- ONTAP 9
- Data ONTAP 8
- Data ONTAP 8 7-Mode
- Data ONTAP 7 and earlier
What does volume autosize do?
- Volume autosize is a policy-based space-management feature in Data ONTAP that allows the volume to grow by an increment if the volume is nearly full.
- The nearly full threshold is defined by the flag
- When a write is sent to the node that is larger than available space, Data ONTAP will try to write as much as possible before failing the write with a
- During the next check, the volume will grow by increments until it has reached the minimum free space threshold.
- This means that autosize is best described as 'grow on use,' rather than 'grow on demand,' a distinction that should be remembered when planning thresholds and grow increments.
- Note that volume autosize does not infinitely grow the volume.
- The volume will grow until it reaches the maximum autosize value and then no more space will be allocated.
The syntax for enabling volume autosize is as follows:
Clustered Data ONTAP/ONTAP 9:
::> volume modify -vserver <vserver_name> -volume <volume_name> -autosize
Note: Starting in ONTAP 9,
-autosize-increment is unavailable, as this value is dynamically determined by ONTAP.
For more details on above parameters check the below link:
Data ONTAP 7:
> vol autosize [-m [k|m|g|t]]
[ on | off | reset ]
-m option sets the maximum size a volume is permitted to grow. Default setting is 120% of volume size at the time of creation
-i option defines the increment by which a volume is grown every time the volume is full. Default setting is 5% of volume size at the time of creation
on enables the feature
off disables the feature
reset resets the settings to default value.
Choosing reclaim policies:
In order to reclaim space which is determined by defining policies, with the use of the
try_first volume option. The
try_first volume option determines whether:
- Snapshot autodelete would be attempted first.
- Or volume autosize would be attempted first.
try_first values are: