On Tue, Feb 3, 2015 at 1:17 PM, John Spray <john.spray@xxxxxxxxxx> wrote: > On Tue, Feb 3, 2015 at 2:21 PM, Daniel Schneller > <daniel.schneller@xxxxxxxxxxxxxxxx> wrote: >> Now, say I wanted to put /baremetal into a different pool, how would I go >> about this? >> >> Can I setfattr on the /cephfs mountpoint and assign it a different pool with >> e. g. different replication settings? > > This should make it clearer: > http://ceph.com/docs/master/cephfs/file-layouts/#inheritance-of-layouts > > When you change the layout of a directory, the new layout will only > apply to newly created files: it will not trigger any data movement. > > If you explicitly change the layout of a file containing data to point > to a different pool, then you will see zeros when you try to read it > back (although new data will be written to the new pool). That statement sounds really scary. To reassure people: you can't actually change layout on a file which has already been written to! Trying to do so will return an error code; actually changing the layouts and seeing this result would require manually mucking around with RADOS data underneath the MDS. -Greg _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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