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AFS (Andrew File System or A File System) is a distributed file system. The top
directory of the AFS hierarchy is the same all over the world, and is /afs.
Every institution in the world with AFS fileservers has its own unique "cell"
subdirectory under /afs. CNF's cell is named "cnf.cornell.edu" and is located at
/afs/cnf.cornell.edu
Within a cell, files are located on fileservers and are grouped within entities
named volumes. Volumes are partition of physical disks (of the data servers), in
which quotas are applied. Backups of data can also be performend on a per-volume
basis. And, data on readonly volumes can be replicated across multiple
fileservers.
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Your token has a limited lifetime, which is 8 hours at CNF. To check your
token's expiration date, do the following:
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When obtaining new tokens, if using a Cornell netid, your username must be
formatted as:
netid@CIT.CORNELL.EDU (@CIT.CORNELL.EDU must be all caps).
If using a Cornell GuestID, your username must be formatted as:
guestid@GUEST.CORNELL.EDU (@GUEST.CORNELL.EDU ) must be all caps).
Access Control Lists
An Access Control List (ACL) is the AFS mechanism which let you access
directories and files. This access mechanism works as follows:
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From a terminal, use fs la directory and fs sa directory acl. For
example:
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$ fs la /afs/cnf.cornell.edu Access list for /afs/cnf.cornell.edu is Normal rights: cnfhosts rl grp_all rl grp_it rlidwka system:administrators rlidwka system:anyuser rl |
If I was in the system:administrators group, I could change the ACLs
on /afs/cnf.cornell.edu to, for example, give system:anyuser write
access:
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$ fs sa /afs/cnf.cornell.edu system:anyuser write |
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Every CNF user has a personal home directory in its own volume under AFS. User
home directories are located at /afs/cnf.cornell.edu/home/users/username .
Initial quota is TBD. Staff home directories are located at
/afs/cnf.cornell.edu/home/staff/ .
On Windows, your W drive is your AFS home directory. And your X drive is the top
level of the CNF AFS cell.
In your home directory are a few pre-defined folders with permissions set
appropriately:
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Located at /afs/cnf.cornell.edu/shares/public/outside_users
Only staff can write to this share.
Files in this share can be read by anyone anywhere in the world.