[OpenAFS] Re: afs vs nfs

[Chaskiel M Grundman]

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--On Wednesday, November 23, 2005 05:04:35 PM -0800 lamont@scriptkiddie.org =

wrote:

> but if you go down this path long enough to its logical end you wind up
> not liking the /afs/<cell> convention very much...

What are the alternatives? Who gets to decide what content gets what=20
globally unique path?

You can have location independence inside a cell because all the admins=20
communicate and (hopefully) coordinate their activities. You can do this to =

a limited extent among a number of cooperating cells by defining a "virtual =

cell" in root.afs that symlinks to appropriate places depending on the=20
client's home cell. (example: carnegie mellon operates a branch campus in=20
Qatar's Education City. In both the main campus cell and the sattelite=20
cell, /afs/ThisCell/data-campus points at an appropriate set of volumes=20
containing configuration data for clients at that location.=20
/afs/ThisCell/@sys contains the workstation/server environment.  This=20
doesn't work so well for home directories though, since they can't usefully =

be in more than one location at a a time. )

You can't do it between non-cooperating cells because the resulting=20
namespace would end up not being consistent from client to client. So much=20
for a global filesystem. (properly, the cmu virtual cell should be named=20
common-namespace.cmu.edu or some such and not ThisCell, but I wasn't=20
thinking about that aspect of the situation when I came up with the name.)
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