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Understanding the ZFS Pool Scrub Operation, Tuning Scrub Performance, and Troubleshooting Scrub Issues (Doc ID 1496376.1)

Last updated on AUGUST 10, 2021

Applies to:

Solaris Operating System - Version 10 6/06 U2 and later
Oracle Solaris on x86-64 (64-bit)
Oracle Solaris on x86 (32-bit)
Oracle Solaris on SPARC (64-bit)
***Checked for relevance on 30-Jan-2019***

Purpose

This document explains how the ZFS pool scrub operation works, how to tune the performance, and how to troubleshoot issues relating to the ZFS scrub operation

Details

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In this Document
Purpose
Details
 
 What does the scrub operation do?
 Factors affecting zpool scrub performance
 Scrub Traversal Order
 Troubleshooting zpool scrub issues
 Changing the zpool scrub performance
 zfs_scrub_delay_ms
 zfs_scrub_delay
 zfs_max_scrubio
 zfs_top_maxinflight
 zfs_scan_idle_ms
 zfs_scan_idle
 zfs_scan_min_synctime_pct
 zfs_scan_min_time_ms
 Scrub and DeDup (DTT) Interaction
 Scrub FAQ
 Reference Material
 See Also
 Oracle Solaris ZFS Resource Center
References

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