To the experts of "disk quota"

My Red Hat Linux system has already quota enabled
(when it boots, it says "turning on quota for root filesystem")
->I did set my partition /dev/hdb2 to be mounted on /home
->I did Edit /etc/fstab with:
/dev/hdb2   /home ext2  defaults,grpquota  1 1
->I created " quota.group " and gave it rw permissions for root.
->I have several users that are member of the group " users"
and want to assign disk quota limitation (group " users" exist in
/etc/group). So I did " edquota -g users ":
quota for group users
/dev/hdb2: blocks in use 2500000, limits (soft = 1500000, hard = 2000000)
	inodes in use: 0, limits (soft = 0, hard = 0)
-> Then I did run " quotaon -a"
But the limit quota still does not apply to my group (when I type "quota -g 
users",
I get " Disk quota for group users (gid 100): none).
Same problem, even after I rebooted my system.
Everything done through these steps were done as user root.
RedHat Linux version 4.2
Kernel 2.0.30
Diskquota version dquot_5.6.0

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