2012/10/30 Gregory Farnum <greg@xxxxxxxxxxx>: > 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? So, a ceph cluster is made from multiple OSDs. these OSDs are combined by RADOS that is an object store that will stripe over multiple OSDs This store can be accessed by RGW (for S3 and Swift api compatibility, in needed) or directly by a server as a block device with librbd This should be the architecture: OSD -> RADOS -> RGW/LibRBD -> Customer/Server Nothing prevents me to offer a service directly based on RADOS API, if S3 compatibility is not needed, right ? What I don't understand is how can I access a single file from RGW. If LibRBD and RGW are 'gateway' to a RADOS store, i'll have access to a block device, not to a single file. Should I create a filesystem on the block device before using that with RGW? -- 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
