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AFS

Computer Center

AFS

1. Cell Name in DESY Zeuthen
2. AFS Home Directories in DESY Zeuthen
3. AFS Backup/Recover at DESY Zeuthen
4. acrontab
5. Usage of storage locations
6. AFS Usage Hints
7. Documentation to AFS

1. Cell Name in DESY Zeuthen

The DESY Zeuthen cell name is ifh.de

2. AFS Home Directories

All users have an AFS home directory. A user with account name testuser has the following AFS Home Directory: /afs/ifh.de/user/t/testuser/
You can have up to 2 Gigabyte quota. Please contact uco-zn@desy.de for increasing.

To have an AFS home directory has a lot of advantages:


There are some things to know:


An AFS token is needed to access anything in AFS that's not (literally!) world-readable. This AFS token has a lifetime of about 25 hours. You get this during the normal login, using kinit. A screensaver activated your xsession. With klist or tokens you can see the current tickets/tokens.

Hence there are some inconveniences when you want processes of yours to run unattended (cron- or background- jobs):
If they need access to your home directory (which is sometimes hard to avoid), they need a valid AFS token. Facilities like acrontab and the Batch System take care of that.

3. AFS Backup/Recover at DESY Zeuthen

Information about recover of complete volumes and individual files or directories.

4. acrontab

The acrontab command allows scheduling of cron jobs with valid AFS tokens.

5. Usage of storage locations

Purpose
Path
Persistence
Backup Strategy
Visibility
Remarks
valuable user data
/afs/ifh.de/user/
<initial>/<user>
permanent
automatic, daily backup
on all machines
contact: uco-zn@desy.de
group data
/afs/ifh.de/group/
permanent
backup for all AFS volumes names of which start with g., but not gn.
on all machines
contact: your group AFS admin
See: AFS Backup
small data, easy to reproduce
/afs/ifh.de/group/
nearly permanent
no backup
on all machines
contact: your group AFS admin

6. AFS Usage Hints

7. Documentation to AFS

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