[OpenAFS] Holy Grail of High Availability

[Derek Atkins]

Charles Clancy <security@xauth.net> writes:

> There is a single RW volume, and its RO replicas are updated, usually by
> the person who just made changes to the RW volume, with the "vos release"
> command.
> 
> > So all the write changes still have to take place to one server.
> 
> The writes are made to the RW volume, and that volume can live on any of
> the servers.
> 
> > If that server goes down, will write changes go to a server that is
> > still up and running.
> 
> If that server goes down, you won't be able to write.  It may take 30
> seconds, or so (these values can be changed at compile time), for clients
> using the now down server to switch to one of the replicas.

Just to make it clear, if the server with the RW volume goes down,
that's all she wrote.  The other servers will NOT take over the RW
responsibility.  OTOH, if a RO site goes down, clients will switch
over to another replication site.

-derek

-- 
       Derek Atkins, SB '93 MIT EE, SM '95 MIT Media Laboratory
       Member, MIT Student Information Processing Board  (SIPB)
       URL: http://web.mit.edu/warlord/    PP-ASEL-IA     N1NWH
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