Question: How do I lookup the wwn address of my HBA card installed on the Linux system. I need this information to create zoning on my fiber channel switch. Answer: Use one of the following methods to view the HBA WWN address on Linux. Method 1: /sys/class/scsi_host/host{n}/device/fc_host:host{n}/port_name File On Redhat 5 and above (including OEL [...]
Ramesh Natarajan
Question: I would like to add more swap space to my Linux system. Can you explain with clear examples on how to increase the swap space? Answer: You can either use a dedicated hard drive partition to add new swap space, or create a swap file on an existing filesystem and use it as swap [...]
If you are a system administrator, or IT manager, or someone who is responsible for IT infrastructure, you should implement an enterprise level monitoring solution. The shell script you’ve written that does a ps -ef and sends you an email might do the basic job, but it doesn’t count as monitoring. If you want to [...]
By default, MySQL does not allow remote clients to connect to the MySQL database. If you try to connect to a remote MySQL database from your client system, you will get “ERROR 1130: Host is not allowed to connect to this MySQL server” message as shown below. $ mysql -h 192.168.1.8 -u root -p Enter [...]
RAID stands for Redundant Array of Inexpensive (Independent) Disks. On most situations you will be using one of the following four levels of RAIDs. RAID 0 RAID 1 RAID 5 RAID 10 (also known as RAID 1+0) This article explains the main difference between these raid levels along with an easy to understand diagram. In [...]
Question: I have purchased Linux support for RHEL and OEL from Oracle corporation. How do I register my Linux system to Oracle support network to download and update packages? Can you explain me with step-by-step instruction? Answer: After purchasing Linux support from Oracle, you should register your Linux system with Oracle’s Unbreakable Linux Network using [...]
As part of our on-going VMware series of articles, we earlier discussed about how to install VMware ESXi server, and how to install vSphere Client. In this article, let us see how to create a new datastore using vSphere client. 1. View Existing ESXi VMware Datastores Launch vSphere Client -> Click on the top node [...]
When I drafted this article, I really came-up with 7 sysadmin habits. But, out of those 7 habits, three really stood out for me. While habits are good, sometimes rules might even be better, especially in the sysadmin world, when handling a production environment. Rule #1: Backup Everything ( and validate the backup regularly ) [...]