On Wed, Apr 17, 2013 at 06:23:43PM -0400, Gregory Farnum wrote: > On Wed, Apr 17, 2013 at 3:02 PM, I wrote: > > In particular, has anyone tried making a big RAID set (of any type) and > > carving out space (logical volumes, zvols, etc.) to become virtual OSDs? > > Any architectural gotchas with this idea? > > I believe there are some people running with this architecture; > there's just less knowledge about how it behaves in the long term. It > should be fine subject to the standard issues with RAID5/6 small > writes, which OSDs do a lot of (and I don't know why you'd bother > using a mirroring RAID instead of Ceph replication!). > I can say that there would be little point to carving up the arrays > into multiple OSDs; other than that, have fun. :) > -Greg > Software Engineer #42 @ http://inktank.com | http://ceph.com So you think it'd be worth trying just running a few really large OSDs in a configuration like that? I wasn't sure that would scale as well, but I'm still pretty new to Ceph. About mirroring/RAID vs. Ceph replication, I was under the impression that there would be a lot of extra network traffic generated by writes with so many replicas which might not be optimal. True enough about RAID 5/6 small writes. Just gotta try it and see I guess. Thanks for the feedback! Steve -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
