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How to collect WAFLTOP output from CLI

Last Updated:

Applies to

  • Data ONTAP 8 7-Mode 
  • ONTAP 9


  • wafltop is used to collect low-level WAFL performance data on a per-volume basis.
  • It may be used if using 7-mode (in place of qos statistics) or if qos statistics cannot help identify CPU or disk utilization latency sources.
  • It tracks utilization of the following resources:
    • CPU
    • Disk I/O
    • Memory
    • NVLOG utilization
  • The format of the volume name will be: aggregate:volume:protocol:message in the output
Output Meaning
aggregate The name of the Aggregate the Volume resides in
<aggregate>:volume The FlexVol being worked on

Frontend CIFS, FCP, iSCSI, or NFS, or backend protocols like spinvfs, dense, walloc, zombie, or other

Write allocator

Deduplication or storage efficiency

File deletions

A catchall for any other internal operations, such as WAFL scanners

Refers to ONTAP 9 protocol workloads, or user traffic

Example: WAFL_SPINNP_READ is used for user reads


Refers to some internal WAFL operations that may not be classified in other operation types, but are background in nature

Example: A FlexClone is being split

Refers to anything passing to/from disk

An internal WAFL message, but is only meant to be used by NetApp Employees only, but a few are provided below:

refers to deduplication (scheduled/post-process or inline)
Term Meaning

CPU Utilization

Latency histograms System (internal) and client latency.
Disk I/O operations Reads and writes from disk in MB and in terms of RAID messages.
NVLog utilization
Memory utilization(Debug only)

Shows buffer cache and inode cache usage in terms of MB used.

Note: Not meant to be used for performance troubleshooting, but only by NetApp Engineering.

I/O Utilization I/O utilization refers to the amount of data read or written in MB/s and IOPS.




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