centos 6.5 - diskquota

install quota
	yum install quota

edit /etc/fstab
	nano /etc/fstab
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/dev/sda1	/home	ext4	defaults,usrjquota=aquota.user,grpjquota=aquota.group,jqfmt=vfsv0	1	2

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remount /home
	mount -o remount /home

run an initial quotacheck command which will analyse all files on the partition and creates the aquota.user and aquota.group files in the /home root.
	quotacheck -avugm

sample output which is Ok.
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quotacheck: Scanning /dev/sda2 [/home] done
quotacheck: Cannot stat old user quota file: No such file or directory
quotacheck: Cannot stat old group quota file: No such file or directory
quotacheck: Cannot stat old user quota file: No such file or directory
quotacheck: Cannot stat old group quota file: No such file or directory
quotacheck: Checked 131 directories and 865 files
quotacheck: Old file not found.
quotacheck: Old file not found.
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Activate the quota
	quotaon -avug

To see which users uses what amount of space (blocks) and files (inodes)
	repquota /home

set user quota
0 – no soft quota for block size
1000000 – 1000 MB hard quota
0 – no soft quota for file amount
0 – no hard quota for file amount

	setquota -u user1 -F vfsv0 0 1000000 0 0 /dev/sda1


edit user quota
	edquota john

edit group quota (press i to enable edit, change the values and press Esc. Then enter :wq! to save the changes)
	edquota -g sambagrp