[OpenAFS] Unexpected behavior when renaming volumes

[Jeffrey Altman]

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Bastian wrote:
> Hello All,
> 
> I have a strange observation. If I rename a volume and I create another
> volume using the old name, the two volumes have the same contents.
> 
> Changes to one volume are reflected in both volumes immediately. Though
> the volumes do not have the same ID, it looks like they are one and the
> same. I repeated the action several times with the same effect. Deleting
> and recreating both volumes solved the problem.
> 
> Is this the intended behavior or is there something wrong?
> 
> Bastian
> 
> (More information: I am using OpenAFS 1.4.3 on Debian 4.0; all the vldb
> servers and all the servers with copies of the volumes are up. After
> each action I release the volumes)

Clients find a volume by evaluating a mount point containing the volume
name, looking up that name in the vldb to get its ID number, and then
making all further references to it by number.  If you rename the volume
clients that have already mapped the old name to the number will
continue to access the same volume.

When you create the new name and force the client to evaluate that name,
it will receive the same volume ID it saw before.  Hence, both the old
and new names will refer to the same volume on that client until the
cache is flushed and the mount points are forced to be re-evaluated.

In other words, renaming a volume does not cause the cache contents of
the clients to be flushed automatically.

Jeffrey Altman
Secure Endpoints Inc.

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