[OpenAFS] read-write replication in other fs's

[Paul Blackburn]

If we think about it, we can see that a distributed file system that has 
RW replication
has tremendous problems of keeping RW data in synchronisation
across multiple clients and multiple servers over WAN.

Perhaps it is as unreachable as the Holy Grail
and maybe not worth the effort to find it?

Back in the real world, we "spread the risk" by using  multiple
fileservers and spreading data across them evenly. The theory being
that if you have N servers and one fails then the impact affects
one in N people. So, we make make N as big as we can afford.

The other side-effect of using multiple fileservers (and spreading RW
data evenly) is that processing load is distributed and performance 
improved.
--
cheers
paul                              http://acm.org/~mpb


"*twwwwack*  Dunngg!
 Message for you Sir!"       --Monty Python and the Holy Grail


Nathan Neulinger wrote:

>Obviously AFS doesn't have read write replication... I know coda and
>intermezzo do something, but theyy are so alpha as to be pointless in a
>production context.
>
>Someone recently suggested (at a training session) that microsoft's DFS
>has fully redundant RW replication. Can anyone here corroborate or
>refute that? More importantly - if it does, is the situation something
>like:
>
>	"Sure, it has RW replication in the same way that exchange has
>active-active clustering. You're insane to use it cause it causes more
>problems than it helps."
>
>
>-- Nathan
>
>------------------------------------------------------------
>Nathan Neulinger                       EMail:  nneul@umr.edu
>University of Missouri - Rolla         Phone: (573) 341-4841
>Computing Services                       Fax: (573) 341-4216
>
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