Hi, On one of our OSD nodes I performed a "yum update" with Ceph repositories disabled. So only the OS packages were being updated. During and namely at the end of the yum update, the cluster started to have slow/blocked requests and all VM's with Ceph storage backend had high I/O load. After ~15 minutes the cluster health was OK. The load on the OSD was not high, plenty of available memory + CPU. 1. How is it possible that an yum update on 1 node causes slow requests? 2. What is the best way to remove an OSD node from the cluster during maintenance? ceph osd set noout is not the way to go, since no OSD's are out during yum update and the node is still part of the cluster and will handle I/O. I think the best way is the combination of "ceph osd set noout" + stopping the OSD services so the OSD node does not have any traffic anymore. Any thoughts on this? Thanks! Sinan _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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