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AFS Project Space Administration - New Project Quota Structure
Rainer Többicke
, IT / Data Services
Abstract
afs_admin is used to manage AFS disk space.
With the new 'afs_admin' command introduced last
summer a revised structure has been put in place allowing for
refined control of AFS project space allocation.
'afs_admin' is the tool used by AFS project space
administrators to manage experiment/project disk space, as well as
scratch/work space given out to individual users from the
experiments quota.
Formerly, only two distinct categories of AFS project space
("backed-up" and "non-backed-up") were available. They were
controlled by a single "project quota" for the experiment/project
limiting the aggregate quota of AFS volumes in the project. AFS
volumes in the "backed-up" category would typically start with
'p.projectname...' and in the "non-backed-up" category
with 'q.projectname...'.
In the new structure:
- Quota for each category can (would normally) be specified
individually.
- A new category "user-scratch" has been added: meant as scratch
work space for individual users, usually implemented on cheap
disks. In case the disks or the servers holding them fail, the data
may be lost, as there are no backups. This space is therefore
unsuitable for data which cannot be re-created or recovered by
other means. Scratch volumes are created using the
'afs_admin
create_scratch' command. Volumes in this category start with
's.projectname...', and will have a directory name of
~userid/scratchN, N=0,1,2,...
- The previous categories remain as before:
'q.projectname...' volumes are for data which will not be
backed up and should therefore be re-creatable by other means,
'p.projectname...' and
'u.projectname.userid.X' volumes (accessible under
~userid/wN, N=0,1,2,...) are backed-up daily to tape, back-ups are
kept for about a year at increasingly spaced intervals. Data in
these two categories are placed on highly reliable servers and
disks.
The 'afs_admin list_project' and 'afs_admin
list_quota' now list the project's AFS volumes or its
"project quota" under the different categories separately -
provided distinct values have been assigned - with headings
'projectname_q' or 'projectname_s', or even
'projectname_p'. Additionally, it is now possible to
restrict the output of 'afs_admin list_project' to
volumes of a certain category by appending a '_p',
'_q' or '_s' to the project name, e.g.
'afs_admin list_project atlas_q'.
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