[OpenAFS] File/data transfer

Jeffrey Altman jaltman@secure-endpoints.com
Tue, 24 Jul 2007 13:37:23 -0400


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Lundgren, Andrew wrote:
> I am working on setting up my first cell and have a few more questions
> about what to expect.
>  
> When a client requests a file that is not stored locally in the cache,
> does the FS pull the full file before allowing access to it, or does it
> pull a requested block?

It retrieves the requested block.  The OAFW cache manager will look at
the CreateFile hints to determine what if any prefetching should be
performed on additional chunks.

> If the file requested is multiple gigs does the call to open block until
> the full file is retrieved from the server?

No.  Only requested chunks and those pre-fetched are retrieved when the
data is actually read.

Jeffrey Altman

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