On Tue, Oct 30, 2012 at 2:36 PM, Gandalf Corvotempesta <gandalf.corvotempesta@xxxxxxxxx> wrote: > 2012/10/30 Gregory Farnum <greg@xxxxxxxxxxx>: >> Not a lot of people are publicly discussing their sizes on things like >> that, unfortunately. I believe DreamHost is still the most open. They >> have an (RGW-based) object storage service which is backed by ~800 >> OSDs and are currently beta-testing a compute service using RBD, which >> you can see described here: >> http://www.youtube.com/watch?v=l_8Y988fO44&feature=plcp > > I'm watching right now. Seems interesting. > Please let me know if I understand ceph properly: > RADOS is the block storage. > RADOS can be accessed through RGW (a REST Gateway) or throgh librbd Not exactly. RADOS is natively a (powerful) object store. RGW takes S3 and Swift REST requests and translates them into RADOS requests, stored in a "custom" format. RBD is a client-side library which takes a logical block device and stripes it over RADOS objects (by default, the first 4MB is one object, the second 4MB are another object, etc). Make sense? -Greg > In the first case, we will have an object store, in the second case, > we will have a block device connected directly to a server (like an > iSCSI block device) > > But in the first case, should I create a filesystem on RBD and then > manage that FS with gateway? -- 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
