On Wed, 22 Apr 2015 10:11:22 +0200 Götz Reinicke - IT Koordinator wrote: > Hi folks, > > thanks for the feedback regarding the network questions. Currently I try > to solve the question of how much memory, cores and GHz for OSD nodes > and Monitors. > > My research so far: > > OSD nodes: 2 GB RAM, 2 GHz, 1 Core (?) per OSD > RAM is enough, but more helps (page cache on the storage node makes the reads of hot objects quite fast and prevents concurrent access to the disks). 1GHz or so for per pure HDD based OSD, at least 2GHz for HDD OSDs with SSD journals, as much as you can afford for entirely SSD based OSDs. Improvement in the Ceph code may lower these numbers, but for now this seems to be where it's at. > + enough power to handle the network load. > > For the monitors I can't find a real base of information; some are much > stronger (more RAM, more CPU/GHz) some use less performant systems. > MONs need not all that much memory or CPU power, nor do they need all to be dedicated nodes. 16GB and 2-4 cores at 2+GHz should do. Of course that depends on your cluster size and activity, but they really like fast IO, so SSD backed storage for them. Christian > And the http://ceph.com/docs/master/start/hardware-recommendations/ > looks a little bit "outdated" ... e.g. "... A recent (2012) Ceph cluster > project. ..." > > How to calculate a good balanced? Is there a rule of thumb estimate :)? > > BTW: The numbers I got are from the recommendation and sample > configurations from DELL, HP, Intel, Supermicron, Emulex, CERN and some > more... Like this list. > > Thanks a lot for any suggestion and feedback . Regards . Götz > -- Christian Balzer Network/Systems Engineer chibi@xxxxxxx Global OnLine Japan/Fusion Communications http://www.gol.com/ _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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