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• Partial-stroking / Short-stroking / Half-stroking Hard Drives?

  - by Daniel Magliola

  Could anyone here explain to me what is implied by this term? (I've seen the same thing mentioned with the 3 terms). At first when I read about it, for some reason I understood that it was some way of splitting the bytes across the platters of the disk, which sounded like a good idea and obviously doesn't make sense, because that wouldn't cut disk size in half (and disk are probably already splitting bytes across platters)... The best I've come to understand is that basically instead of creating one partition for the whole size of the disk, you create 2 partitions, and use only one of them, either the one in the "center" or the one in the "rim" of the platters, and since one of the two is faster (people didn't seem to agree on which one was faster), that makes everything better. Am I understanding this correctly? Has anyone tried this with their drives and had a good outcome? Thanks!

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• Why binding is not a native feature in most of the languages?

  - by Gulshan

  IMHO binding a variable to another variable or an expression is a very common scenario in mathematics. In fact, in the beginning, many students think the assignment operator(=) is some kind of binding. But in most of the languages, binding is not supported as a native feature. In some languages like C#, binding is supported in some cases with some conditions fulfilled. But IMHO implementing this as a native feature was as simple as changing the following code- int a,b,sum; sum := a + b; a = 10; b = 20; a++; to this- int a,b,sum; a = 10; sum = a + b; b = 20; sum = a + b; a++; sum = a + b; Meaning placing the binding instruction as assignments after every instruction changing values of any of the variable contained in the expression at right side. After this, trimming redundant instructions (or optimization in assembly after compilation) will do. So, why it is not supported natively in most of the languages. Specially in the C-family of languages? Update: From different opinions, I think I should define this proposed "binding" more precisely- This is one way binding. Only sum is bound to a+b, not the vice versa. The scope of the binding is local. Once the binding is established, it cannot be changed. Meaning, once sum is bound to a+b, sum will always be a+b. Hope the idea is clearer now. Update 2: I just wanted this P# feature. Hope it will be there in future.

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• How to install an SSL certificate on an home server with IIS

  - by Rushino

  I have a home server which i would like to add SSL certificate (via IIS). I believe self-signed certificates are a bad idea so i was wondering how this actually work to have one installed on my server. This server is currently being accessed being outside.. this is basically for learning/pratical purpose. So if i understand correctly, it is possible OR do we have to buy an SSL certificate somewhere and install it on the server for use ? (by importing it in IIS) what are the actual brief steps ? Thanks!

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• "Reboot and select proper boot device"?

  - by overtherainbow

  Hello I didn't find the answer in Clonezilla's site/mailing list archives. Maybe someone has already seen this issue and knows how to recover from it: On a test host, using www.partedmagic.com, I created two partitions: One to hold an OS I wish to use for testing (/sda1), and a second partition to hold images (/sda2) After trying out Windows7, I used CloneZilla to restore an XPSP3 image, but I get the following error message when rebooting: "Reboot and select proper boot device" Could it be that Clonezilla didn't save/restore the MBR? Gparted didn't let me set a partition as "active", so it could also be this, but I have no idea. Thank you for any help.

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• TextMate suddenly highlighting all text dark red...?

  - by AP257

  I'm using TextMate on Snow Leopard, don't know much about how it works. After I hit an unknown keyboard shortcut, it suddenly decided to highlight almost all text in my Python files dark red - making all my Python virtually unreadable! I must have accidentally pressed a shortcut - but I've no idea what I did or how to turn it off, and can't find any relevant help in the manual or form. Even just 'turn off all highlighting' would do. Anyone know how to turn this highlighting off? Bit desperate! UPDATE: Figured it out. There's a tiny, tiny dropdown list at the very bottom of every TextMate editing window where you can set the language, so TextMate can highlight invalid syntax - I'd accidentally clicked on it and set the language to something other than Python. Will leave the question up though in case others have the same problem.

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• Migrating a Windows Server to Ubuntu Server to provide Samba, AFP and Roaming Profiles

  - by Dan

  I'm replacing our old Windows XP Pro office server with a HP Microserver running Ubuntu Server 12.04 LTS. I'm not a Linux expert but I can find my way around a terminal prompt, I'm a Mac user by choice. The office use a mix of Windows XP Pro machines and OSX Lion laptops. I included Samba during installation, and I'm planning on using Netatalk for the AFP and Bonjour sharing. I'd quite like to have samba make the server appear in 'My network places' on the Windows machines the way Bonjour makes it appear in finder on the Macs, if this is possible? I want to get to a point so that a user logging into Windows, gets connected to the Ubuntu server (do they need an Ubuntu user account?) which get them their shares and their Windows user profile (though a standard profile across users would do). The upshot is to make centralised control of user accounts (e.g. If a person leaves, killing their account on the server stops their Windows logon and ability to access Samba shares) and to ensure files aren't stored on the individual machines for backup/security purposes. I want to make this as simple as possible, so don't want to have loads of stuff I don't need, I just can't figure out: What I need at the server end: - will Samba be enough (already installed as part of initial installation), or will I need to cock around with LDAP (and how does this interact with Samba) - For someone of moderate Linux competence like me, is there a package that offers easy admin of user accounts, e.g. a GUI like phpLDAPadmin (if LDAP is necessary) How to configure the XP machines: - do I need to have the XP machines set up as a domain controller (I've no idea, really) - roaming profiles looks to offer the feature of putting the user's files on the server rather than the machine itself along with a profile that follows the user from machine to machine. Syncing Mac user's home folders with the server This is less of a concern because I can set up Time Machine if it comes to it, but I'd appreciate any recommendations of what approach I should take having the Mac home folders synced to the server.

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• Preventing battery from charging

  - by intuited

  I'm running on UPS power and would like to prevent the laptop's battery from charging, to increase the amount of power available to other devices. Is there a way to do this? update The machine is a Dell Latitude D400. If people want more details, just ask. Also, I'm gathering that I need to explain my desired setup a little better. I've gotten a bunch of suggestions about taking the battery out. I'm not sure if people are suggesting to take the battery out while the machine is running — this, as I understand, is not a good idea with most laptops — or to just remove the battery altogether. The latter option is not optimal, because ideally I'd like to use the 30-60 minutes of power in the laptop battery and then switch over to UPS power. The details of the switch-over may constitute a separate question, but if I can't find a way to keep the laptop battery from charging, then removing the battery from the machine altogether may be the best way to do this. I'm not sure yet if this machine will run without a battery, but I'll check that out. Other than the laptop, the UPS is just supporting a cable modem and router and a USB hub. Again in the idealized version of this setup, all the power management changes would be automated, i.e. not require replugging anything or pressing Fn-keys. I'd like the machine to start using laptop battery power when apcupsd indicates that the UPS A/C is out, and then start using UPS power, but not charging the battery, when the battery is almost depleted.

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• Unexpected SQL Server 2008 Performance Tip: Avoid local variables in WHERE clause

  - by Jim Duffy

  Sometimes an application needs to have every last drop of performance it can get, others not so much. We’re in the process of converting some legacy Visual FoxPro data into SQL Server 2008 for an application and ran into a situation that required some performance tweaking. I figured the Making Microsoft SQL Server 2008 Fly session that Yavor Angelov (SQL Server Program Manager – Query Processing) presented at PDC 2009 last November would be a good place to start. I was right. One tip among the list of incredibly useful tips Yavor presented was “local variables are bad news for the Query Optimizer and they cause the Query Optimizer to guess”. What that means is you should be avoiding code like this in your stored procs even though it seems such an intuitively good idea. DECLARE @StartDate datetime SET @StartDate = '20091125' SELECT * FROM Orders WHERE OrderDate = @StartDate Instead you should be referencing the value directly in the WHERE clause so the Query Optimizer can create a better execution plan. SELECT * FROM Orders WHERE OrderDate = '20091125' My first thought about this one was we reference variables in the form of passed in parameters in WHERE clauses in many of our stored procs. Not to worry though because parameters ARE available to the Query Optimizer as it compiles the execution plan. I highly recommend checking out Yavor’s session for additional tips to help you squeeze every last drop of performance out of your queries. Have a day. :-|

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• How to solve Bumblebee/Nvidia Optimus issues with kernel 3.4 (works perfectly under 3.2)

  - by theJimy

  I installed Ubuntu and could setup to utilize my Intel HD 3000/Geforce GT 540M hybrid graphics perfectly with the method described here: How well do laptops with Nvidia Optimus work? Everything works fine under Kernel 3.2. Now I wanted to upgrade though to Kernel 3.4, as it brings many improvements, especially in saving battery life (ie. Intel RC6)... at least from what I heard. While I had no issues installing the 3.4 Kernel under Ubuntu 12.04 and everything so far runs fine, Bumblebee causes issues under kernel 3.4. When trying to run commands like optirun, lsmod (or similar kernel tools) these just lock up and never return. The Bumblebee developers seem to refuse to help with mainline kernels (as seen here: https://github.com/Bumblebee-Project/bbswitch/issues/17 ). Does anyone know, how to solve this issue? Could I solve this probably, by compiling the kernel and/or Bumblebee against the kernels sources myself and having a Ubuntu-like kernel? Any other idea that might help me to solve this myself, so I could profit from the 3.4 features and Optimus, would be very appreciated.

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• Linux Kernel IRQ Routing with irqbalance / kernel options

  - by tim

  I'm trying to get my Xen Dom0 distributing the irqs in an smp enviroment. As far as I know there are 2 Options: Use irqbalance Configure the kernel without cpu hotplug support My System is Debian Squeeze, Xen 4.0.4, Kernel 3.2.31. My Problem is: irqbalance segfaults due to a changed /proc/irq* layout or irq0 missing (this seems to be a very old bug existing since Lenny) To configure a kernel without cpu hotplug support you must disable cpu powermanagement which seems to be impossible through the standard wys (make config / make menuconfig) - the option CONFIG_PM simply defaults to "Y". Any idea anyone on how to get a debian dom0 kernel with a proper irq distribution?

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• Trouble opening my router to my web server [closed]

  - by justin

  Here's the story. I have a webs server created and connected to my router. The website works great when I'm connected to the router, but when I'm off the network I can't access the website. I got the IP for my router by googling "what is my ip." I have opened ports 80 to 10080 to link to the server in the router. THe firewall is off. I can ping the router. One odd thing that I don't understand. When I am in network if I access XXX.XXX.XX.XX:80 I can access the web page no problem. If I access XXX.XXX.XX.XX:81 (or any other port) I get the error "Cannot access server." Any idea what the problem could be? Could it be my ISP?

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• Getting into game/game engine programming

  - by Darkslash

  So I am interested in learning game programming, but I really have an interest in the lower level engineering in games. I have openGL experience, and I am really interested in learning more about implementing AI, Physics, etc. I have a computer science degree, so I really like getting into technical stuff. Many times when I ask about this sort of thing, I get a lot of "Use an engine", "Use Unity3d", "Why waste your time writing code that already exists", etc etc. My idea was to use simpler libraries such as SFML or XNA so that I could learn how to implement the more complex systems. The thing is, although I do want to write games, I want to learn things that using something like Unity simply doesnt teach you. My goal is not to make a current generation quality 3D game to sell, I just want to make some cool smaller games and learn all I can about the programming side of game development. Is this something that people just do not do anymore? It seems like everywhere I turn people are using Unity or UDK or GameMaker. I fully understand why you would use a tool like these, but I cant see how they would suit my purposes. So where does someone like myself turn? Am I trying to learn something that people just do not bother doing anymore? Is the innovation in this area gone and just all about gameplay now? Im sorry if this question seems silly, but I am genuinely interested in knowing more about this and meeting more people who are interested in this sort of thing.

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• How to improve battery life on Samsung 13.3” Series 7 Ultra (NP730U3E-S01AU)?

  - by beam022

  Recently I've bought a Series 7 Ultra Samsung ultrabook and decided to change the OS from originally installed Windows 8 to Ubuntu 14.04LTS. However, it's difficult not to notice great decrease in battery life: on pre-installed Windows 8 battery would last for about 6 hours while on Ubuntu it's almost empty after 2 hours of same kind of work (wi-fi, web, vlc, spotify, intellij idea). I'm not here to say that Ubuntu's battery performance is worse than Windows, but to ask for suggestions how to improve the situation (2 hours of work is pretty poor battery life). Can you recommend some sources, applications or tips/tricks that would improve battery life on my ultrabook? I really like the Ubuntu experience, but this makes my machine much less reliable. I suspect that graphic video card might be one of the issues here. Let me give you tech specs of the ultrabook: Processor: Intel® Core™ i5 Processor 3337U (1.80GHz, 3MB L3 Cache) Chipset: Intel HM76 Graphic: AMD Radeon™ HD 8570M Graphics with 1GB gDDR3 Graphic Memory (PowerExpress) and Intel(R) HD Graphics 4000 Display: 13.3" SuperBright+ 350nit FHD LED Display (1920 x 1080), Anti-Reflective Memory: 10GB DDR3 System Memory at 1,600MHz Hard-drive: 128GB Solid-state Drive More informations here, on the official page. If it's helpful to provide additional info, I'm happy to do it, just let me know what you need. Thank you.

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• Tunning scrolling in urxvt

  - by Ivan Petrushev

  Hello, I'm using rxvt-unicode version 9.06 at Ubuntu 9.10. I was used to aterm, where you can use SHIFT + up/down arrow to scroll the printed output with a line up or down. You can also use SHIFT + pgup/pgdown to scroll one screen up or down. In urxvt I can use the pgup/pgdown combination as well, but can't use the up/down arrow combination. It is very useful to be able to scroll by single lines. Do you have any idea how to enable the up/down arrow scrolling? This is my ~/.inputrc: set show-all-if-ambiguous on And this is my ~/.Xdefaults: URxvt*geometry:80x35 URxvt*transparent:true URxvt*shading:40 URxvt*saveLines:12000 URxvt*foreground:White URxvt*background:Blue URxvt*font: -*-terminus-*-*-*-*-14-*-*-*-*-*-*-* URxvt*color4:RoyalBlue URxvt*color12:RoyalBlue URxvt*scrollBar:true URxvt*scrollBar_right:false URxvt*scrollstyle:rxvt

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• First time application where to start?

  - by Nazariy

  After many years of searches and copy pasting, I'm still looking for simple solution that can transliterate text input on the fly from one key set to another. There are quite few online services that provide this feature but it still quite annoying to go online all the time. Unfortunately there is not that many applications left which are capable of doing so, and none of them supported by this day. I decided to make my own and at same time to learn something new for my self. The idea is quite simple: application should sit in system tray and wait until input language get changed, for example to Russian. If Russian language is activated, application should start to listen for user key strokes combination and replace them based on custom dictionary for example R = ?, SH = ? etc. I should be able to bind application to any installed language (Russian, Ukrainian, Bulgarian, Belarusian etc.) and customise dictionary for any of them. So my question is: Which language should I chose for this task C++, C# or might be something hardcore like Assembler, as application should work natively with Windows XP/Vista/7 or possibly Mac. (cross platform support is good but my main target is Windows) Due to nature of application behaviour how can I tell anti-virus software that it is not a "Key Logger" and basically not a virus? Where should I start and what should I be aware of? P.S. My current programming knowledge is quite basic, PHP and JavaScript with Object Oriented approach.

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• Virtual Box fails my OSes :(

  - by Kingston Town

  I have a little problem with Virtual Box latest version in which i have installed Mint (also latest version).During creation of a new vdi partition I chose settings as default, that is, I don't create any tiny partitions myself. The installation works. But later while the new OS is running (not in Live mode) I try installing/updating new software available, the system automatically fails, it reports an error of DISKFULL, I close the message box then power off my system. Later on I can't boot it up again anymore. It hangs with a black screen and the PAUSE status. I have no idea why. I have installed 2 OSes and both fail at the same error. I doubt something is not right about the current version of VBox. Thank you . My host OS is Windows7 and my Clients are Mint and CentOS

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• Does it make sense to develop open source python library for database inspection?

  - by gruszczy

  Some time ago I came up with an idea for a library for database inspection. I started developing it and got some very basic functionality, just to check if that's possible. Recently however, I get second thoughts, whether such project would really be useful. I am actually planning to develop following software suite: library for python, that would provide easy interface to inspect database structure, desktop application in PyQt that would use the interface to provide graphical database inspection, web application in Django that would use the interface to provide database inspection through the browser. Do you think such suite would be useful for other developers/database administrators/analysts? I know, that there is pgadmin for PostgreSQL and some tool for sqlite3 and that there is Java tool called DBInspect. Usually I would be against creating new tool and rather join existing project, but I am not Java programmer (and I would rather stick to python or C, which I like) and none of these projects provide a library for database inspection. Anyway I would like to hear some opinions from fellow developers, whether such project make sense or I should try to spend my free time on developing something else.

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• Facebook like button for a Facebook feed item

  - by jverdeyen

  Here is what I do: When the admin of a website i'm creating adds a new 'news' item to his website, it directly posts the same item on the Facebook 'fanpage' of the website. This is done by an Facebook app with the permissions to post an item on the Facebook fanpage. So far so good. I'm getting the new post id from the facebook graph. Here is what I want to achieve: I'm adding a 'like' button on the original website, but when this is clicked it should be referenced to the same post item on the facebook page. So if someone likes the news post on the website he should also like the referencing facebook feed post. Which is exactly the same. Can this be done? I've been playing around with the href etc of the like button, without any success. When I hit the like button it likes the url given, but is doesn't recognizes that this is a feed post. Any idea? Thx in advance.

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• Any tips for designing the invoicing/payment system of a SaaS?

  - by Alexandru Trandafir Catalin

  The SaaS is for real estate companies, and they can pay a monthly fee that will offer them 1000 publications but they can also consume additional publications or other services that will appear on their bill as extras. On registration the user can choose one of the 5 available plans that the only difference will be the quantity of publications their plan allows them to make. But they can pass that limit if they wish, and additional payment will be required on the next bill. A publication means: Publishing a property during one day, for 1 whole month would be: 30 publications. And 5 properties during one day would be 5 publications. So basically the user can: Make publications (already paid in the monthly fee, extra payment only if it passes the limit) Highlight that publication (extra payment) Publish on other websites or printed catalogues (extra payment) Doubts: How to handle modifications in pricing plans? Let's say quantities change, or you want to offer some free stuff. How to handle unpaid invoices? I mean, freeze the service until the payment has been done and then resume it. When to make the invoices? The idea is to make one invoice for the monthly fee and a second invoice for the extra services that were consumed. What payment methods to use? The choosen now is by bank account, and mobile phone validation with a SMS. If user doesn't pay we call that phone and ask for payment. Any examples on billing online services will be welcome! Thanks!

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• On setting up Apache and IIS to share the same IP

  - by miCRoSCoPiCeaRthLinG

  Hello, There are two different web-apps running on two (physically) different servers on our network... one of IIS and another one on Apache - both on port 80 since two machines are accessible by different IPs on our internal network. Now I want to expose both these services to the world. My idea is to somehow make the incoming connection redirect to the appropriate server based on user's choice of subdomain. Example xxx.domain.com maps to the IIS (Internal IP: 1.2.3.4) yyy.domain.com maps to Apache (Internal IP: 5.6.7.8) To the world, both these servers will share the same public IP. What kind of a configuration am I looking at and how do I go about trapping the subdomain requests and redirecting to the appropriate server? Thanks, m^e

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• Linux server remounted to read-only

  - by Eustahije

  I have tried to find anwser on SF, but no luck. Nothing worked. (and I have just basic knowledge of linux systems - I'm more developer) Hour ago I noticed that database is not reacting anymore. From some reason system went to readonly mode. Complete server is now, ofc, unavailable. Server is VPS in Dutch company, and have no idea what I can do with it now to unlock it. Every suggestion would be more then appriciated. I tried to save as much of database as possible but there are 20G of images, that would be hard to backup, but I can do that also, if that is something that is smart to do.

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• Cannot access Azure Portal: We were unable to find any subscriptions associated with your account

  - by Marc

  I am trying to get access to my Windows Azure Portal. Although I can access my user profile which shows two active subscriptions, I cannot access the portal (https://manage.windowsazure.com/). I get redirected to this site: https://manage.windowsazure.com/Error/NoSubscriptions, saying We were unable to find any subscriptions associated with your account. Now, this is a clear issue for the Azure support, but unfortunately, as azure thinks I don't have any subscriptions, I cannot get support, either, because I get redirected to the same error page. I've spent two hours talking and chatting with incompetent support people, i.e.: I've submitted feedback on the azure site but have no idea whether I will ever get a response. Maybe somebody has had this issue before, or can hint me which way to go?

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• Unix Server Partitioning & Filesystem Layout

  - by user1717735

  There's a lot of contradictory information about Unix server partitioning out on the internet, so I need some advice on how to proceed. So far, on the servers I in our test environment I didn't really care about partitioning and I configured a single monolithic / plus a swap partition. This partitioning scheme doesn't seem like a good idea for our production servers. I have found a good starting point here, but it seems very vague on the details. Basically I have a server on which I will be running a basic LAMP stack (Apache, PHP, and MySQL). It will have to handle file uploads (up to 2GB). The system has a 2TB RAID 1 array. I plan to set : / 100GB /var 1000GB (apache files and mysql files will be here), /tmp 800GB (handles the php tmp file) /home 96GB swap 4GB Does this sound sane, or am I over-complicating things?

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• ffmpeg trimming video

  - by Dori

  I am having a problem using ffmpeg which is driving me a little mad, so I hope someone can help me out. I have a 13 MPEG-4 .mp4 video of which I am attempting to trim the first two seconds off using ffmpeg and display in an Android app. From the numerous tuts online i am excecuting the following on the command line ffmpeg -i untrimmed_video.mp4 -vcodec copy -ss 2 trimmed_video.mp4 with no luck as it outputs a video of 4-seconds length (i have no idea where its getting 4 from), if i change this to 3 i still get a 4 second video, if i set it to 10 i get unplayable output. if i move the -ss arg to ffmpeg -vcodec copy -i untrimmed_video.mp4 -ss 2 trimmed_video.mp4 i get output the same length as the input, same as if i move to the end. I have tried lots of variations as orders and nothing seems to work, is this a bug, am i doing something wrong?! please help!!!

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• SQL SERVER – Poll – What would you love to see in SQL in Sixty Seconds?

  - by Pinal Dave

  Last week, I had my very first SQL in Sixty Seconds Video of this year. Lots of people send me email asking for me to continue this series as it was extremely fun at times to watch the video. I am going to start the series again in the month of June. However, I need your help to decide what would like to see in SQL in Sixty Seconds Videos. Here are quick poll and I requesting you to help me with the poll. Take Our Poll (function(d,c,j){if(!d.getElementById(j)){var pd=d.createElement(c),s;pd.id=j;pd.src='http://s1.wp.com/wp-content/mu-plugins/shortcodes/js/polldaddy-shortcode.js';s=d.getElementsByTagName(c)[0];s.parentNode.insertBefore(pd,s);} else if(typeof jQuery !=='undefined')jQuery(d.body).trigger('pd-script-load');}(document,'script','pd-polldaddy-loader')); Contest  If you leave a comment to this blog post and if I build a SQL in Sixty Seconds Video on it. I will send you a surprise gift (worth USD 25). Earlier Videos Here are few of my previous SQL in Sixty Seconds Video. Please check them out they should give you an idea what I usually cover in Sixty Seconds. Reference: Pinal Dave (https://blog.sqlauthority.com)Filed under: PostADay, SQL, SQL Authority, SQL in Sixty Seconds, SQL Query, SQL Server, SQL Tips and Tricks, T SQL, Video

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