AFS at IPP/RZG

Some information about IPP specific details of the AFS.

Home directories

Every user registered at RZG has a home-volume, which is mounted as her/his home-directory.

There are two places, where your home-volume is mounted :

/afs/ipp-garching.mpg.de/u/<username> or /afs/ipp-garching.mpg.de/home/<first letter of username>/<username>

Working in either of these directories is completely equivalent.

Beside the home-directory, every user has also an archival directory /afs/ipp-garching.mpg.de/m/<username> (somtimes called "M-Baum" or "M-Tree" )

where up to 1 TB of data in up to 1000 files can be stored.

These data are migrated to tape and are subject to be wiped from disc.

Since we do not want millions of small files on tape, a file-quota of 1000 is enforced.

When accessing these data, it might take a while until it the data is available.

Until then the command will hang.

You can check the status of the data with the "fs ls" command.

This command is only available for openafs-clients with the osd - extension as published by RZG.

Other client will misinterpret this command as "fs listmount".

As briefly described in understanding AFS, all Volumes at IPP have a READ-ONLY copy. This RO (read-only) copy of the Volumes

is refreshed ("The RW-Volume is released" in AFS-speak) every day by a cron-job.

The RO of your home-Volume (home-directory) is mounted /afs/ipp-garching.mpg.de/.u/<username>.

Please note the dot before the "u".

This gives you the possibility to browse through a snapshot of your home-directory which is up to 24hours old and recover data

which just got missing.

More information about recovering older files than this is given under Datastorage->TSM in the navigation column on the left.