I'm looking at trialling OSD's with a small flashcache device over them to hopefully reduce the impact of metadata updates when doing small block io. Inspiration from here:- http://comments.gmane.org/gmane.comp.file-systems.ceph.devel/12083 One thing I suspect will happen, is that when the OSD node starts up udev could possibly mount the base OSD partition instead of flashcached device, as the base disk will have the ceph partition uuid type. This could result in quite nasty corruption. I have had a look at the Ceph udev rules and can see that something similar has been done for encrypted OSD's. Am I correct in assuming that what I need to do is to create a new partition uuid type for flashcached OSD's and then create a udev rule to activate these new uuid'd OSD's once flashcache has finished assembling them? Many Thanks, Nick _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
 |