100.00% util I/O in Linux VM guest after start live migration

(Doc ID 2191462.1)

Last updated on NOVEMBER 19, 2017

Applies to:

Oracle VM - Version 3.4.1 and later
Linux OS - Version Oracle Linux 6.1 with Unbreakable Enterprise Kernel [2.6.39] to Oracle Linux 6.6 with Unbreakable Enterprise Kernel [3.8.13] [Release OL6U1 to OL6U6]
Linux OS - Version Oracle Linux 7.2 with Unbreakable Enterprise Kerne [4.1.12] to Oracle Linux 7.4 with Unbreakable Enterprise Kerne [4.1.12] [Release OL7U2 to OL7U4]
Information in this document applies to any platform.

Symptoms

Before live migration, I/O were normal in the Linux VM guest:

 

Issue happens with Oracle Linux 6/7 VM guest running kernel prior to UEK3 kernel 3.8.13-68.2.1 or UEK4 kernel 4.1.12-103.9.2.

 

Cause

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