wrote: > >> In the Firefly release of Ceph, all OSDs asked the mons every question >> about maps that they had. In the Jewel release, that burden was taken off >> of the Mons and given to the OSDs as often as possible to ask each other. >> This was done because the Mons were found to be a bottleneck for growing a >> cluster very large. I had a cluster on Firefly that the mons couldn't >> handle the load if the cluster grew larger than 1200 OSDs. Now in Luminous >> they are again removing some strain on the Mon daemons to allow clusters to >> continue to grow to a larger scale. Like John mentioned, this new daemon >> is there to remove strain on the Mons. >> >> "It is not mandatory to place mgr daemons on the same nodes as mons, but >> it is almost always sensible." >> >> This quote from John's PR for the ceph documentation shows that this is >> not a change for standard Ceph usage, but for extreme clusters pushing the >> bounds of how large you can grow a cluster. Few times will anyone need to >> get that much more performance from their mons, but it is awesome that they >> have created this new daemon to be able to isolate these tasks when you do >> need it for scale. >> > > While we're mostly starting with tasks around scale, that's definitely not > the only reason for the manager. There's already a prototype web dashboard > that lets you see the state of things integrated into the manager; it's > gathering the "perfcounters" statistics that have previously only been > accessible via a daemon's admin socket; we're adding more complicated kinds > of CRUSH reweighting and balancing via the manager that should help balance > out cluster utilization. All these things would have been much more > difficult in the monitor and will help small clusters as well. :) > -Greg > > >> >> On Wed, Jun 14, 2017 at 10:29 AM John Spray <[email protected]> wrote: >> >>> On Wed, Jun 14, 2017 at 6:47 AM, Manuel Lausch <[email protected]> >>> wrote: >>> > Hi, >>> > >>> > we decided to test a bit the upcoming ceph release (luminous). It seems >>> > that I need to install this ceph-mgr daemon as well. But I don't >>> > understand exactly why I need this service and what I can do with it. >>> > >>> > The ceph Cluster is working well without installing any manager daemon. >>> > However in the ceph status output there is a health error ("no active >>> > mgr") >>> > >>> > My questions: >>> > Can we run the cluster without this additional daemon? If yes, is it >>> > possible to supress this health error? >>> >>> You do need the daemon -- in luminous, it is responsible for >>> populating parts of the health monitoring, especially the status of >>> PGs. >>> >>> > What exactly is the purpose of this service. The documentation >>> oncontains >>> > very rare information about it. >>> >>> You probably already found the existing doc page for mgr: >>> "The Ceph Manager daemon (ceph-mgr) runs alongside monitor daemons, to >>> provide additional monitoring and interfaces to external monitoring >>> and management systems." >>> >>> I've fleshed it out a little bit: >>> https://github.com/ceph/ceph/pull/15690 >>> >>> John >>> >>> > >>> > >>> > Regards >>> > Manuel >>> > >>> > >>> > >>> > >>> > >>> > -- >>> > Manuel Lausch >>> > >>> > Systemadministrator >>> > Cloud Services >>> > >>> > 1&1 Mail & Media Development & Technology GmbH | Brauerstraße 48 | >>> > 76135 Karlsruhe | Germany Phone: +49 721 91374-1847 >>> <+49%20721%20913741847> >>> > E-Mail: [email protected] | Web: www.1und1.de >>> > >>> > Amtsgericht Montabaur, HRB 5452 >>> > >>> > Geschäftsführer: Frank Einhellinger, Thomas Ludwig, Jan Oetjen >>> > >>> > >>> > Member of United Internet >>> > >>> > Diese E-Mail kann vertrauliche und/oder gesetzlich geschützte >>> > Informationen enthalten. 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