Oracle RAC H/A Failure Causes Oracle Linux Node Eviction On Server With IBM Integrated Management Module (IMM)
(Doc ID 1629814.1)
Last updated on MAY 25, 2021
Applies to:
Linux OS - Version Oracle Linux 5.5 to Oracle Linux 6.5 [Release OL5U5 to OL6U5]Oracle Database - Enterprise Edition - Version 11.2.0.1 and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Backup Service - Version N/A and later
Oracle Database Cloud Exadata Service - Version N/A and later
Linux x86-64
Linux x86
Symptoms
An Oracle Real Applications Cluster (RAC) cluster node may be evicted because of a high-availability (H/A) failure. The first cluster node starts without errors, but other nodes will not join the cluster.
The root cause is a network IP address conflict. Servers which use the IBM Integrated Management Module (IMM) are vulnerable to this issue.
In its default configuration, the IMM is configured to use an IANA (Internet Assigned Numbers Authority) network address range assigned for 169.254/16, a "Link Local" address range. However, this is not a routable network address range. For more information about this network address classification, please refer to the IETF RFC-3927 document.
The defining characteristics of this issue are somewhat obscure. Easier by far is to know that the server includes an IMM device and then simply check the ifconfig(8) command output to determine if any interface is assigned a link-local address from the 169.254/16 network.
Signature Entries In /var/log/messages:
Detecting this issue begins by finding entries similar to those marked below in the system /var/log/messages file:
Cause
To view full details, sign in with your My Oracle Support account. |
|
Don't have a My Oracle Support account? Click to get started! |
In this Document
| Symptoms |
Signature Entries In /var/log/messages: |
| In The CRS Node Logs: |
| To See The Offending Interface: |
| Cause |
| Solution |
| Disable The IMM Device: |
| Blacklist The IMM Device: |
| Using IMM On The Server: |
| References |