Skip to main content
NetApp Knowledge Base

Can the hidden 10 percent disk space reserved for WAFL be adjusted?

  1. Last updated
    Jul 25, 2024
  2. Save as PDF
Views:
1,409
Visibility:
Public
Votes:
0
Category:
data-ontap-7
Specialty:
CORE
Last Updated:
7/25/2024, 4:26:55 PM

​ ​ ​  

Applies to

ONTAP 9

Answer

  • The "hidden" 10% of disk space reserved for WAFL cannot be adjusted, nor can the root user create files in the hidden space.
  • The file system is more efficient when no more than 90% of the physical capacity it occupies is allocated for storing data and metadata.
    • The major advantage is that with one block in every ten always free, the filer is able to locate free space more efficiently, and also have more flexibility in how data is placed to optimize disk writes.

Additional Information

  • Beginning in ONTAP 9.12.1, the WAFL reserve for aggregates greater than 30TB is reduced to 5% for All Flash FAS (AFF) and the FAS500f platforms. 
  • Beginning in ONTAP 9.14.1, this same reduction applies to aggregates on all FAS platforms, resulting in 5% more usable space in the aggregates.
  • Determine space usage in a volume or aggregate
  • ONTAP Space Usage

 

 

NetApp provides no representations or warranties regarding the accuracy or reliability or serviceability of any information or recommendations provided in this publication or with respect to any results that may be obtained by the use of the information or observance of any recommendations provided herein. The information in this document is distributed AS IS and the use of this information or the implementation of any recommendations or techniques herein is a customer's responsibility and depends on the customer's ability to evaluate and integrate them into the customer's operational environment. This document and the information contained herein may be used solely in connection with the NetApp products discussed in this document.