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Linux Monitoring and Managing Linux Software RAID
Post date: April 15, 2005, 19:04 Category: System Views: 56
Tutorial quote: Systems administrators managing a data center face numerous challenges to achieve required availability and uptime. Two of the main challenges are shrinking budgets (for hardware, software, and staffing) and short deadlines in which to deliver solutions. The Linux community has developed kernel support for software RAID (Redundant Array of Inexpensive Disks) to help meet those challenges. Software RAID, properly implemented, can eliminate system downtime caused by disk drive errors. The source code to the Linux kernel, the RAID modules, and the raidtools package are available at minimal cost under the GNU Public License. The interface is well documented and comprehensible to a moderately experienced Linux systems administrator.

In this article, I'll provide an overview of the software RAID implementation in the Linux 2.4.X kernel. I will describe the creation and activation of software RAID devices as well as the management of active RAID devices. Finally, I will discuss some procedures for recovering from a failed disk unit.
FreeBSD Using Software RAID-1 with FreeBSD
Post date: November 28, 2005, 22:11 Category: System Views: 104
Tutorial quote: Have you ever needed a software RAID solution for a low-end server install? Perhaps you've wanted your workstation to take advantage of the redundancy provided by a disk mirror without investing in a hardware RAID controller. Has a prior painful configuration experience turned you off software RAID altogether on Unix systems?

Since 5.3-Release, FreeBSD comes with gmirror(8), which allows you to easily configure a software RAID 1 solution. While tutorials on gmirror exist, I found them to require either manual calculations of partition sizes with bsdlabel or the use of a fix-it floppy on an existing system.

It made more sense to me to configure RAID during the install of the operating system. I also wanted a procedure that was easy to follow and didn't introduce human error in the form of a math miscalculation. After cobbling together the available documentation and experimenting my way through various configurations, I came across a procedure that has worked well for me on several different systems. I also received valuable feedback from Pawel Jakub Dawidek, the author of gmirror, who gave some insight into some of the not yet documented features of gmirror.
Gentoo RAID over NFS
Post date: June 17, 2005, 07:06 Category: Network Views: 120
Tutorial quote: This is a HowTo to create a RAID over NFS. In this case RAID5, but can be easily adopted for other RAID levels.
Debian Debian RAID 1/5 system installer
Post date: May 28, 2005, 18:05 Category: Installing Views: 193
Tutorial quote: Instructions for installing a very clean Debian GNU/Linux system that boots from RAID 1, and has RAID 1 or RAID 5 root and data filesystems.

The examples assume two identical harddrives, sda and sdb, on which after a small boot partition, 1 GB is used for swap, 25 GB is used for the root filesystem and everything else is for a big "data" partition that will hold non-system stuff.
Debian Monitoring Services using Mon
Post date: April 4, 2006, 16:04 Category: Installing Views: 16
Tutorial quote: mon is a general-purpose scheduler and alert management tool used for monitoring service availability and triggering alerts upon failure detection. mon was designed to be open and extensible in the sense that it supports arbitrary monitoring facilities and alert methods via a common interface, all of which are easily implemented with programs in C, Perl, shell, etc., SNMP traps, and special mon traps.
Linux Bandwidth monitoring with iptables
Post date: December 27, 2005, 10:12 Category: Network Views: 63
Tutorial quote: Linux has a number of useful bandwidth monitoring and management programs. A quick search on Freshmeat.net for bandwidth returns a number of applications. However, if all you need is a basic overview of your total bandwidth usage, iptables is all you really need -- and it's already installed if you're using a Linux distribution based on the 2.4.x or 2.6.x kernels.
Gentoo EVMS Howto for Gentoo Linux
Post date: April 15, 2005, 00:04 Category: Hardware Views: 453
Tutorial quote: EVMS stands for Enterprise Volume Management System. It's a all-in-one utility written by IBM to manage disk partitions, logical volumes, software RAID and even filesystems.

It does everything from installing the partition table to mounting volumes, fscking and resizing them. It has a plugin mechanism which allow a user to extend EVMS with external drivers.
Debian Monitoring your bandwidth usage with vnstat
Post date: January 14, 2006, 15:01 Category: Network Views: 73
Tutorial quote: There are many occasions where it is useful to have an idea of your bandwidth usage, perhaps to know when you're going to be charged more by your ISP, or perhaps just as part of general monitoring. The vnstat tool is a simple means of doing just that.
BSD Managing Filesystems : fstab
Post date: April 15, 2005, 19:04 Category: System Views: 87
Tutorial quote: Understanding how the BSD filesystem manages disk space is critical to successfully managing a BSD server or workstation. However, this topic is generally overlooked since it is rarely used outside of installation and upgrades. It is also a very simple topic and most people assume you understand how it all works.

This article gives a quick synopsis on filesystem layout and tries to briefly explain how to understand /etc/fstab. The fstab(5) man pages, while good, do little to teach the basics to new sysadmins.
Debian Mailman with Postfix Configuration
Post date: April 10, 2006, 14:04 Category: Software Views: 16
Tutorial quote: Mailman is free software for managing electronic mail discussion and e-newsletter lists. Mailman is integrated with the web, making it easy for users to manage their accounts and for list owners to administer their lists. Mailman supports built-in archiving, automatic bounce processing, content filtering, digest delivery, spam filters, and more.