OpenAFS is not part of the Arch core distribution, so you will want to fetch it from the AUR http://aur.archlinux.org/packages.php?ID=3359. Get the Tarball.
Now we'll unpack the package, and tell it to download and compile OpenAFS.
$ tar zxvf openafs.tar.gz
$ cd openafs
$ makepkg -s
After a considerable amount of time you will have a newly built openafs-*.tar.xz in the current directory.
Now install the package you got.
$ sudo pacman -U openafs-*.tar.xz
After the installation finished open up /etc/krb5.conf. Under the category libdefaults set default_realm to HCOOP.NET. Now login with your Hcoop username and password.
$ kinit USERNAME@hcoop.net
< give password >
$ klist
Ticket cache: FILE:/tmp/krb5cc_1000
Default principal: USERNAME@HCOOP.NET
Valid starting Expires Service principal
07/11/11 13:23:59 07/11/11 23:23:59 krbtgt/HCOOP.NET@HCOOP.NET
renew until 07/12/11 13:24:38
The klist commands shows you, that your login at the Hcoop Kerberos server was successful. You obtained a ticket granting ticket (krbtgt).
Now configure and startup openafs. Go to /etc/openafs/ThisCell and change it to hcoop.net.
# start OpenAFS
$ sudo rc.d openafs start
# get AFS tokens
$ aklog
# verify this worked
$ klist
Ticket cache: FILE:/tmp/krb5cc_1000
Default principal: USERNAME@HCOOP.NET
Valid starting Expires Service principal
07/11/11 13:23:59 07/11/11 23:23:59 krbtgt/HCOOP.NET@HCOOP.NET
renew until 07/12/11 13:24:38
07/11/11 13:24:05 07/11/11 23:23:59 afs/hcoop.net@HCOOP.NET
renew until 07/12/11 13:24:38
Do an ls -l /afs/hcoop.net/ to verify that your good to go. If you want the OpenAFS daemon to start automatically on each reboot, add openafs to the DAEMONS line in /etc/rc.conf.
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