[Xen-devel] Re: AFS-based VBD backend

[johannes@xxxxxxxxxx (Johannes Formann)]

Steve Traugott <stevegt@xxxxxxxxxxxxx> wrote:

Hi,

The idea sounds nice to me, but I've one question

> I think most of this could be done in python -- the backend driver
> itself might be a relatively thin layer to translate block addressing to
> and from file byte locations, talk to the frontend, and do a periodic
> fsync() on the underlying file to write the changes back to the AFS
> server.

Wouldn't OpenAFS send the complete file to the server when the fsync()
is called and creates lots of network traffik?

And wouldn't be the file/backend locked until the fsync() is done, which
could take some time if you'll have a few GB.

regards Johannes

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