Question: What are my storage quotas?
Author: Joseph Tam
Date: Nov. 9, 2010
Storage quotas are enforced on our MathNet systems to ensure a
fair distribution of a shared resource. It also prevents accidental
(runaway programs) or intentional (packratting) usage of all storage
space that deny all other users of disk space.
Typical storage quotas
As of the writing of this document, the typical disk use quotas are
|Personal web directory
Checking your storage quotas
To check on your current quota and disk usage, you can use one of two
Web page: quotas are reported on the
MathNet User Services
site. Log in using your username and password.
Unix command line: to check your quotas and usage, log in to any
of our public Unix servers, and this command:
Output may look like:
Filesystem usage quota limit timeleft files quota limit timeleft
/nfs/mail 41576 512000 512000 0 0 0
/nfs/HomeWeb 0 524288 524288 0 -1 -1
/nfs/jsmith 21844 2097152 2097152 1657 -1 -1
In this particular case, user jsmith is using 41576K
out of a maximum 512000K (=512Mb) of mail inbox quota,
as well as 21844K out of a maximum 2097152K (2Gb) in
their home directory. No space is being used in their
personal web folder.
This information should also be displayed each time
you log into a Unix account.
What to do when you are running out of space
If you find that you are close to exceeding your file quotas, you may
request an increase in quotas from the IT staff, but before you do this,
you ought to trim your use of disk space by
- Getting rid of unwanted or duplicate files.
- Getting rid of files that can be regenerated (e.g. *.dvi, *.ps, etc.
but retain the original *.tex file).
- Getting rid of core dump file (usually named "core" or "core.#" where # is a number).
- Getting rid of cache/backup files generated by various applications.
- .Trash/*: Gnome desktop trash.
- Trash, mail/Trash: Email trash?
- Deleting unwanted mail, spam. The quickest way to
slim down a mailbox is to sort it by size, then go through
the Email in decreasing size and eliminating in that order.
Usually, the majority space is taken up by a few pieces of Email
with large attachments.
- Transfer mail from your inbox to a mail folder.
- Transferring seldomly used or achival data onto some other medium
(CD, DVD), then deleting it from your file storage area.
If you have trouble tracking down disk usage, you can use some of
# Go to your home directory and summarize storage use of all
# files and directory at the top-level. You can then descend
# into the folders using the most space and refine the search.
du -sk .[^.]* * | sort -n
# List 10 largest files over 1024K anywhere within your home directory.
find ~ -type f -size +1024 -printf "%s %p\n" | sort -n | tail -10
# Sort all files in the current directory and sub-directories by size.
find . -type f -printf "%s %p\n" | sort -n | less
Usually, there are a few large directories that account for most of the
storage, so concentrating your effort on reducing storage in these areas
will be the most effective way of reducing storage.