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Can't start system due to mdadm failing

- by user101212

I used to have a 5-disk RAID5 partition, all working very well. I have then decided to add 3 more disks on it, totaling 8 equal disks. I've opened Webmin and just asked to add the disks. Then I've realized the three disks had NTFS partitions, wich mdadm didn't complain, so I tried to stop the growing to remove the Windows partitions. I've tried to remove a disk using the same Webmin, but (as you might guess and call me fool...), the system became unstable. By restarting the system, I've started receiving these messages: "udev[126]: timeout: killing '/sbin/mdadm --incremental /dev/sdh1' [311]" "udev[124]: timeout: killing '/sbin/mdadm --detail --export /dev/md0' [316]" I've formated the system disk, hoping to get a system up and running. I did that with all RAID disks disconected, so everything was fine. I then reconnected the disks, wich was also ok. And finally installed mdadm using apt-get. By reboot, the system has found the mdadm intention of growing the system, so the same messages appear again. I other words: I can't even reach a command prompt to do something. Any ideas of what to do? I believe I could turn off the system, disconnect the disks and look for the mdadm.conf file. Would that be a good idead? I'm no Linux expert, so I'm really lost here.

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Application that provides unique keys to multiple threads

- by poly

Thanks all for your help before. So, this is what I came up with so far, the requirements are, application has two or more threads and each thread requires a unique session/transaction ID. is the below considered thread safe? thread 1 will register itself with get_id by sending it's pid thread 2 will do the same then thread 1 & 2 will call the function to get a unique ID function get_id(bool choice/*register thread or get id*/, pid_t pid) { static int pid[15][1]={0};//not sure if this work, anyway considor any it's been set to 0 by any other way than this static int total_threads = 0; static int i = 0; int x=0,y=0; if (choice) // thread registeration part { for(x=0;x<15;x++) { if (pid[x][0]==0); { pid[x][0] = (int) pid; pid[x][1] = (x & pidx[x][1]) << 24;//initiate counter for this PID by shifting x to the 25th bit, it could be any other bit, it's just to set a range. //so the range will be between 0x0000000 and 0x0ffffff, the second one will be 0x1000000 and 0x1ffffff, break; } total_threads++; } } //search if pid exist or not, if yes return transaction id for(x=0;x<15;x++) { if (pid[x][0]==pid); { pid[x][1]++;//put some test here to reset the number to 0 if it reaches 0x0ffffff return pid[x][1]; break; } } }

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CUDA 4.1 Update

- by N0xus

I'm currently working on porting a particle system to update on the GPU via the use of CUDA. With CUDA, I've already passed over the required data I need to the GPU and allocated and copied the date via the host. When I build the project, it all runs fine, but when I run it, the project says I need to allocate my h_position pointer. This pointer is my host pointer and is meant to hold the data. I know I need to pass in the current particle position to the required cudaMemcpy call and they are currently stored in a list with a for loop being created and interated for each particle calling the following line of code: m_particleList[i].positionY = m_particleList[i].positionY - (m_particleList[i].velocity * frameTime * 0.001f); My current host side cuda code looks like this: float* h_position; // Your host pointer. This holds the data (I assume it's already filled with the data.) float* d_position; // Your device pointer, we will allocate and fill this float* d_velocity; float* d_time; int threads_per_block = 128; // You should play with this value int blocks = m_maxParticles/threads_per_block + ( (m_maxParticles%threads_per_block)?1:0 ); const int N = 10; size_t size = N * sizeof(float); cudaMalloc( (void**)&d_position, m_maxParticles * sizeof(float) ); cudaMemcpy( d_position, h_position, m_maxParticles * sizeof(float), cudaMemcpyHostToDevice); Both of which were / can be found inside my UpdateParticle() method. I had originally thought it would be a simple case of changing the h_position variable in the cudaMemcpy to m_particleList[i] but then I get the following error: no suitable conversion function from "ParticleSystemClass::ParticleType" to "const void *" exists I've probably messed up somewhere, but could someone please help fix the issues I'm facing. Everything else seems to running fine, it's just when I try to run the program that certain things hit the fan.

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How do you interpret `strace` on an apache process returning `restart_syscall`?

- by indiehacker

We restart an apache server every day because RAM usage reaches its limit. Though of value See this serverfault answer, I dont think lowering the MaxClients in the apache configuration is a solution to the unknown root problem. Can you make sense out of the below data? Below is an extract of what $top with M returns: 20839 www-data 20 0 1008m 359m 22m S 4 4.8 1:52.61 apache2 20844 www-data 20 0 1008m 358m 22m S 1 4.8 1:51.85 apache2 20842 www-data 20 0 1008m 356m 22m S 1 4.8 1:54.60 apache2 20845 www-data 20 0 944m 353m 22m S 0 4.7 1:51.80 apache2 and then investigating a single process with $sudo strace -p 20839 returns only this one line, which is cryptic, for me: restart_syscall(<... resuming interrupted call ...> <unfinished ...> Any insights? Thanks.

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How Do Computers Work? [closed]

- by Rob P.

This is almost embarrassing ask...I have a degree in Computer Science (and a second one in progress). I've worked as a full-time .NET Developer for nearly five years. I generally seem competent at what I do. But I Don't Know How Computers Work! Please, bare with me for a second. A quick Google of 'How a Computer Works' will yield lots and lots of results, but I struggled to find one that really answered what I'm looking for. I realize this is a huge, huge question, so really, if you can just give me some keywords or some direction. I know there are components....the power supply, the motherboard, ram, CPU, etc...and I get the 'general idea' of what they do. But I really don't understand how you go from a line of code like Console.Readline() in .NET (or Java or C++) and have it actually do stuff. Sure, I'm vaguely aware of MSIL (in the case of .NET), and that some magic happens with the JIT compiler and it turns into native code (I think). I'm told Java is similar, and C++ cuts out the middle step. I've done some mainframe assembly, it was a few years back now. I remember there were some instructions and some CPU registers, and I wrote code....and then some magic happened....and my program would work (or crash). From what I understand, an 'Emulator' would simulate what happens when you call an instruction and it would update the CPU registers; but what makes those instructions work the way they do? Does this turn into an Electronics question and not a 'Computer' question? I'm guessing there isn't any practical reason for me to understand this, but I feel like I should be able to. (Yes, this is what happens when you spend a day with a small child. It takes them about 10 minutes and five iterations of asking 'Why?' for you to realize how much you don't know)

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RequireJS: JavaScript for the Enterprise

- by Geertjan

I made a small introduction to RequireJS via some of the many cool new RequireJS features in NetBeans IDE. I believe RequireJS, and the modularity and encapsulation and loading solutions that it brings, provides the tools needed for creating large JavaScript applications, i.e., enterprise JavaScript applications. &amp;lt;span id=&amp;quot;XinhaEditingPostion&amp;quot;&amp;gt;&amp;lt;/span&amp;gt; (Sorry for the wobbly sound in the above.) An interesting comment by my colleague John Brock on the above: One other advantage that RequireJS brings, is called lazy loading of resources. In your first example, everyone one of those .js files is loaded when the first file is loaded in the browser. By using the require() call in your modules, your application will only load the javascript modules when they are actually needed. It makes for faster startup in large applications. You could show this by showing the libraries that are loaded in the Network Monitor window. So I did as suggested: Click the screenshot to enlarge it and notice how the Network Monitor is helpful in the context of RequireJS troubleshooting.

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Monitor Windows Terminal Sessions from Linux/Mac

- by mhd

I'm writing some scripts to make remote connections to a Windows 2003 server a bit more user-friendly, and in doing this I want to see who's logged in already. In Windows, I could use qwinsta.exe to do this, even for remote servers. So it is exposed somehow, but I couldn't find a matching command line tool for Unix. Lacking such a tool, I could install an ssh server on the machine and call it remotely, parsing the output or write a small service of my own that would expose this via http, if I don't want full-blown ssh access. Do I have to do this, or is there already a tool for querying terminal services remotely?

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Black screen on Windows 7 right after opening Google Sketchup or Minecraft

- by Aero

I get a black screen on Windows 7 right after opening Google Sketchup or Minecraft. I presume there are other applications that cause this too - but I have not tried to open them. The window initially stops responding for a few seconds, before I get a black screen and my Skype call ends abruptly. I have tried waiting for a few minutes but nothing happens. I have to power down my computer and then boot it up again. This is becoming an annoyance, and I don't know what's causing it. Here are my specs, if it helps: My graphics card is an ATI RADEON XPRESS 1100. If you need any more info or if I've missed anything please ask. Thanks :-)

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Exceptions from automongobackup, yet script completes

- by chakram88

I am using automongobackup to, well, automate the backups of mongodb. output from the script (to STDERR) has the following exceptions (but the backup completes, and the dump files are created) ###### WARNING ###### STDERR written to during mongodump execution. The backup probably succeeded, as mongodump sometimes writes to STDERR, but you may wish to scan the error log below: exception: connect failed exception: connect failed exception: connect failed exception: connect failed exception: HostAndPort: bad port # exception: connect failed exception: connect failed exception: connect failed exception: connect failed exception: connect failed exception: connect failed I know that the Host & Port are correct. If I run mongodump --host=127.0.0.1:27017 --journal (which is the effective command from automongobackup based on the options set and my reading of the src code) everything runs clean without any error reporting and the dump files are created as expected. Why would automongobackup report connection errors, even tho it does create the dump files, yet a straight call to mongodump does not? Debian 6.0 Lenny (from Linode image: Latest 3.2 (3.2.1-x86_64-linode23)) AutoMongoBackup VER 0.9 mongodb v 2.0.2

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Can NFS be forced to refresh stale files/directories when not using noac on the mount?

- by johnnycrash

We mount without using noac. I have a file that I append to once every 20 minutes. Then it will be read with mmap about 5,000 times a minute. We only mmap a couple blocks for each read. Needless to say, noac just kills the access performance, so we don't use it. I add data to the end of the file using a mount with noac and read from a mount without noac. The mounts that are reading are not seeing the new data. I want to know if there is a function I can call from c to refresh the attributes of a path and all its files. EDIT: I should add we cannot mount and unmount since there are 16 servers running on each system and they are constantly accessing the files. Well...maybe we could mount and unmount if each server used their own mount. I'd like to avoid that if possible. thanks!

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I can't see wordpress .php file?

- by Alegro

I installed WAMP server on win xp - it works. I installed Wordpress 3.4.2 into www.wordpress - no problem. In Dreamweaver CS5 I created a site with www.wordpress as root folder, and assigned a local test server - ok. In Dreamweaver, I opened twentyten theme - index.php - and pressed F12 to see the page in Firefox - and got: Fatal error: Call to undefined function get_header()... - on line 16 This is a completely new and clear wordpress installation. Why is the function (get_header) - undefined? To check the server I copied another .php file into the same folder - F12 - it works.

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Redirection & SEO related stuff while moving to a new blog

- by Karshim Kanwar

I have a WordPress blog and recently I have setup a new blog lets call the old blog as blog old and new blog as blog new. What I did is moved the content, photos, pictures and all 250 posts from blog old to blog new. Both the blog name are changed as they are pointing to different domain names! I read helpful things in this site itself at here. I will no longer use blog old, moreover I am concerned about the SEO of the blog new. The blog new is fairly new (just 24 hours and no pages have been indexed in Google). I have done the following stuff: Deleted all the post share at Facebook fan Page, Twitter profile, Google+ page and Finally deleted the fan page/Twitter, Google+ page. Edited the link backs of old blog in the blog new. The question I have is: How do I prevent duplicate content issues? Do I go straightaway and delete all the posts in blog old? Should I start sharing the blog posts in blog new? Should I submit the new site to Webmaster Tools or wait for few weeks? Every comment here is appreciated! What issues can I face relating to SEO?

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Drupal migration failed

- by Marco

First of all, I'm new to Drupal and the work I have to do is some kind of too hard. My old colleague (webmaster) had a server with a multisite Drupal 6 installation. Sites and their dirs were (e.g.) Sites Site directory b.a.mycompany.com /drupal_install_dir/sites/b.a.mycompany.com c.a.mycompany.com /drupal_install_dir/sites/c.a.mycompany.com d.a.mycompany.com /drupal_install_dir/sites/d.a.mycompany.com Unluckily my colleague moved and server hdd aren't in my hands: all I have is a backup of /drupal_install_dir and three sql dumps (one for each site). I had to restore three sites, but changing them as z.mycompany.com/b z.mycompany.com/c z.mycompany.com/d Beeing a sysadmin, I Extracted tar.gz backup file under wwwroot (let's call full path to extracted directory /new_install_dir) Restored three databases Created mysql users and give them correct GRANTS on databases Then (trying to restore at least first site) I changed /new_install_dir/sites/settings.php putting correct database connection data and new basepath. But there is no way I can see my new site, simply it doesn't work. Watching /var/log/apache2/error.log I saw Drupal searching for main drupal database; so I created that db too setting user and grants, but dump file is empty. Well, now I can run something like install.php or update.php, but my site is not shown. Is there something I can do? Do I have to walk another way? Consider I searched the web, but I'm not able to find a guide that can help me for my problem. Ah, I forgot: before producing the backup, my colleague set site in maintenance mode. When I try to run z.mycompany.com/?q=user (trying to login) nothing happens. I'm really stuck...

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Can anyone point me to some open source directX rendering engines or frameworks? [on hold]

- by Jim

I'm completely new to graphics API programmming, but not at all new to the theory and principle operation of game engines and rendering engines. That being said, I want to do some experiments of rendering very dense geometry scenes in a basic rendering engine or game engine. I don't need a lot of bells and whistles. What I need is enough control that I can implement my own scene graph algorithms and control the rendering pipeline very specifically. My ideal candidate engine would be either a rendering engine or game engine with a modular design that might be ready to go out of the box but would be simple enough in case I need to rip out some of the guts in the rendering management and implement my own. It's a tough call because I'm right at the level where it's almost better to go from scratch, but there's no sense in having to build every single basic thing such as heirarchical transforms, etc. I just want to work with rendering optimization to push dense geometry for maximum FPS. Does anyone have a suggestion for an engine or basic framework to use? I requested DirectX in my title because I figured it would likely be better supported and less likely for me to run into some obscure less-documented problem. But OpenGL might be acceptable if the recommended framework was definitely better than my other options. EDIT: I should add that I really want GPU tessellation support (part of adding to the density of geometry detail).

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How to put fear of God (law) into Wi-Fi hacking neighbors [closed]

- by Shakehar

I live in an apartment and some new guys have apparently moved into one of the apartments. They have been shamelessly hacking into my WiFi. Mine was initially a WEP encrypted network and out of laziness I just limited and reserved the IPS on my router for the people in my house. Yesterday I had to free up an IP for a guest in my house but before he could join the network these guys connected in. I have changed my encryption to WPA2 and hope they dont have the hardware/patience required to hack into it, but there are many wi-fi networks in my apartment most of which are secured using WEP. I don't really want to call the police on them. Is there any way to deter them from misusing other people's wi-fi ? I have gone through I think someone else has access to my wireless network. What next? but I have already taken the steps mentioned there.

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Android : How to open youtube links on my facebook messenger app, in the youtube app? [migrated]

- by dev_android

I am unable to play YouTube videos from the links I get on my Facebook Messenger app. Here's what happens: A friend of mine posts a video link to me (YouTube link) as a message on Facebook. I receive it on my Android mobile in the Facebook messenger app. I click on it and it shows a Dialogue-Box (you can call that a pop-up) which asks me to choose an app to open the video with. Now earlier, there used to be the video player apps in my mobile along with the internet browsers installed on my mobile that used to come up there. So I would select an internet browser, and it in turn would re-direct me to the "YouTube" app itself. However, now, I am only getting video-players in that Dialogue Box as an option to open the YouTube video, but of course, if I select them, they are not able to stream the video. Has anyone found a way around this problem? It is really bothersome.

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Can't `mount -o loop` an ISO from an NFS share (RHEL)

- by warren

I have a large NFS share with a variety of software ISOs on it. I've only tried this on Red Hat Enterprise Linux, but when trying to do the following, the mount comes back with an error indicating no permissions to mount. Why would this be happening? NFS is mounted thusly: mediaserver:path/to/isos /media/nfs This is the mount call that fails mount -o loop /media/nfs/product.iso /tmp/product If I copy the ISO, there is no issue. The NFS share is mounted rw. How can I loop mount the ISO from the NFS share without copying it first?

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Tracking Protection List in IE9

- by Emanuele Bartolesi

To protect the privacy when I surf over the internet, I use AdBlockPlus add-in for Firefox. But when I use Internet Explorer 9, this add-in don’t work. Internet Explorer 9 (and I hope Internet Explorer 10) has built in feature to add a TPL. There is a javascript function to call named msAddTrackingProtectionList. This function has two parameter: the first one is the link of TPL and the second one is the Title of TPL. To do this is very easy. Add this simple javascript function on your website or in a blank html page. <a href="javascript:window.external.msAddTrackingProtectionList('http://easylist-msie.adblockplus.org/easyprivacy.tpl', 'EasyList Privacy')">EasyPrivacy TPL</a> The effect is below: EasyPrivacy TPL After click appears a confirmation prompt. For security reason this javascript function can only be called from a user interaction: buttons, links, forms. For more information about msAddTrackingProtectionList function go to Msdn Library. For more information about EasyList go to Easy List TPL.

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Windows 7 RDP Fullscreen mode

- by kubal5003

I have a problem with remote desktop connection in Windows 7. When I connect to remote computer I would like to switch to fullscreen like I did in previous versions - just by clicking maximize. When I was in fullscreen mode and I moved the mouse to the upper border of the screen a nice bar appeared and I could minimize rdp or close it. In Windows seven when I click on the maximize button the window maximizes like a normal window - menu start/taskbar(whatever you call it) is still visible and because the resolution of the rdp client desktop is set like on the computer that I'm using it's not fully visible and scrollbars appear. That's really annoying. Can anyone tell me what to do? Is it a bug or maybe there is a "magic shortcut" that is poorly documented and does the trick? (I was trying to find it myself first ofcoz, but no result)

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Is there a way to schedule an automatic WinClone run on my Bootcamp partition?

- by user17873

Hi, I've currently got time machine setup to back up my entire OS X installation. I also have a backup tool within my Bootcamp Windows 7 installation which automatically backs up my windows profile data to an external drive partition. Finally, I'm also backing up my Bootcamp partition weekly and storing on an external drive using WinClone. The final piece I need to complete my external backup process is to have the WinClone application backup my Bootcamp partition automatically once a week rather than having to call it manually and remember. Is this possible?

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MVC and delegation

- by timjver

I am a beginning iOS programmer and use the Model-View-Controller model as a design pattern: my model doesn't know anything about my view (in order to make it compatible with any view), my view doesn't know anything about my model so they interact via my controller. A very usual way for a view to interact with the controller is through delegation: when the user interacts with the app, my view will notify my controller, which can call some methods of my model and update my view, if necessary. However, would it make sense to also make my controller the delegate of my model? I'm not convinced this is the way to go. It could be handy for my model to notify my controller of some process being finished, for example, or to ask for extra input of the user if it doesn't have enough information to complete the task. The downside of this, though, is that my controller would be the delegate for both my controller and my model, so there wouldn't be really a proper way to notify my model of changes in my view, and vice versa. (correct me if I'm wrong.) Conclusion: I don't really think it's a good idea to to have my controller to be the delegate of my model, but just being the delegate of my view would be fine. Is this the way most MVC models handle? Or is there a way to have the controller be the delegate of both the controller and the model, with proper communication between them? Like I said, I'm a beginner, so I want to do such stuff the right way immediately, rather than spending loads of hours on models that won't work anyway. :)

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1 ASPX Page, Multiple Master Pages

- by csmith18119

So recently I had an ASPX page that could be visited by two different user types. User type A would use Master Page 1 and user type B would use Master Page 2. So I put together a proof of concept to see if it was possible to change the MasterPage in code. I found a great article on the Microsoft ASP.net website. Specifying the Master Page Programmatically (C#) by Scott Mitchell So I created a MasterPage call Alternate.Master to act as a generic place holder. I also created a Master1.Master and a Master2.Master. The ASPX page, Default.aspx will use this MasterPage. It will also use the Page_PreInit event to programmatically set the MasterPage. 1: protected void Page_PreInit(object sender, EventArgs e) { 2: var useMasterPage = Request.QueryString["use"]; 3: if (useMasterPage == "1") 4: MasterPageFile = "~/Master1.Master"; 5: else if (useMasterPage == "2") 6: MasterPageFile = "~/Master2.Master"; 7: } In my Default.aspx page I have the following links in the markup: 1: <p> 2: <asp:HyperLink runat="server" ID="cmdMaster1" NavigateUrl="~/Default.aspx?use=1" Text="Use Master Page 1" /> 3: </p> 4: <p> 5: <asp:HyperLink runat="server" ID="cmdMaster2" NavigateUrl="~/Default.aspx?use=2" Text="Use Master Page 2" /> 6: </p> So the basic idea is when a user clicks the HyperLink to use Master Page 1, the default.aspx.cs code behind will set the property MasterPageFile to use Master1.Master. The same goes with the link to use Master Page 2. It worked like a charm! To see the actual code, feel free to download a copy here: Project Name: Skyhook.MultipleMasterPagesWeb http://skyhookprojectviewer.codeplex.com

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what to learn & practice to be a programmer (not for Job) [closed]

- by Hanan N.

I want to be able to write programs (tools) for my own needs, and I want to tell the computer what to do, not to be strict to what other's told it to do. I have a good knowledge of Linux & Windows, I am also have a bit of Python in my head, but I think that I need some guidance on what languages or practices to invest my time into in order to be able to tell the computer what to do. I know there is a lot of posts similar to what I am asking here, but there is a big difference and so I have opened this thread. My goal isn't to work at a company, so I don't need to learn how to work as a team, I don't need to learn as much how to maintain my code nor how to write it nice for others to understand (I know it is important but not for me). I don't want to learn it as a profession, but as a serious hobby (you can call it hacking as long as you know what cracking means), my end goal is to be able to understand other's people code, and to write my own code with a lot of deep knowledge of the ins and outs of the computer system in order to gain from it as much as I can. So in essence my questions are: How can I understand, in depth, computers, in order to exploit them as much as I can? What should I learn? Are there any books that I should read? Is it possible to do this, or do I have to learn every aspect of programming?

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Why doesn't this batch file work for me?

- by asdfg

The following batch file is not woking. @echo off python -c "print('echo text')" %TEMP%\test.bat call %TEMP%\test.bat Can anyone help me with this?. edit: I needed unix eval functionality in windows. I could not find a direct way though. So I redirected the eval string to a temporary batch file and executed it. The temporary batch file was successfully created but calling it did not work in the above case. I noticed that any command after the test.bat creation did not work.

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Solaris 11 installed, no updates?

- by Paul De Niro

I was messing around with solaris and decided to give Solaris 11 a try so I downloaded it from the Oracle website. After installing the OS, I went into the package manager and did an update. It told me that there were to available updates! I find this hard to believe considering that it's running a vulnerable version of firefox and java, its own in-house software product! Many of the other software products that came with the default install are also out of date and vulnerable. Is this normal for an Oracle install, or did I do something wrong with the upgrade process? I typed "pkg update" at the prompt, and I noticed that it did call out to pkg.oracle.com looking for updates. I find it bizarre that there are no updates available for an OS that was released a couple months ago with vulnerable software...

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