Disk: ZFS DMU Operations

This statistic shows ZFS Data Management Unit (DMU) operations/second.

An understanding of ZFS internals is required to properly interpret this statistic.

When to Check ZFS DMU Operations

Troubleshooting performance issues, after all relevant standard Analytics have been examined.

The DMU object type breakdown can identify if there is excessive Data Deduplication Table (DDT) activity. For more information about data deduplication, see Data Deduplication in Oracle ZFS Storage Appliance Administration Guide, Release OS8.8.x.

ZFS DMU Operations Breakdowns

Table 6-17 Breakdowns of ZFS DMU Operations

Breakdown Description

type of operation


DMU object level


DMU object type

ZFS plain file/ZFS directory/DMU dnode/SPA space map/...