The Geek Diary

Solaris 11 : Setting user and group quota for ZFS datasets

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As a part of new features in Solaris 11, you can set a limit on the amount of space consumed by a specific group. The command to set quota on specific group is :

# zfs set groupquota@[group]=[size] [dataset]
Note : The groupquota value only applies to the owning group of a file as reflected in the uid/gid outputs of ls -l command. Thus, a secondary group cannot be specified when setting groupquota.

Similarly, users quota can be managed through the use of the userquota property. The command to do so is :

# zfs set userquota@[user] [dataset]

The default value for the default user and group quotas will be the value none which means no default quota is being used. Only when a real value is assigned will the default quota values be used.

Examples:

Let us consider few examples to understand different ways to set user/group quotas on ZFS datasets. As shown in example below a default quota of 2GB is set on FS sandbox/fs4.

# zfs set defaultuserquota=2G sandbox/fs4
# mkfile 100m /sandbox/fs4/file.1
# chown marks:staff /sandbox/file.1

You can verify the default quota set on dataset using :

# zfs userspace sandbox/fs4
TYPE        NAME   USED  QUOTA  SOURCE  
POSIX User  marks  100M     2G  default 
POSIX User  root     3K     2G  default

Example 1
Now give marks an explicit 50G quota which overrides the default quota.

# zfs userquota@marks=50G sandbox/fs4

Verify the changed value of user quota.

# zfs userspace sandbox/fs4
TYPE        NAME   USED  QUOTA  SOURCE  
POSIX User  marks  100M    50G  local 
POSIX User  root     3K     2G  default

To return a user to the default setting:

# zfs userquota@marks=default sandbox/fs4
# zfs userspace sandbox/fs4
TYPE        NAME   USED  QUOTA  SOURCE
POSIX User  marks  100M     2G  default
POSIX User  root     3K     2G  default

If it is desired to have no quota then you can still use the already existing semantic of setting a quota to none.

# zfs userquota@marks=none sandbox/fs4
# zfs userspace sandbox/fs4
TYPE        NAME   USED  QUOTA  SOURCE   
POSIX User  marks  100M   none  local  
POSIX User  root     3K   2G    default

Quota values can also be retrieved via the zfs get sub-command

# zfs get userquota@marks sandbox/fs4
NAME         PROPERTY         VALUE  SOURCE
sandbox/fs4  userquota@marks  none   local

Note how user timh picks up a default quota on the same dataset

# zfs get userquota@timh sandbox/fs4
NAME         PROPERTY        VALUE  SOURCE
sandbox/fs4  userquota@timh  2G     default

Example 2
The default group quotas work the same as default user quotas. The only difference is that you use:

# zfs set groupquota@[group]=[size] [dataset]

For example :
To set a quota of 50G for the group staff :

# zfs groupquota@staff=50G sandbox/fs4

Verify the changed value of user quota.

# zfs groupspace sandbox/fs4
TYPE        NAME   USED  QUOTA  SOURCE  
POSIX Group  staff  100M    50G  local 
POSIX Group  root     3K     2G  default

Few other commands which can be used in similar way as userquota are :

# zfs groupquota@staff=none sandbox/fs4     ### to remove group quota
# zfs get groupquota@staff sandbox/fs4     ### to get group quota details

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