Skip to main content

NetApp_Insight_2020.png 

NetApp Knowledgebase

What can impact snapshot size and cause snapshot spill

Views:
239
Visibility:
Public
Votes:
0
Category:
ontap-9
Specialty:
core
Last Updated:

Applies to

  • Data ONTAP operating in 7-Mode
  • Data ONTAP 8
  • ONTAP 9
  • Snapshots

Answer

The more the active file system changes and the longer Snapshot copies remain, the more space the copies consume. This is due to the fact that WAFL never overwrites a data block. If a file is modified, updated blocks are written to a new location. If data gets deleted from the active file system, old snapshot copies that contain that data will still point to those block, thus, space will not get freed up. Therefore, snapshots can become larger and grow beyond their snap reserve, thus, spilling into AFS (Active File System).

 
If this happens, the user can use one (or a combination) of the following options:
  1. Increase snap reserve
  2. Change the Snapshot retention rate
  3. Configure Snapshot autodelete
  4. Backup Snapshots to DR