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Linux LVM: Reduce Filesystem and Logical Volume

March 14, 2012 – 5:07 pm | No Comment

The following example shows how to reduce the size of a filesystem mounted on an LVM logical volume. The instructions below are only for non-root filesystems. No reboot is required, but the filesystem will need to be unmounted. So, if there are any user applications using this filesystem, they will need to be stopped and the users will need to log out.

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Networking

Unix and Linux network configuration. Multiple network interfaces. Bridged NICs. High-availability network configurations.

Applications

Reviews of latest Unix and Linux software. Helpful tips for application support admins. Automating application support.

Data

Disk partitioning, filesystems, directories, and files. Volume management, logical volumes, HA filesystems. Backups and disaster recovery.

Monitoring

Distributed server monitoring. Server performance and capacity planning. Monitoring applications, network status and user activity.

Commands & Shells

Cool Unix shell commands and options. Command-line tools and application. Things every Unix sysadmin needs to know.

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Articles in Hardware

Tracking Prices of Hard Drives

July 5, 2009 – 5:40 pm | No Comment

It seems that only a year ago terabyte hard drives were a novelty item. Today they are on clearance at computer stores trying to free up the shelves for 1.5Tb drives and the 2Tb hard …

Palm TX: Review, Software, and Configuration

September 3, 2006 – 7:12 pm | 2 Comments

Recently I got a Palm TX and so far I like everything about it. Except for the $300 price tag. Built-in Wi-Fi card and a larger screen that can operate in landscape mode are the …

Applications »

OpenSUSE 11.4 Installation Overview

After enjoying taking apart Microsoft’s “cloud” Office 365 for the numerous shortcomings of its installation process, having to do the same for my favorite Linux distro – openSUSE – is rather upsetting. OpenSUSE installation routine went from nearly-flawless in 11.1 to mildly annoying in 11.3, arriving to moderately obnoxious in 11.4. What happened? Same as with Microsoft, poor installation workflow is to blame. One can always feel when desktop support people take over workflow tasks from server admins.

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Commands & Shells »

Configure Postfix to Use Gmail for Sending

Here is a simple script to help you configure Linux postfix to use your Gmail account for sending emails. The script has been tested on OpenSuse 11.4 and 12.1, but should work find on any recent Linux disro. The only requirement is that you have postfix insalled.

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Data »

Show Allocated / Used Filesystem Space Summary

On servers with many filesystems calculating filesystem space utilization summary can get very tedious. Below is a simple script that will summarize all filesystems and provide you will the totals for allocated and used space in GB.

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Hardware »

Quick Review: Boxee Box

Some of the technical issues with Boxee Box could have been fixed if the dev team was paying more attention to addressing the bugs rather than adding “features” of dubious value. In the final analysis, for the price and ease of use, Boxee Box is the best in its class and price range. You just need to be mindful of its limitations and buy it in hope of future improvements to its usability.

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Monitoring »

Simple Host Monitoring with SSH

Sometimes you just need something very simple to monitor a server or an application on a temporary basis. A basic ping monitor is fine, but it will only tell you if a server is responding on the network. It will not tell you if there is some other problem on the system. The script below relies on passwordless SSH setup to periodically log into the monitored nodes and check on their health by executing a local or remote script.

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Networking »

Red Hat: Changing Hostname and IP

Changing hostname and IP is frequently required when a server is being moved from testing or development to production. The process is a fairly simple one, but steps must be performed in a certain order to avoid complications.

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Scripts »

Windows Network Troubleshooting Script

I try my best to stay away from Windows. I wish my clients did the same. The usual difficulty of troubleshooting elusive network performance problems is amplified many-fold when there is a Windows computer at the end of the line. With Unix it’s relatively simple: run tests “a”, “b”, “c”, etc and follow the familiar process of elimination. With Windows in the picture the number of steps uses up all of the English alphabet and spills over well into the Russian one. And when you finally reach step “я”, you have to pull out your Chinese dictionary.

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UK Government Staff Caught Snooping On Citizen Data
An anonymous reader writes "More than 1,000 UK government staff have been caught snooping on citizen data — including criminal records, social security, and medical records. From the article: 'The U.K. government is haemorrhaging data — private and confidential citizen data — from medical records to social security details, and even criminal record […]
Social Networking: The New Workplace Smoke Break
snydeq writes "J. Peter Bruzzese sees a solution for organizations seeking to cut down employee time spent on social networks at work: treat social networking like a smoke break. 'Try as you might to keep social networks at bay, mobile devices let people be in constant connection to their social networking vices over the cellular networks, which yo […]
Ask Slashdot: Wrist Watch For the Tech Minded
NNUfergs writes "Sure, my smartphone can deliver just about any piece of information I could want in under 30 seconds, but I miss being able to just look at my wrist to get the time, date etc. I've been shopping around for a while and haven't come across anything particularly inspiring. There are loads of various features that have been incorp […]

Server Info

Server:	rowen.accountservergroup.com
OS    :	Red Hat 4.1.2-52
Kernel:	Linux 2.6.32.59-grsec
Arch  :	64-bit OS running on 64-bit hardware 
CPU(s):	16 x 4-core Intel Xeon CPU E5620@ 2.40GHz
RAM   :	24Gb (93% used), 16 x 2Gb DIMMs
Swap  :	6Gb (1% used), paging in/out: 0/0
Uptime:	15 days
Load  :	0, 0, 0
CPU % :	64 CPU cores at 0% combined utilization
Disk  :	util, svc time - sda: %, ms; 
Apps  :	MySQL 5.1.62, Perl 5.8.8
Issues:	occasional RAM shortages