Thank you Greg, thank you Kenneth, i have enabled ntp now and the clock skew is getting smaller and it’s gone after a while, so everything is fine now. I already thought the virtual Disks could slow down things, now i know it for sure. My last question (for now): Is there any difference between rbd’s and a mounted cephFS concerning of the performance?
Thank you in advance, Florian Am 13.03.2014 um 03:36 schrieb kenneth <kenn...@apolloglobal.net>: > On 3/12/2014 6:24 PM, Florian Krauß wrote: >> Hello everyone, >> >> this is the first time i ever write to a mailing list, please be patient >> with me (especially for my poor english)… >> Im trying to reach my Bachelors Degree in Computer Science, Im doing a >> Project which involves ceph. >> I’am able to setup a ceph Cluster, but there are a few things i can’t Figure >> out… >> >> As I’am setting up the cluster with virtual machines im facing a little >> Problem: >> clock skew: every time i reboot on node a clock skew is detected. If i >> restart the Monitor on which the clock skew is detected the Problem is gone. >> But this is not what i want to show in my presentation. I already enabled >> the VMware tools, but the Problem persists. Does it make more sense to >> enable NTP? > You'll most likely need to setup NTP. I don't know of any better way to sync > clocks so be sure to install NTP on ceph nodes. You should setup a local NTP > server on your lan so that latency is very small >> >> Are there any performance Issues to expect if i use a drive with >> ceph-disk-prepare (or activate) /dev/sdb directly ? >> >> Are there any (big) performance Issues to expect using these virtual drives >> instead of „real“ drives? > Yes, virtual machine hard drives can be slower than hardware drives so > performance may be slower. >> >> Kind regards >> >> Florian >> _______________________________________________ >> ceph-users mailing list >> ceph-users@lists.ceph.com >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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