How to turn on and turn off Linux disk quota using quotaon and quotaoff commands

To turn Linux disk quotas on for an already mounted filesystem, the quotaon utility can be used. A root, use the following to enable user and group quotas:

quotaon -vug <devicename>

[root@RHEL03 ~]# quotaon -vug /dev/sdb1
/dev/sdb1 [/home]: group quotas turned on
/dev/sdb1 [/home]: user quotas turned on

To temporarily turn off Linux disk quotas, execute the following command as root:

quotaoff -vug <devicename>

[root@RHEL03 ~]# quotaoff -vug /dev/sdb1
/dev/sdb1 [/home]: group quotas turned off
/dev/sdb1 [/home]: user quotas turned off