[ceph-users] Is ceph-mon disk write i/o normal at more than 1/2TB a day on an empty cluster?

Hi all, I'm in the process of testing out ceph on a small cluster. The cluster is virtually empty with no clients, just a few OSDs. I noticed extensive disk write I/O on some nodes and tracked them down to the ceph-mon daemon. A cursory log over 1 hour shows that each monitor generates about 22GB worth of disk write I/O or more than 1/2TB a day. The log was generated using iotop. It seems the 3 monitors in the cluster are doing the same thing. Is this normal or something I should be taking a closer look at? Cheers, --Tri Hoang