Why rac node reboots

This process monitors the CSS daemon for hangs or scheduling issues and can reboot a node if there is a perceived hang of CSS threads. Unlike CSS which is responsible to maintain and monitor good health of all nodes in cluster, the OPROCD helps monitor the health of node locally for any issues with self node where it runs when vendor clusterware is absent.

Also, more so in pre NM polling threads. Due to the fast nature of the reboot, the CRS logging messages might not actually get flushed to the disk. CSSD Monito ora. Troubleshooting - Who Evicted Me? Were there any ocfs2, vendor clusterware, or panic related messages? Example 1:System Restart due to Node Eviction. Log files may look like this.

Feb 18 db01 kernel: SysRq : Resetting. Feb 18 db01 kernel: printk: 6 messages suppressed. Feb 18 db01 syslogd 1. Feb 18 db01 kernel: klogd 1. Feb 18 db01 kernel: Linux version 2. In above logs important point to notice is " kernel: SysRq : Resetting ".

Whenever you see SysRq command issued. This shows this node is evicted by some other node from cluster. The most common but not exclusive cause of missed NHB is network problems communicating over the private interconnect. Check OS statistics from the evicted node from the time of the eviction.

Validate the interconnect network setup with the Help of Network administrator. In these case Database instance is hang and is terminated afterwards , which cause either reboot cluster or Node eviction. Initiating system state dump. See Note Real Application Cluster Log files. In few of the cases, bugs could be the reason for node reboot , bug may be at Database level, ASM level or at Real Application Cluster level.

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Just e-mail: and include the URL for the page. All rights reserved by Burleson. Will that node always be rebooted? Same applies as above mentioned. Can one configure this behavior? No, Oracle Clusterware will decide on it. Related Question.