For VxFS versions previous to version 3.4, the only real conversion method involves a backup of the UFS data and a restore of the data to a new VxFS filesystem. It is impossible to “convert” a filesystem without some downtime.
When a system controller (SC) is hung, try a few steps before pressing the Reset button on the SC.
Installing required packages RHEL 5 has the Kdump packages installed by default. If for any reason they are not installed, you need to install the packages “kexec-tools-.rpm” and “system-config-kdump-.rpm” with the following commands: # rpm -ivh kexec-tools-.rpm system-config-kdump-.rpm or, if your system is registered at the Red Hat Network, by running # yum install [...]
A simple way to clear a machine’s entire ARP cache without rebooting, or deleting entries manually or waiting for timeouts.
Summary of typical IPMP Configurations: 1. Production and test interfaces in the same IP subnet 1.1 With defaultrouter 1.2 Without defaultrouter 1.3 With dedicated hosts acting as test targets with “host-routes” 1.4 Configuration example for 1.1, 1.2 and 1.3
To prevent network break-ins, the “-nosuid” option is used in ”/etc/vfstab” and the “/etc/auto*” configuration files used for NFS mounting filesystems. In “/var/adm/messages”, (the system log files), the following type of message appears frequently: “Date machinename enterprise: save,uid 0:setuid execution not allowed”
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