Showing headlines posted by cmdln

Monitoring and analyzing performance is an important task for any sysadmin. Disk I/O bottlenecks can bring applications to a crawl. What is an IOP? Should I use SATA, SAS, or FC? How many spindles do I need? What RAID level should I use? Is my system read or write heavy? These are common questions for anyone embarking on an disk I/O analysis quest. Obligatory disclaimer: I do not consider myself an expert in storage or anything for that mater. This is just how I have done I/O analysis in the past. I welcome additions and corrections. I believe it’s also important to note that this analysis is geared toward random operations than sequential read/write workloads. Read the full story Analyzing I/O performance in Linux at cmdln.org

Dell is reversing its position on 3rd party drives. I don’t think I bothered to complain here but I sure sent my fair share of nasty grams. In fact Dell became one of my four letter words after I heard they were firmware locking Gen11 servers to only dell drives. Of course it was a mistake but I loved to unashamedly repeat the famous quote from Howard Shoobe.

A while back I wrote about using Apache as a dynamic reverse proxy. Anyone who has done even minimal research into web servers knows that Apache is the swiss army knife. It trys to be everything for everyone, and like a swiss army knife may not be as good as a more refined too at least as far as efficiency is concerned. (read the full article on transparent dynamic reverse proxy with nginx at cmdln.org)

A few days ago I finally got my copy of Running Xen. I was anxious to see how the information would be presented. I can tell you I was not disappointed. I am by no means a Xen master. I have tinkered with it a few times over the past several years but as I am getting ready to use it full time in production I need as much information as I can get. The books authors include Eli Dow, and Todd Deshane who worked on Xen and the Art of Repeated Research, as well as Quantifying the Performance Isolation Properties of Virtualization Systems. Read the full Review: Running Xen a Hands-On guide to the Art of Virtualization.

As I have said before life at the terminal is a joy. I constantly struggle with keeping myself organized. I actually work pretty well keeping most things in my head. But one of these days I’m going to fall down and hit my head and forget everything. So try and try again to keep myself organized and documented do I. I was recently pointed to TicGit its a ticketing system that is meant to integrate right into your repository. Well I’m not a developer but I can see the benefit for a terminal todo list and general ticketing for myself as well as my little script repository that is actually maintained in git. Well ok maybe maintained is a bit strong of a word. Anyway on to the good stuff. TicGit howto, command line ticketing system

I generally don’t have any issues knowing someone might be snooping on a bit of my traffic. However there are times you may want your traffic to be a bit more private. For example if your boss is a raging tyrant and your looking for a new job, and you know the sky would fall if he found out you emailed or happened to be on Career Builder or for that matter had even the slightest idea of abandoning him. Yes I am recounting something from my past, hey at least its distant past :). So if you find yourself in that situation read on for how to use tsocks and ssh as a simple proxy.