On Thu, Mar 19, 2015 at 2:41 PM, Nick Fisk <nick@xxxxxxxxxx> wrote: > 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? I haven't worked with the udev rules in a while, but that sounds like the right way to go. -Greg _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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