Skip to main content
NetApp Knowledge Base

Is It Necessary to Set the Volume Compression Group Size to 8K When Using ODX (Offload Data Transfer)?

  1. Last updated
  2. Save as PDF
Views:
129
Visibility:
Public
Votes:
0
Category:
ontap-9
Specialty:
core
Last Updated:

Applies to

  • ONTAP 9
  • ODX (Offload Data Transfer)

Answer

  • As part of ODX requirements, when using a compressed volume, the compression format needs to be adaptive.
  • The supported compression group size is only 8K.
  • In FAS systems, only post-process is permitted, and the application-io-size parameter is set to 'not allowed'. Hence, there will be no background recompression and it will remain as adaptive/8K.
  • For AFF systems, when the application-io-size parameter is set to 'auto', hot data gets compressed inline using 8K compression groups. Cold data is then recompressed in the background using a more aggressive 32K compression group. Therefore, when using ODX in an AFF environment, it is necessary to explicitly set it to 8K, not 'auto'.

Additional Information

additionalInformation_text
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.