IBM LinuxONE is an enterprise-grade Linux® server with a unique architecture designed to meet the needs of mission-critical workloads for regulated industries. It brings together IBM's experience in building secure, resilient and scalable systems with the openness of the Linux operating system.
IBM's commitment to Linux stems from the belief that Linux is not only a world-class operating system, but that it also provides flexibility, choice, and an attractive total cost of ownership that can benefit IBM customers.
LinuxONE Rockhopper is an entry-level mainframe. It's designed for clients and emerging markets seeking mainframe speed, security and availability but for a smaller price-tag. The z13 mainframe series can hold up to 10 TBs of memory. Its 8-core z13 CPU can run up to 5GHz.
With up to 30 configurable cores, Rockhopper II has performance and scaling advantages over the previous Rockhopper system which had only 20 cores available.
LinuxONE is a mainframe series that runs on Linux created by IBM as a way of competing with cloud computing solutions. The systems are named after penguins as a nod to the Linux mascot. The flagship large enterprise series of mainframes is called Emperor and their mid-sized business series is called Rockhopper.
IBM z/VM virtualization software
It supports Linux®, z/OS®, z/VSE® and z/TPF, and Red Hat® OpenShift® Container Platform (link resides outside of ibm.com) based on Red Hat CoreOS on IBM Z® and LinuxONE servers. IBM z/VM can host up to thousands of virtual servers on a single system.
Linux is a Unix-like operating system kernel. zLinux is a port of Linux to IBM mainframe hardware. zLinux is for zSeries hardware (IBM mainframes). If the WIkipedia article is correct, it's a generic name for several different implementations of Linux on z machines, not a specific program product.
| Platform | Operating system |
|---|---|
| Linux on IBM® Z | Red Hat Enterprise Linux 7.4, 7.5, and 7.6 |
| Ubuntu 18.04 LTS and 16.04 LTS | |
| SUSE Linux Enterprise Server 12 SP3 |
Linux is a Unix-like operating system kernel. zLinux is a port of Linux to IBM mainframe hardware. zLinux is for zSeries hardware (IBM mainframes). If the WIkipedia article is correct, it's a generic name for several different implementations of Linux on z machines, not a specific program product.
Bash is a Unix shell and command processor written by Brian Fox for the GNU project. It is free software and acts as a replacement for Bourne Shell. It is an interpreted and not compiled process which can also be run in the terminal window.
This allows users to write commands and cause actions. Bash is capable of reading commands from shell scripts.
LILO means Linux Loader is a boot loader that is used for the Linux operating system. Most of the Linux Operating systems use LILO, to boot the operating system into main memory to start the operations.
CLI means Command language Interpreter. It interacts with the computer program, where the user issues command in the form of text lines. It Interacts with the computer terminals also, the interface accepts the text lines and converts them as a command to the operating system.
Linux was one of the first open-source technologies, many programmers added software that completely open to the users, which means you can download the file and change the code as you like. It has a wide range of options for users and increased security.
Disadvantages of Open Source Operating System mentioned below
They are five Shells in Linux:
Basic components of Linux
Five process states in Linux. They are
The process management system calls in Linux:
System calls to get the Process id :
There are three user-based permission groups for each file and directory.
They are:
Linux file system stores and handles the data. Without a file system, it cannot know where the file starts from and where the file ends.
In Linux, there are many file systems:
Ext, Ext2, Ext3, Ext4, JFS, XFS, btrfs, ufs, autofs, devpts, ntfs and swap.
Difference between Bash and Dos
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Bash
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Dos
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Commands are case sensitive
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commands are not case sensitive
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Backward slash(/) represents directories separator
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‘/’ represents command arguments
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Forward slash ‘’ represents escape character
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‘’ represents directories separator
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Does not follow conventions naming in files
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Follow naming convention in files
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It is a form of redirection that is used in Linux, it is used to combine more than two commands and the output of one command can take as input to the next command.
Syntax:
command_1 | command_2 | command_3 | .... | command_N
It is a process whose execution is completed but even the information exists in the process table. It occurs for the child process because the parent process needs to read the child process status. Once it is completed using the wait system call, then the zombie process is removed from the process table. This is known as Zombie Process.
top command displays and updates sorted process information. Use this top command to determine which processes are running and how much memory and CPU they are consuming.
netstat command in Linux shows the network status. This netstat command shows network ports in use and their incoming connections.
ls of command lists the open files associated with your application.
Users can use the df command to troubleshoot disk space issues. Here df stands for display free disk space.
df Command Example:
df -h
du command in Linux is used to retrieve more detailed information about which files use the disk space in a directory.
du Command Example:
$ du -sh /var/log/*
1.8M /var/log/anaconda
384K /var/log/audit
4.0K /var/log/boot.log
0 /var/log/chrony
4.0K /var/log/cron
4.0K /var/log/maillog
64K /var/log/messagesiptables command blocks or allows traffic on a Linux host, similar to a network firewall. This iptables command may prevent certain applications from receiving or transmitting requests.
| Linux | Windows |
| Linux is available for FREE | It is paid software |
| It is an Open-Source operating system | It is not an open-source OS |
| Linux customization is possible | No customizations are available |
| It provides high-level security | Can't defend virus and malware attacks unless until it is paid |
| Primary partitioning and logical partitioning available to boot | Booting available while primary partitioning only |
| BackSlash separates directories | The forward slash separates directories |
| File names are case particular | Irrespective of the case while naming files |
It is a centralized server that does not have any exists states on the working station. It may have scenarios when a state of a particular system takes a snapshot then, the user wants all other machines to be in that particular state.
Features of Stateless Linux Server