Answer / swamynaidu kollu

The quota system (available only on ufs and vxfs
filesystems) is built around limits on the two principal
resources of a filesystem:

* inodes
* data blocks

For each of these resources, users can be assigned quotas.
Two limits can be used: hard limit and soft limit. The hard
limit represents an absolute limit on the resource.
Associated with the soft limit is a time limit set by the
administrator. Users can exceed the soft limits for a
limited amount of time.
In summary, for each user, you can assign quotas (soft and
hard limits) for both blocks and inodes. Also a time limit
can be set indicating how long users can exceed the soft limits.
Remember: only super-user (root) can set disk quota.

*
Create a quotas file
The filesystem is /acct/s1. If quotas is already
there, goto the next step.

# su -
passwd:
# cd /acct/s1
# /usr/bin/touch quotas
# /usr/bin/chmod 600 quotas

*
Set or reset disk quota for users
Assume each student has 100MB (102400KB, we use
100000KB here) disk quota and when he uses 95MB, we need
remind him that he reaches his limit. Also a student cannot
create more than 10000 files (including directoies) and the
soft limit is 9000. So the hard data block limit is 100000,
the soft data block limit is 95000; the hard inode limit is
10000, the soft inode limit is 9000.

1. Set disk quota for a proto-user

Select a proto-user name. For example, csestudent.

# /usr/sbin/edquota csestudent

The editor invoked is vi unless the EDITOR
environment variable specifiles otherwise.

fs /acct/s1 blocks (soft = 0, hard = 0) \
inodes (soft = 0, hard = 0)

Modify it as below:

fs /acct/s1 blocks (soft = 95000, hard = 100000) \
inodes (soft = 9000, hard = 10000)

Save it and quit.

2. Set disk quota for all users

Create the following script to set disk quota
for all users:

# vi .EQ
#!/bin/sh
LOGINS=`/usr/bin/ls | grep -v quotas | grep
-v lost+found \
| grep -v csestudent`
for LOGIN in $LOGINS;
do
/usr/sbin/edquota -p csestudent $LOGIN
done
# /usr/bin/chmod 500 .EQ
# ./.EQ

3. Set soft time limit

The soft time limits are initially set to the
values defined for DQ_FTIMELIMIT and DQ_BTIMELIMIT in
/usr/include/sys/fs/ufs_quota.h. The default value is
7*24*60*60 -- 1 week. It is fine for general use, otherwise
enter:

# /usr/sbin/edquota -t

*
Turn quotas on

# vi /etc/init.d/quotaon
#!/bin/sh
/usr/sbin/quotacheck /acct/s1
/usr/sbin/quotaon /acct/s1
# /usr/bin/chmod 500 /etc/init.d/quotaon
# vi /etc/rc2.d/S99quota
#!/bin/sh
if [ -x /etc/init.d/quotaon ]; then
echo 'Starting quota...'
/etc/init.d/quotaon &
fi
# /usr/bin/chmod 500 /etc/rc2.d/S99quota
# /etc/rc2.d/S99quota

*
Give warning to users
Because no warning is given when the user has exceeded
the soft limit, so add the following to /etc/cshrc:

#
# check disk quota when users login
#
set groupline=`/usr/bin/groups`
if ($groupline[1] == student || $groupline[1] ==
students) then
/usr/sbin/quota -v
endif
unset groupline

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