How Quotas display with NFS clients "df " output?

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How Quotas display with NFS clients "df " output?

Applies to

Data ONTAP Quotas

Answer

There are three type of quotas, Tree, User and Group. Data ONTAP does not apply Group quotas for Windows IDs.

These quotas are governed using the quota rules.
A quota rule is always specific to a volume.
Quota rules have no effect until quotas are activated on the volume defined in the quota rule.
A quota policy is a collection of quota rules for all the volumes of an SVM.
Quota policies are not shared among SVMs. An SVM can have up to five quota policies, which enable you to have backup copies of quota policies.
One quota policy is assigned to an SVM at any given time.

Tree quotas, when applied will be reflected in the DF output of the NFS clients and CIFS clients.

Example:

cluster-usa::> version NetApp Release 8.3.2P7: Mon Oct 03 10:59:56 UTC 2016 cluster-usa::> cluster-usa::> vol size nfs vol size: Volume "nfssvm:nfs" has size 50g. cluster-usa::> cluster-usa::> qtree show nfs Vserver    Volume        Qtree        Style        Oplocks   Status ---------- ------------- ------------ ------------ --------- -------- nfssvm     nfs           ""           unix         enable    normal nfssvm     nfs           unix         unix         enable    normal 3 entries were displayed. cluster-usa::> cluster-usa::> quota policy rule show -volume nfs Vserver: nfssvm            Policy: default           Volume: nfs Soft             Soft User         Disk     Disk   Files    Files Type   Target    Qtree   Mapping     Limit    Limit   Limit    Limit Threshold ----- -------- ------- ------- -------- ------- ------ ------- --------- tree   unix      ""      -             1GB        -       -        -          - cluster-usa::>

So we set the tree quota of 1G on a volume of 50G. Now, mount the qtree from the Linux client and check the size:

[root@sj ~]# mount nfssvm:/nfs/unix /mnt [root@sj ~]# [root@sj ~]# df -h /mnt Filesystem            Size Used Avail Use% Mounted on nfssvm:/nfs/unix      1.0G     0 1.0G   0% /mnt [root@sj ~]#

User quotas on the other hand, will be reflected only on CIFS mappings (mapped drive size) but not on NFS clients df output.

Example:

cluster-usa::> vol size vol_user vol size: Volume "nfssvm:vol_user" has size 20g. cluster-usa::> cluster-usa::> quota policy rule show -volume vol_user Vserver: nfssvm            Policy: default           Volume: vol_user Soft             Soft User         Disk     Disk   Files    Files Type   Target    Qtree   Mapping     Limit    Limit   Limit    Limit Threshold ----- -------- ------- ------- -------- ------- ------ ------- --------- user   5839      home    off           1GB        -       -        -          - user   RTP2K8DOM2\jsiva home off   1GB        -       -        -          - 2 entries were displayed. cluster-usa::>

In the above example of 20G volume, a disk quota limit of 1G is set for both Windows user RTP2K8DOM2\jsiva and Unix user ID 5839 for qtree called home.
If the qtree has NTFS security style and if the CIFS user maps the qtree, then the mapped drive will be 1G in size under Windows.

However on UNIX, the NFS mount of the qtree will still show the full size of the volume when a user quota is set.

[root@sj ~]# mount nfssvm:/vol_user/home /home [root@sj ~]# [root@sj ~]# df -h /home Filesystem            Size Used Avail Use% Mounted on nfssvm:/vol_user/home 19G 4.5M   19G   1% /home [root@sj ~]#

As the user 'jsiva (uid 5839) attempts to create data more than 1G allowed quota size, it will fail with the following error:

[root@sj ~]# su - jsiva bash-4.1$ bash-4.1$ df -h . Filesystem            Size Used Avail Use% Mounted on nfssvm:/vol_user/home 19G 4.5M   19G   1% /home bash-4.1$ bash-4.1$ dd if=/dev/zero of=/home/jsiva/myfile bs=10485760 count=120 dd: closing output file `/home/jsiva/myfile': Input/output error bash-4.1$

And rquota must be enabled on the controller side to check the user quota from the NFS client.

cluster-usa::> vserver nfs modify -vserver nfssvm -rquota enabled cluster-usa::> bash-4.1$ quota jsiva Disk quotas for user jsiva (uid 5839): Filesystem blocks   quota   limit   grace   files   quota   limit   grace nfssvm:/vol_user/home 1048532 1048576 1048576               2 4294967295 4294967295 bash-4.1$

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