It seems that podcasts are getting more popular by the day. I usually don't add them to the top 5 as it's not really a blog post however some of them would deserve it. A couple of weeks I already mentioned Mike Laverick's chin wags and this week I want to give an honourable mention to Virtumania hosted by Rich Brambley and Marc Farley.
Joshua Townsend - Storage Basics – Part VI: Storage Workload Characterization You’ll recall that we divide into 1000 to remove milliseconds from the equation, leaving (Seek Latency + Rotational Latency) as the important part of the equation. Rotational latency is based on the spindle speed of the disk – 7.2k, 10k, or 15k RPM for standard server or SAN disks. If we consider the same Seagate Cheetah 15k drive from Part II, we see that rotational latency is 2.0ms. The only way to change rotational latency is to buy faster (or slower) disks. This essentially leaves seek latency as the only variable that we can “adjust”. You’ll also recall that seek latency was the larger of the latencies (3.4ms for read seeks, and 3.9ms for write seeks) and counts more against IOPS capability than does rotational latency. Seeking is the most expensive operation in terms of performance.
Rich Brambley - Why Does Cloning A VM From Template Take A Long Time? Obviously, the type/performance of the disks, the number of disks, and the type of array makes a huge difference. I should also point out that I am using 8 ms as the value for the seek latency. I’m not as focused on technical accuracy because my point is served without it, but changing this value makes a significant difference as well. If you want technical accuracy and more explanation about some of the numbers to use in the calculator check out these posts on the topic of IOPS and the impact on a virtual environment...
Luc Dekens - LUN report – datastore, RDM and node visibility When you are running multi-node vSphere clusters, you probably already had the experience that one or more of your LUNs were not visible on all nodes. Now you can try to find out which LUN is missing on which node the hard way through the vSphere client. Or you can use the force of PowerCLI and run a script that will report all this in a handy spreadsheet.
Scott Drummonds - Processor Utilization Calculations Where things get really confusing is when these results are combined into three system-wide, aggregate utilization numbers, as seen by esxtop’s batch printout. The three utilization types above generated different utilization numbers. Unfortunately esxtop’s batch mode labels these counters slightly differently.
Vaughn Stewart - Raising Awareness Around the Misalignment of Data Duncan Epping - Aligning your VMs virtual hard disks In my opinion there is no need to discuss VMFS alignment. Everyone, and if you don’t you should!, creates their VMFS via vCenter which means it is automatically aligned and you won’t need to worry about it. However you will need to worry about the Guest OS. Take Windows 2003, by default when you install the OS your partition is misaligned. (Both Windows 7 and Windows 2008 create aligned partitions by the way.) Even when you create a new partition it will be misaligned. As you can clearly see in the diagram above every cluster will span multiple chunks. Well actually it depends
26.09.2013 The End of the Google Summer of Code The GSoC coding period has ended last Monday. In this blog post, I will summarize what I have done during the summer, to give a general idea of what you can expect from a future version of Nepomuk, if my work is accepted by the Nepomuk maintainers. The source code of the first two projects is available in the steckdenis-gsoc2013 branches of the nepomuk-core and nepomuk-widgets Git repositories. The browser plugin can be found in the scratch/dsteckelmacher/nepomukintegration.git scratch repository. The Nepomuk Query Parser The first part of my GSoC project was to implement a new ...02.04.2009 Milian Wolff (milianw): KDevelop Hack Sprint Huzza! The KDevelop Hack Sprint 09 is now official. Thanks to the huge engagement of Alexander Dymo we will meet from the 19th to 26th April 2009. The meeting will take place at Alexander’s university, the national university of shipbuilding in Odessa, Ukraine. Thanks to the people there responsible for making this sprint possible by providing us with the premises, internet, power etc. Since this is my very first Hack Sprint and considering that I only recently started contributing to KDE in general and KDevelop in particular I am very excited. The topics I will plan to hack on include (...14.07.2010 Mario Fux (unormal): KDE work day 1 - xml and nepomuk I’m sitting in the train from Zurich to Burgdorf (Switzerland) and want to report, dear reader, about my first week of KDE (or atm qt) development. It was not really as I planned it, I did not work a whole day on qt and kde, but several hours during the week. As I told you last week my first week was about an xml indenter. Some years ago when I started to track routes for OpenStreetMap.org my Garmin GPS device spat out bad formatted xml (GPX) files. Bad means here that all of the content was on one line and as I sometimes wanted to extract single tracks me and the dear editor (Kwrite or ...15.01.2009 Aaron Seigo (aseigo): building a community around your F/OSS project Today has turned into another writing day for me. Huzzah! I started going through my list of blog-posts-I've-not-yet-written and decided to punctuate the day with a couple of them. So let's talk a bit about building a community around your F/OSS project.Usual disclaimers apply: this is what works for me, it may not work for you; I could be completely insane and talking about my posterior; I probably am just repeating what other people have said elsewhere; I'm going to be hypocritical in places by giving advice that I don't follow overly well myself. So there.Onwards!Why It MattersIt is not unc...27.01.2010 Troy Unrau: Camp KDE coverage summary Hi guys, I was preparing this summary of blogs and other coverage of Camp KDE to forward to our sponsors to show the activity occurring at the event. I figured I'd share it with the planet, if you folks are interested. If blogging is a measure of productivity, we certainly set the bar high. :) Dot.kde.org Posts (during and around the event only):http://dot.kde.org/2010/01/16/camp-kde-about-starthttp://dot.kde.org/2010/01/17/day-one-camp-kde-2010http://dot.kde.org/2010/01/21/camp-kde-2010-continues-more-talkshttp://dot.kde.org/2010/01/21/camp-kde-day-three-technical-talks-summarieshttp://dot.kd...16.02.2010 Aurelien Gateau: A week in Portland, Oregon I spent the first week of February in Portland, where I attended Canonical Platform Sprint for Ubuntu Lucid. We got some good work done on the DBusMenu front. You can read about it on Jono and Jorge blog posts. 18.05.2008 Michael Pyne (mpyne): Usability in interfaces So on an article on a programming weblog. The topic of the article was a group that decided to make a copy of Funpidgin and was essentially created because the people making the copy feel the Pidgin development team are not listening to the needs of their users. Celeste Lyn Paul, one of the KDE team’s usability designers (the group that tries to make the software we make actually usable by the end user) a comment about the amount of issues that people bring in the name of usability. He then later posted a S5W nuclear reactor plant. This plant was very old by the time I qualified on it (M...01.03.2008 Niels van Mourik (nielsvm): Re-entering the blogosphere Hello there blogosphere, It has been almost one year ago the last time I wrote a entry in this dusty blog. And since then, a lot of things changed in my life and on the web. And one of those is that I got a new, and my first serious job back in June last year. So, back in June ‘07 I started working at the funny called company FOSDEM took place at the free university of Brussels, Belgium. After some bad experiences with hostels the previous years I subscribed to the organised KDE accomodation by Lydia Pintscher (Quassel). Before the event started the FOSDEM people organised the ‘Fri...08.05.2010 Ronny Yabar (ronnyml): First steps with Grantlee and my KDE PIM GSoC project Well, coding officially starts on May 24, now is time supposed to read documentation, know your mentor(s) and discuss the project ideas, needs, requirements, difficulties, etc. but as many other GSoCers I couldn’t resist to code something. My goal for the last week was to write a very simple Qt application showing the power of Grantlee. The idea was to simulate that I am reading a message in Kmail and I want to change the theme again and again. You can take a look at the code in the soc-pim branch or: svn co svn://anonsvn.kde.org/home/kde/branches/work/soc-pim/kdepim/examples/mail_grantl...05.03.2008 Mike Arthur (mikearthur): Where is the love? I realise I’m probably going to get lynched for this but I think it needs to be said. If you, as a KDE developer, get annoyed with a KDE feature you didn’t write and feel like blogging about your bad interaction with a part of KDE or a spat with another KDE developer then please don’t. You have every right to do so but it isn’t good for you, it isn’t good for the other developer and it is really bad for KDE. The problem with a community like KDE doing the majority of their work online is that sometimes we forget basic social rules of interaction. If your blog is o...