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Active IQ Unified Manager Alert: High Node Utilization Fragmentation

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Applies to

  • OnCommand Unified Manager (OCUM)
  • Active IQ Unified Manager (AIQUM)
  • ONTAP 9

Notes:

  • OnCommand Unified Manager has been rebranded to Active IQ Unified Manager as of the 9.6RC1 (and later) releases
  • For the purposes of this document, Unified Manager will be referred to as ActiveIQ Unified Manager (AIQUM)

 Issue

  • Active IQ Unified Manager reports node disk fragmentation warning alerts in the volumes in the cluster
  • However, performing a reallocate measure displays a very low fragmentation (level 1 or 2).

Example:

From: "Active IQ Unified Manager" <aiqum@company.com>
Date: Jul 4, 2017 6:01 AM
Subject: Performance Alert - 1 new warning system-defined threshold(s) breached on Cluster cluster1
To: "Storage Admins" <storageadmins@company.com>

 Warning System-defined Threshold Event
________________________________________

Summary
Trigger Time:  5:39 am, 4 Jul EDT
Description:  1 new warning system-defined threshold(s) breached on Cluster cluster1
________________________________________

p-sdt-cluster1-nod-1212

Policy Name: Node disk fragmentation
       A WARNING event has been triggered on node1 based on the detection of high node utilization caused by high
       percentage of delayed disk write on node1_aggr_sas1.

 

 

 

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