What you model SSD disk? 07 марта 2014 г. 13:50 пользователь "Indra Pramana" <in...@sg.or.id> написал:
> Hi, > > I have a Ceph cluster, currently with 5 osd servers and around 22 OSDs > with SSD drives and I noted that the I/O speed, especially write access to > the cluster is degrading over time. When we first started the cluster, we > can get up to 250-300 MB/s write speed to the SSD cluster but now we can > only get up to half the mark. Furthermore, it now fluctuates so sometimes I > can get slightly better speed but on another time I get very bad result. > > We started with 3 osd servers and 12 OSDs and gradually add more servers. > We are using KVM hypervisors as the Ceph clients and connection between > clients and servers and between the servers are through 10 GBps switch with > jumbo frames enabled on all interfaces. > > Any advice on how can I start to troubleshoot what might have caused the > degradation of the I/O speed? Does utilisation contributes to it (since now > we have more users compared to last time when we started)? Any optimisation > we can do to improve the I/O performance? > > Appreciate any advice, thank you. > > Cheers. > > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > >
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