Sun Storage 7000 Unified Storage System: ZFS - Slow resilvering and/or zpool scrub

Asset ID:	1-72-1164934.1
Update Date:	2018-05-10
Keywords:

Solution Type Problem Resolution Sure

Solution 1164934.1 : Sun Storage 7000 Unified Storage System: ZFS - Slow resilvering and/or zpool scrub

Applies to:

Sun Storage 7210 Unified Storage System - Version All Versions and later
Sun Storage 7110 Unified Storage System - Version All Versions and later
Sun Storage 7310 Unified Storage System - Version All Versions and later
Sun Storage 7410 Unified Storage System - Version All Versions and later
Sun ZFS Storage 7120 - Version All Versions and later
7000 Appliance OS (Fishworks)

Symptoms

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Resilvering runs for a very long time.
Resilvering reports 100% progress, but does not complete.
Scrub/resilver causes systemic slowdown.

Changes

N/A

Cause

Since we have sequential resilvering in the 2013.1.2 Release, there is no obvious report of such issues.

Any 'new' issues should be reported to Oracle Support.

NOTE: There are many factors that can affect the resilvering performance:

ZFS pool profile (mirror, RAID level etc.)
Size of the ZFS pool
Amount of I/O on the pool
Snapshot and Replication activity

Solution

Steps to follow:

Upgrade system software to the latest applicable Appliance Firmware Release for your system type. Enhancements to resilvering performance are included in later versions.

If still unsuccessful in completing resilver, pause any scheduled replication or snapshot jobs. After the "100%" mark of the resilver progress, the system is exclusively working on the new snapshots.

Creating additional snapshots, either directly or via replication, will delay the completion of the resilver.

NOTE: 'Fast resilvering' functionality is included in Appliance Firmware Release 2013.1.1.0 (and later). To take advantage of this enhancement, you must upgrade to 2013.1.1.0 (or later) and deferred updates must be applied.

Additional Resources:

Appliance help under Maintenance:System:Updates for software upgrade procedure and related information.

*** Checked for currency - 01-JUN-2016 ***

References

<NOTE:1496376.1> - Understanding the ZFS Pool Scrub Operation, Tuning Scrub Performance, and Troubleshooting Scrub Issues

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