Oracle VM Oracle Linux 5 UEK1 PVM guest may experience I/O hang to one disk device or connectivity loss to one network device

(Doc ID 1644079.1)

Last updated on APRIL 23, 2018

Applies to:

Oracle VM - Version 2.1 and later
Linux x86
Linux x86-64


An Oracle VM Oracle Linux 5 (OL5) Paravirtualised (PVM) guest running the Unbreakable Linux Kernel Release 1 (2.6.32-*.el[5,6]uek) may sporadically experience I/O hang to only one storage device.
Alternatively, the guest may eperience loss of network connectivity to only one network device.
If the guest Virtual Machine (VM) is running fence-capable software e.g. Oracle Real Applications Cluster (RAC)/Grid Infrastructure (GI), OCFS2, etc., the inability to perform disk or network heartbeat to/via an affected device may result in node fence (cluster eviction, reboot).
The issue is unpredictable, but known to affect guest VMs under high I/O load, as well as idle guests.

Symptoms of the issue include:




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