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How to detect a saturated SAS port from a performance perspective

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Category:
ontap-9
Specialty:
perf
Last Updated:

Applies to

ONTAP 9

Description

  • This article describes how to check if the SAS ports are being saturated and if extra latency is being introduced by the saturated SAS ports.
  • This is usually needed in a performance troubleshooting when the disk layer has a higher-than-expected latency.
    • Expected disk latency is usually hard to tell, it has to be based on the comparison with the disks in the same aggregate, or disks from other aggregates with a similar workload.
    • The saturated SAS ports would add extra latency to the front-end operations, and it would be manifested as the disk layer latency. 

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