Effects of qtree changes on quotas

Effect of deleting a qtree on tree quotas

When you delete a qtree, all quotas that are applicable to that qtree, whether they are explicit or derived, are automatically deleted.

If you create a new qtree with the same name as the one you deleted, the quotas previously applied to the deleted qtree are not applied automatically to the new qtree. If a default tree quota exists, Data ONTAP creates new derived quotas for the new qtree. However, explicit quotas in the /etc/quotas file do not apply until you reinitialize quotas.

Effect of renaming a qtree on tree quotas

When you rename a qtree, Data ONTAP keeps the same ID for the tree. As a result, all quotas applicable to the qtree, whether they are explicit or derived, continue to be applicable.

Effects of changing qtree security style on user quota usages

Because ACLs apply in qtrees using NTFS or mixed security style but not in qtrees using UNIX security style, changing the security style of a qtree through the qtree security command might affect how a UNIX or Windows user's quota usages for that qtree are calculated.

Example

If NTFS security is in effect on qtree A and an ACL gives Windows user Windows/joe ownership of a 5MB file, then user Windows/joe is charged 5 MB of quota usage on qtree A.

If the security style of qtree A is changed to UNIX and Windows user Windows/joe is default mapped to UNIX user joe, the ACL that charged 5 MB of diskspace against the quota of Windows/joe is ignored when calculating the quota usage of UNIX user joe.

Caution
To make sure quota usages for both UNIX and Windows users are properly calculated after you use the qtree security command to change style change, turn quotas for the volume containing that qtree off and then back on again using the quota off volume and quota on volume commands.

If you change the security style from UNIX to either mixed or NTFS, previously hidden ACLs become visible, any ACLs that were ignored become effective again and the NFS user information is ignored. If no ACL existed before, then the NFS information is used in the quota calculation.

Note
Only UNIX group quotas apply to qtrees. Changing the security style of a qtree, therefore, does not affect the quota usages that groups are subject to.