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What is difference between queue depth and disk queue

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ontap-9
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san
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Applies to

  • ONTAP
  • FCP

Answer

Queue Depth:
  • Queue depth is a storage parameter.
  • Queue depth is the number of I/O requests (SCSI commands) that can be queued at one time on a storage controller.
  • Each I/O request from the host's initiator HBA to the storage controller's target adapter consumes a queue entry.
  • Higher queue depth equates to better performance.
 
Disk Queue:
  • This is a host disk parameter, configured by the host OS.
  • Disk Queue tracks the number of requests that are queued and waiting for a disk during the sample interval.
  • This counter will help in understanding disk performance issues at the host.
  • Disk queue value is OS configuration and recommended by the OS team.

Additional Information

 

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