There are several commands to determine the WWN of a Fibre Channel (FC) HBA and their status (online/offline). The post discusses few of the most commonly used methods. Method 1 To find the HBA cards installed on your system use : # lspci -nn | grep -i hba 07:00.0 Fibre Channel [0c04]: QLogic Corp. ISP2532-based 8Gb Fibre Channel to PCI Express HBA [1077:2532] (rev 02) 07:00.1 Fibre Channel [0c04]: QLogic Corp. ISP2532-based 8Gb Fibre Channel to PCI Express HBA [1077:2532] (rev 02) To … [Read more...] about How to identify the HBA cards/ports and WWN in Linux
Archives for September 2015
CentOS / RHEL 6 : How to configure kdump
kdump is an advanced crash dumping mechanism. When enabled, the system is booted from the context of another kernel. This second kernel reserves a small amount of memory, and its only purpose is to capture the core dump image in case the system crashes. Since being able to analyze the core dump helps significantly to determine the exact cause of the system failure, it is strongly recommended to have this feature enabled. This Note explains how to configure, test, and use the kdump service in … [Read more...] about CentOS / RHEL 6 : How to configure kdump
CentOS / RHEL 7 : How to configure kdump
kdump is an advanced crash dumping mechanism. When enabled, the system is booted from the context of another kernel. This second kernel reserves a small amount of memory, and its only purpose is to capture the core dump image in case the system crashes. Since being able to analyze the core dump helps significantly to determine the exact cause of the system failure, it is strongly recommended to have this feature enabled. 1. Install the kexec-tools package if not already installed To use the … [Read more...] about CentOS / RHEL 7 : How to configure kdump
CentOS / RHEL 7 : How to change / set hostname
Unlike CentOS/RHEL 6, manually appending "HOSTNAME=xxxxx" into file /etc/sysconfig/network and restarting system will not work on CentOS/RHEL 7, in order to change/set the hostname. There 4 ways to change the hostname in CentOS/RHEL 7 : You can use either of following methods to change the hostname 1. use hostname control utility: hostnamectl 2. use NetworkManager command line tool: nmcli 3. use NetworkManager text user interface tool : nmtui 4. edit /etc/hostname file directly (a reboot … [Read more...] about CentOS / RHEL 7 : How to change / set hostname