[OpenAFS] Shutdown/startup of entire cell

[Garance A Drosihn]

Hi.

Due to circumstances way beyond my control (a major network
upgrade), I am going to need to shutdown our entire AFS cell
this Saturday.  So, tha is less than 36 hours from now.

Basically all our fileservers use disks which are connected
via iSCSI, and the network upgrade may sever all network
connectivity between the AFS fileservers and their vice*
partitions for at least one hour, and possibly two.  Thus I
expect it would be wise to shutdown all fileservers.

And if I'm shutting down all our fileservers, I assume I
should also shut down all database servers.  (True?)

The one nice thing is that I can do a controlled shutdown, in
whatever order seems appropriate.  So I have two questions:

1) When shutting down, should all database servers be shutdown
    before the fileservers, or should the fileservers be shutdown
    first?

2) When starting up, should the fileservers be started first,
    or should the database servers be started first?

I realize this will disrupt many of our AFS clients.  We're
pretty much expecting we will reboot all of our systems by the
time we're done with this.  It's safe to assume that I'm not
happy about any of this, but I have no choice in the matter.

Apologies for running to the list on this.  I expect the answer
is somewhere in the documentation (or maybe even intuitively
obvious), but this issue didn't come up until early this morning,
and I've got about a dozen other (non-AFS) servers which are also
effected by this network upgrade, so I'd like some confirmation
of best practices for this case.

-- 
Garance Alistair Drosehn                =     drosih@rpi.edu
Senior Systems Programmer               or   gad@FreeBSD.org
Rensselaer Polytechnic Institute;             Troy, NY;  USA