Skip to main content
NetApp Knowledge Base

Do NVMe and SAS SSDs in the same aggregate have a performance impact?

  1. Last updated
  2. Save as PDF
Views:
1,123
Visibility:
Public
Votes:
1
Category:
disk-drives
Specialty:
hw
Last Updated:

Applies to

  • AFF A900, ASA A900
  • AFF A800, ASA A800
  • AFF A400, ASA A400
  • AFF A250, ASA A250
  • NVMe SSD
  • SAS SSD

Answer

  • Yes.
  • For best uniform latency, provision NVMe and SAS SSDs in separate data aggregates
    • Data on migrated SAS SSD shelves will already be in separate aggregates
    • The latency will be still very fast so most applications except the most latency sensitive will notice.
      • Example:
        • NVMe SSDs might respond at 10 microseconds and SAS SSDs might respond at 50 microseconds.
        • This is hypothetical but in this case the repsonse time is 5x worse, but 50 microseconds is excellent response time in over 90% of use cases.
  • If growing capacity on an AFF system, mixing internal and external SSDs in the same aggregate is supported
    • In ONTAP, NVMe SSD and SAS SSD drives are both in the "solid-state" disk class - latency in this disk class is roughly equivalent
  • Imported SAS SSD data aggregates can be expanded by adding RAID groups of NVMe SSDs or partitions
    • ONTAP also allows mixing SAS SSDs and NVMe SSDs in the same RAID group

 

Additional Information

 

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.