[OpenAFS] High disponibility of Open afs

[Derrick J Brashear]

On Wed, 21 May 2003, Parasote Laurent wrote:

> Hi
> We are trying open AFS, actually on Linux servers with Raid Disks. We are
> searching for a high disponibility and open source solution for web hosting.
> I don't know how to configure OpenAFS file servers in order to have
> replication on many servers, but in RW, not RO!

OpenAFS doesn't do read-write replication. It's a hard problem, Coda does
it, though it doesn't have all of the niceties that AFS does, it does get
this done.

> I've configured two File servers with the same cell, one with the RW
> partitions and one with the RO. If the link or the hardware of the main
> server fails, the second is also inoperant! Why? Is it possible to get high
> RW disponibility?

If you have only one database server, on the first host, then when it goes
down, the second host can't see any of the databases.

If you have 2 database servers, one on each, you retain ability to read,
but you can't make database updates (you can find out where a volume is,
but you can't update its location if you want to move it)

If this isn't what you mean by failure, you'll have to give a little more
detail.

> (I apologize for my poor technical english...)

As with most technical subjects, context helps us to figure out what you
mean, and hopefully you to figure out our replies, even if there are some
bit errors our language. (Besides, your English is far superior to my
French.)