[OpenAFS] Some questions about AFS

Thomas Kula kula@tproa.net
Fri, 18 Jan 2008 16:08:41 -0500

On Fri, Jan 18, 2008 at 05:14:29PM +0100, Anders Magnusson wrote:

> Ok, thanks.  A related question to this is how database replication 
> works, the databases
> became quite large.  80MB prdb and 40MB vldb.  Will it only copy changed 
> entries or
> may the whole database be copied?

Here at UMich our prdb and vldb are 92 and 46M respectively.
We (in recent memory, though I've only been here a year) pretty
much just don't notice. 

I don't remember off-hand all the details, but the ubik
protocol the database things are built on sends out and
commits individual transactions, so you're not always
shoving around the entire database. How a machine catches
up after it has been off for a while I don't know --- if
it sees it is behind and grabs the whole thing or grabs
only the stuff to bring it up to date or some combination
of which I'm not sure.

Thomas L. Kula | kula@tproa.net | http://kula.tproa.net/
Mathom House at Ypsi-Edge, The People's Republic of Ames