On Fri, 9 Mar 2012, Madhusudhan wrote: > Sage Weil <sage <at> newdream.net> writes: > > > > > On Fri, 9 Mar 2012, Madhusudhan wrote: > > > Hi all, > > > Just wanted to know if ceph cluster is time sensitive. will there > > > be any issue if the date and time differs between client machine > > > and ceph cluster? do their time has to be in sync to work > > > properly? if time differs, will there be any performance issue ? > > > > It is time sensitive. You currently need to have (reasonably well) > > synchronized clocks. At the very minimum, the ceph-mon daemons need to > > run on machines with good time. There are also some oddities that can > > occur if the fs client doesn't match the metadata server... At some point > > we'll take a closer look at what we can do to make that less of a problem, > > but for now things will be a bit wonky. > > > Thank you Sage. > Currenlty all nodes in ceph cluster are having a set of time set on them and > client is having a different time. Below is example > > Date in one of ceph node : > [root@ceph-node-5 ~]# date > Fri Mar 9 08:41:39 PST 2012 > > Date in the client machine : > [root@my_client_10 ~]# date > Fri Mar 9 22:12:02 IST 2012 > > Will this difference cause performance issue ? I can't think how right now, but I may be missing something. It's hard to tell why things are slow without knowing more about the cluster, load, workoad, etc. A good sanity check is to run rados bench from a client node to see the raw write throughput you can get. Something like 'rados -p rbd bench 60 write'. > > > > > Any plans to include exports/quotas in ceph file system ? > > > it will be a beauty if we have above to options, so that the space > > > in ceph cluster can be effectively allocated to client system. > > > > I'm not sure what you mean by exports, but quotas will be added > > eventually. Again, it's a ways out. > > > > sage > > > > when i said exports, i mean to say about unix exports, where i can > export individual directories/sub-directories to different hosts in > different subnets. > > As a NAS admin, i make use exports a lot. Some time we have to export > a directory to certain subnet and some time to a different subnet. Oh. Yeah, that's also on the roadmap, although again all the fs stuff is a ways out. sage > > > -- > > To unsubscribe from this list: send the line "unsubscribe ceph-devel" in > > the body of a message to majordomo <at> vger.kernel.org > > More majordomo info at http://vger.kernel.org/majordomo-info.html > > > > > > > > > > -- > To unsubscribe from this list: send the line "unsubscribe ceph-devel" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > > -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
