VCS uses the Group Membership Services/Atomic Broadcast (GAB) protocol for cluster membership and reliable cluster communications. GAB has two major functions.
The one problem that is vrey common in every system administrator’s life is network issue, and most of the times it will kill entire day if the root cause/symptoms were misunderstood . Below information will help you to understand some of the basic network issues and their troubleshooting procedure
This error message is logged by NTP daemon, and this means that the ntpd fails to adjust OS internal clock for some reasons. NTP daemon adjusts OS internal clock by invoking system call named adjtimex(). Linux kernel expects the system call to be invoked regularly, as NTP daemon does so normally. When the interval becomes [...]
Dynamically adding LUN’s to Qlogic HBA on Linux: 1. Make sure that newly configured LUN’s are properly configured and mapped to correct HBA’s 2. If you have installed SANsurfer GUI/CLI, make sure newly added LUN’s are visible from these tools
The following is useful information on how to determine the cause of a system crash at the ok prompt, using the open boot commands. The Synchronous Fault Status Register (SFSR) provides information on exceptions (faults) issued by the Memory Management Unit (MMU).
Collect the following information when a platform reports SCSI disk errors: The following files: /var/log/messages* The output from the following commands: /sbin/fdisk -l /bin/cat /proc/scsi/scsi /bin/dmesg
About Author : My name is Ramkumar Ramadevu ( Ramdev ). I have started writing about enterprise unix system administration since 2009 just for my own knowledge reference, and then later I have made this site available for everyone, for better purpose. ... read more