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Hi Steve,

There limit of the image size you can upload depends on the storage backend you use. By default, Glance uses the filesystem backend. This backend is limited by the underlying filesystem and disk size. The SWIFT backend does not have such limitations and can support massive sizes in the tens of gigabytes.

The Glance client uses chunked transfer encoding, sending chunks of the image at a time to the Glance server, which then sends that chunk along to the storage backend.

I do not have any comparison of HTTP vs. SFTP. Sorry :(

-jay