[OpenAFS] multiple fileservers

Paul Blackburn mpb@est.ibm.com
Tue, 28 Jan 2003 12:04:46 +0000

Hi Amar,

Yes, that is the whole point of replicating ReadOnly data on
multiple servers: the ReadOnly data is still accessible
when the fileserver housing the ReadWrite volume is offline.

It works here.

Of course it helps if the ReadOnly replica volumes
are regularily kept up-to-date with the ReadWrite copy
using something like: "vos release $volume -verbose".

In addition, if your have fileservers in geographically
distant locations, you can define AFS fileserver preferences
so that your client will select a closer fileserver rather
than a distant fileserver.

You will find a script for computing best fileserver preferences
based on ping times from client to all fileservers in a cell here:

Many AFS cells have all their fileservers in a single location
so "afs_optim" won't help much with those.

AFS volume replication is for ReadOnly data only.

paul                      http://acm.org/~mpb

amar deep kumar wrote:

> hi,
>   on adding additional file server ,if we replicate the read/write
> volume on those fileservers, and if the fileserver that has the
> read/write copy of the volume goes down, will we be able to read the
> volumes from the replicas.whether we can write in the volumes or not.
> i want to have multiple  fileservers on which the read write volumes
> will be replicated, but it seems as if for them to work the fileserver
> having read/write volume should be up.please elaborate this point.
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