tcpdump is a tool used for network packet capturing or packet analyzer that works for most of the unix-like operating systems. Also you can call as packet sniffer that operates on packet level. It allows users to capture and display TCP/IP and [...]
How to Find Network Interface Details Using Linux Mii-Tool
Both mii-tool and ethernet tool allow Linux system administrator to modify or change or check the network interface card. Both the tools can be used for diagnostic and identification of ethernet devices. Even you can control the links, set the auto-negotiation [...]
How to Extend and Resize LVM Partition in Linux
Logical Volume Manager(LVM) allows the Linux kernel to manage large disk drives effectively. This allows users to create partitions from more than one disk and allows them to extend the filesystem size online within a few seconds. In this article, [...]
Linux Scan for New Scsi Device to Detect New Lun without Reboot
How do you verify or scan once storage LUN is mapped or allocated to your system? In this article, I will show you how to scan scsi device on Linux system. Reboot is one option to see the allocated disk [...]
Can dd Command Used To Wipe Data? Examples
dd is a common Unix program whose primary purpose is the low-level copying and conversion of raw data. You can use this command backup whole hard drives, create a large file filled with only zeros, create and modify image files [...]
How To Use Linux Kill Command
The word kill itself shows its clear meaning and purpose. In Linux, kill command is used for terminating the process. The command kill sends the specified signal to the specified process or the process group. First we need find PID [...]
Creating Logical Volume On Existing Volume Group In Linux
Create logical volume on existing VG (Volume group) First make sure you have proper space to create new lv. From the below output, you can see there is enough space to have a new lv: #vgdisplay /dev/vg01 --- Volume group [...]
CPU Bottleneck - How To Use Vmstat, Mpstat and SAR Commands
One of the main functions the kernel or Operating System is Memory Management. When process try to access physical memory, if physical memory not free, than kernel move the inactive processes to virtual memory then it is called Paging. To know [...]
6 Commands to Monitor CPU Usage in Linux
CPU is core part the system and processes all the task. There are many methods to check the CPU performance on linux system. Most commonly used commands are top, ps, sar, iostat, mpstat and to check the daily CPU performance. [...]
Hard Mount vs Soft Mount in NFS with Example
Using NFS protocol, the NFS client can mount the filesystem existing on a NFS server, just like a local filesystem. For example, you will be able to mount “/home” directory of host.nfs_server.com to your client machine as follows: # mount [...]
How to Find Unallocated Space on Linux
When managing a server, you can need to operate on data storage. To do it better, you can need to know how to manage unallocated disk space. Unallocated space is the unused space on the Hard disk which has not [...]
How to Access/Mount Samba Share on Linux Command Line
Samba is a service in Linux that provides seamless file and print service to SMB/CIFS clients. One of the main features of Samba is that it allows interoperability between Linux/Unix servers and Windows-based clients. In general, you can share resource-like files [...]
SAN vs NAS vs DAS - How it Differs Each Other
This article we will explain the very basic features of SAN and NAS devices. There are a lot storage vendors providing NAS and SAN devices like Dell ( EMC merged), NetAPP, Hitachi, Hewlett Packard Enterprise and IBM. Based on the [...]
How to Create, Format and Mount Filesystems in Linux
A filesystem is an organization of data and metadata on the storage device. If you want to access any files in unix-like OS, the filesystem has to be mounted where the file resides. The well-know Linux filesystems are Ext, Ext2, [...]