On Thu, Jul 25, 2019 at 7:48 AM Dan van der Ster <dan@xxxxxxxxxxxxxx> wrote: > > Hi all, > > In September we'll need to power down a CephFS cluster (currently > mimic) for a several-hour electrical intervention. > > Having never done this before, I thought I'd check with the list. > Here's our planned procedure: > > 1. umounts /cephfs from all hpc clients. > 2. ceph osd set noout > 3. wait until there is zero IO on the cluster > 4. stop all mds's (active + standby) You can also use `ceph fs set <name> down true` which will flush all metadata/journals, evict any lingering clients, and leave the file system down until manually brought back up even if there are standby MDSs available. -- Patrick Donnelly, Ph.D. He / Him / His Senior Software Engineer Red Hat Sunnyvale, CA GPG: 19F28A586F808C2402351B93C3301A3E258DD79D _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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