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• distributed, fault-tolerant network block device

  - by gucki

  I'm looking for a distributed, fault-tolerant network storage system which exposes block devices (not filesystems) on the clients. A client's block device should write simultaneously to several storage nodes A client's block device should not fail as long as not all storage nodes backing it went down The master should automatically redistribute storages' data when a storage node fails or gets added/ removed A single master (which is for metadata only) is fine So ideally the architecture would be very similar to moosefs (http://www.moosefs.org/) but instead of exposing a real filesystem mounted using a fuse client it'd expose block devices on the clients. I know of iscsi and drbd but both don't seem to offer what I'm looking for. Or am I missing something?

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• Using a KVM with a Sun Ultra 45

  - by Kit Peters

  I have a friend with two machines: a Mac and a Sun Ultra45. He wants to use a single monitor (connected via DVI) and USB keyboard / mouse with both machines. Try as I might, the Sun box will not bring up a console if the KVM is connected. However, if I connect a monitor, keyboard, and mouse directly to the Sun box, it will bring up a console that I can then (IIRC) connect to the KVM. Is there any way I can make the Sun box always bring up a console, regardless of whether it "sees" a monitor, keyboard, and mouse?

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• SSMS Tools Pack 2.5 is out. Added support for SQL Server 2012.

  - by Mladen Prajdic

  Because I wanted to make SSMS Tools Pack as solid as possible for SSMS 2012 there are no new features only bug fixes and speed improvements. I am planning new awesome features for the next version so be on the lookout. The biggest change is that SSMS Tools Pack for SSMS 2012 is no longer free. For previous SSMS versions it is still free. Licensing now offers following options: Per machine license. ($29.99) Perfect if you do all your work from a single machine. This license is valid per major release of SSMS Tools Pack (e.g. v2.x, v3.x, v4.x). Fully transferable license valid for 3 months. ($99.99) Perfect for work across many machines. It's not bound to a machine or an SSMS Tools Pack version. 30 days license. Time based demo license bound to a machine. You can view all the details on the Licensing page. If you want to receive email notifications when new version of SSMS Tools Pack is out you can do that on the Main page or on the Download page. This is also the last version to support SSMS 2005 and 2005 Express. Enjoy it!

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• Z Order in 2D with orthographic projection and texture atlas

  - by Carbon Crystal

  I am working with a 2D game in OpenGL ES and have a question about z-order together with a texture atlas. I am using an orthographic projection because I want pixel-perfect rendering of 2D sprites, however from what I can determine the draw order is really the only thing that will determine which textures (sprites) appear above or below their neighbors. That is, the "z-index" is a function of the order in which the textures are drawn as opposed to the z coordinate on the vertex array being drawn. So.. I have a texture atlas to save binding multiple textures for each draw call but this immediately creates a problem if there is more than one atlas in play. If I need to draw textures from more than one atlas (typically the case if I have too many sprites to fit in a single atlas of a reasonable size), then I can't maintain a "draw order" across atlases unless I want to bind/unbind the atlas textures more than once.. which kinda defeats the purpose. Does anyone have any clues as to what the best approach is here? Currently I'm running under an assumption that I will have to declare different fixed "depths" (e.g foreground, background etc) in my 2D scene and assume that the z-order for sprites at a given depth is the same. Then I can have as many atlases as I need at each depth and simply draw the depths in order (along with their associated atlases) I'd love to hear what other people are doing.

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• Redirect to ADFS login

  - by Patrick

  My company has switched to Office 365 and we like it, but we would really like for the ADFS single sign on to be more simplified. We have to go to login.microsoftonline.com then type in the username, then you have to click the link that appears at the bottom. Then you have to type in your username again and password. So we have come up with the idea that we could just redirect everyone to this page, but after lots of research into this, it seems like it's not possible to do a DNS redirect to a path. Does anyone know any other type of redirect that we could try? I'm thinking about trying to see if I can have a DNS entry go to our TMG and then have the TMG redirect to a path. But I'm not sure how the ADFS server knows where to go after that, so it might just log us in and not go anywhere. Any help will be greatly appreciated.

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• Virtual box - How to add disks and move var, opt and home to them?

  - by Jarrod Roberson

  I created a CentOS 5.6 Guest OS Virtual Machine. I made the first disk 10GB, I am rapidly outgrowing it. It was suggested that I make disks for my /var, /opt and /home directories and move them so I can better manage the disks for backing up and what not. This sounds like a good idea. I know how to create the disks in Virtual Box. I have dug around Google and the internet in general and all my attempts at doing this have failed. Snapshots are awesome! I can get the drives fdisked, and I have had limited success mounting them to /mnt/var, /mnt/home and /mnt/opt, but even in single user mode ( init 1 ) I can't get the entire contents of the directories to move over, and then the machine won't reboot correctly. cd /var cp * -ax /mnt/var The /var directory in particular is not wanting to move everything to the new location. How do I format, mount and move the /var, /opt and /home to my new disks?

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• Best practices for caching search queries

  - by David Esteves

  I am trying to improve performance of my ASP.net Web Api by adding a data cache but I am not sure how exactly to go about it as it seems to be more complex than most caching scenarios. An example is I have a table of Locations and an api to retrieve locations via search, for an autocomplete. /api/location/Londo and the query would be something like SELECT * FROM Locations WHERE Name like 'Londo%' These locations change very infrequently so I would like to cache them to prevent trips to the database for no real reason and improve the response time. Looking at caching options I am using the Windows Azure Appfabric system, the problem is it's just a key/value cache. Since I can only retrieve items based on keys I couldn't actually use it for this scenario as far as Im aware. Is what I am trying to do bad use of a caching system? Should I try looking into NoSql DB which could possibly run as a cache for something like this to improve performance? Should I just cache the entire table/collection in a single key with a specific data structure which could assist with the searching and then do the search upon retrieval of the data?

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• Can a web server and XBMC HTPC co exist happily?

  - by Mild Fuzz

  I have a machine that is currently dedicated to running my home theatre. It is way more powerful than it needs to be, and spec wise would have no problem running both a few websites and an HTPC What I wanted to know is that is this was a reasonable thing to expect of a single machine? 90% of the time, all it's power would be just for the web server ( and the odd torrent) Currently it's running Windows, but I am pretty sure I will have to turn it into a Linux box Will I run into any problems? Is there anything I need to know before I start? Any prerequisites? The webserver will be required to run Ruby on Rails sites mainly, but might be called upon to run PHP for Wordpress also.

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• Reverting problems caused by checkinstall with gcc build

  - by slavik262

  I recently downloaded the GCC 4.6.2 source in order to play around a bit with C++11. Having been told about checkinstall and its usefulness in installing programs from source, I created a Debian package from the install using sudo checkinstall -D make install. Wanting to see how well the newly created package worked, I removed it using Synaptic Package Manager. As it turns out, the package checkinstall created from make install tried to remove every single file the installation process touched, including shared gcc libraries like /lib64/libgcc_s.so. Despite not being able to run a bunch of programs due to this missing dependency, I was able to restore my system back to normal by reinstalling the package from command line using dpkg. At this point I want to remove the package from the package manager since it's so dangerous, but not remove the installed files. I was looking around in /var/lib/dpkg and found that the package manager seems to be based on text files which list packages and such - can I just remove all mention of the package from the files in /var/lib/dpkg, or is there a safer way to go about this?

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• Gateway NE56R & mouse swipe gesture...how to disable?

  - by Anders

  Can anyone tell me how to shut off the swipe gesture mechanism on my computer? It's driving me crazy. I cannot use a single application without having my computer screen minimize every time I move my hand over the mouse following a mouse-click, pointer movement, etc. Having to maximize my spreadsheets, documents, and applications so much is undercutting my productivity. How some software engineer/inventor imagined that this mouse/gesture swipe gimmick would be helpful to computer users is inconceivable to me. It is a massive annoyance. I've found instructions online for disabling this obnoxious feature, but all the instructions involve messing with my registry, which I don't want to do. I will be SO GRATEFUL to any techie who can tell me how to disable this horrible mouse swipe mechanism without having to alter my registry! I'm using a Gateway NE56R Notebook, Windows 7 operating system, and an Inland USB Mouse (model no. 37535). Thank you in advance!

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• database on SSD: data only or the DBM program too?

  - by simone

  I plan on moving the data I use for statistical analysis (100-ish Gb) onto an SSD. The data is either sqlite single-file db's, or postgresql-managed data. The SSD is 240 Gb, 550 MB/s read and 520 MB/s write. Should I reserve that space for the data only, or would it be a good idea to install the operating system (Mac OS X) and the application directory (Adobe Suite, Microsoft Office and the like) on the SSD too? And would it make a substantial speed difference whether I also install the postgresql binaries on the SSD? I have plenty of other space (another 300Gb hard-drive, and a 1Tb one). Don't know the features of the non-SSD drives, though they're our standard equipment on all Macs, and they're definitely OK. Thanks.

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• Traceroutes to every site includes nameintelligence.com

  - by Cyclone

  I used domaintools.com to do a traceroute on a bunch of sites, and noticed that every single one leads to this "nameintelligence.com" site that I have never heard of. Absolutely every site, including this one, google, my own site, yahoo, microsoft.com, stackoverflow, EVERYTHING, has nameintelligence.com in the first position. What is that site, and what do they do? They're a PR 4 apparently, yet I have never heard of them. I think this would be the right place to ask, I am sorry if I am wrong. Here is the traceroute for google: http://dns-tools.domaintools.com/ip-tools/?method=traceroute&query=74.125.53.99

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• Dovecot ignoring maximum number of IMAP connections

  - by Michelle

  I have a single mailbox mail server running Dovecot/Postfix and I have two IMAP clients, Thunderbird on the PC and K9 on Android. I keep on receiving this error in my logs even after I change the 'mail_max_userip_connections' variable to 50. puppet dovecot: imap-login: Maximum number of connections from user+IP exceeded (mail_max_userip_connections=10): user=<[email protected]>, method=PLAIN, rip=62.242.90.2, lip=198.29.31.229, TLS Why does it say that it is set to 10 in the log? Is that hardcoded? grep -r "mail_max_userip_connections" /etc/dovecot /etc/dovecot/conf.d/20-managesieve.conf: #mail_max_userip_connections = 10 /etc/dovecot/conf.d/20-pop3.conf: #mail_max_userip_connections = 3 /etc/dovecot/conf.d/20-imap.conf: mail_max_userip_connections = 50 I've restarted dovecot after making the changes but this error is still logged and I can't access the mailbox. Can anyone help me understand why I can't seem to raise the maximum limit?

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• Ubuntu Nvidia Xorg Twinview doesnt like my monitors

  - by Andrew Bolster

  Basically, using the latest available ubuntu drivers (195.36.15) I cannot for the life of me get my two monitors to operate at suitable resolutions. When not using the drivers atall and going single-screen, both monitors support 1680x1050, but this option is only shown for one monitor in nvidia-settings, and when i manually add a metamode into the xorg.conf, it just gives up initialising the second screen. (**) Mar 25 15:49:47 NVIDIA(0): TwinView enabled (II) Mar 25 15:49:47 NVIDIA(0): Assigned Display Devices: CRT-0, CRT-1 (II) Mar 25 15:49:47 NVIDIA(0): Validated modes: (II) Mar 25 15:49:47 NVIDIA(0): "1680x1050,1680x1050" (II) Mar 25 15:49:47 NVIDIA(0): Virtual screen size determined to be 1680 x 1050 Any ideas?

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• Ubuntu Nvidia Xorg Twinview doesnt like my monitors

  - by Andrew Bolster

  Basically, using the latest available ubuntu drivers (195.36.15) I cannot for the life of me get my two monitors to operate at suitable resolutions. When not using the drivers atall and going single-screen, both monitors support 1680x1050, but this option is only shown for one monitor in nvidia-settings, and when i manually add a metamode into the xorg.conf, it just gives up initialising the second screen. (**) Mar 25 15:49:47 NVIDIA(0): TwinView enabled (II) Mar 25 15:49:47 NVIDIA(0): Assigned Display Devices: CRT-0, CRT-1 (II) Mar 25 15:49:47 NVIDIA(0): Validated modes: (II) Mar 25 15:49:47 NVIDIA(0): "1680x1050,1680x1050" (II) Mar 25 15:49:47 NVIDIA(0): Virtual screen size determined to be 1680 x 1050 Any ideas?

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• Does command/query separation apply to a method that creates an object and returns its ID?

  - by Gilles

  Let's pretend we have a service that calls a business process. This process will call on the data layer to create an object of type A in the database. Afterwards we need to call again on another class of the data layer to create an instance of type B in the database. We need to pass some information about A for a foreign key. In the first method we create an object (modify state) and return it's ID (query) in a single method. In the second method we have two methods, one (createA) for the save and the other (getId) for the query. public void FirstMethod(Info info) { var id = firstRepository.createA(info); secondRepository.createB(id); } public void SecondMethod(Info info) { firstRepository.createA(info); var key = firstRepository.getID(info); secondRepository.createB(key); } From my understanding the second method follows command query separation more fully. But I find it wasteful and counter-intuitive to query the database to get the object we have just created. How do you reconcile CQS with such a scenario? Does only the second method follow CQS and if so is it preferable to use it in this case?

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• Virtual NIC on VM couldn't ping externally after Vmotion

  - by ToreTrygg

  Today I vmotioned 5 MS SQL 2005 servers over to a new DRS Cluster. All SQL servers use the "Production_LAN" network and a single virtual NIC of type "VMXNET 3". The first 4 SQL VM (Windows 2003 Standard or Enterprise x32 bit) vmotioned over without a hitch. The last SQL VM I vmotioned (Windows 2003 Standard x64 bit R2) vmotioned over without error, but I upon completion, I could no longer ping the VM. I went into the VM and could not even ping the gateway, however I could ping the loopback. This SQL server is extremely busy in comparison with the previous 4 VM's. I restarted the server and it came back up with the virtual nic working just fine. The build of both servers (vmotioner and vmotionee) is ESX 4.0.0 175625 - So, pre-update 1. Should I suspect the network switch/VM for possibly not updating the mac table on the switch? Anybody else ever have this issue or know what may have caused it? Thank you!

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• How to copy files pointed to (not the shortcut files themselves)

  - by Ivo Bosticky

  I have a folder containing shortcuts that point to files that are located in various directories and drives. I would like to copy the files pointed to (NOT the shortcut files themselves) to a single destination folder. Is there a way in windows (XP, Vista, 7), file manager, or some utility I can use to do this? I've heard you can do this with various multi-step custom scripts. However, I've heard rumors there is a one click way to do this without having to fabricate a custom script each time, where regardless where the shortcuts point to, I can select the group of shortcuts and do a copy operation that will grab the files they point to. Then, I can paste or otherwise put the actual files (not shortcuts) into one directory. It would be very time consuming to manually find each file pointed to by a shortcut and one by one copy them to the target folder. Note that I've seen this question asked before on the internet but haven't seen a good answer.

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• Database modularity with EBS volumes

  - by Eclyps19

  I would like to add modularity to my websites on EC2 instances by encapsulating the site files and the mysql files in their own EBS volumes. The end result that I'm going for is the ability to quickly mount a volume or two to different servers running the same AMI (for testing/development/emergency maintenance, etc), as well as maintain separate snapshots of each. I'm able to do this fairly easily with a single database by symlinking my mounted database EBS to the appropriate places (/var/lib/mysql, /etc/my.cnf, /var/log/mysqld.log), but I'm not sure if it would even be possible be possible to have multiple databases on different EBS volumes running concurrently. Example: /website1/www.website.com /database1/ /website2/www.otherwebsite.com /database2/ Could anybody shed some light on this for me? Is it possible? Is it a bad idea? Thanks.

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• Building a Redundant / Distrubuted Application

  - by MattW

  This is more of a "point me in the right direction" question. I (and my team of 3) have built a hosted web app that queues and routes customer chat requests to available customer service agents (It does other things as well, but this is enough background to illustrate the issue). The basic dev architecture today is: a single page ajax web UI (ASP.NET MVC) with floating chat windows (think Gmail) a backend Windows service to queue and route the chat requests this service also logs the chats, calculates service levels, etc a Comet server product that routes data between the web frontend and the backend Windows service this also helps us detect which Agents are still connected (online) And our hardware architecture today is: 2 servers to host the web UI portion of the application a load balancer to route requests to the 2 different web app servers a third server to host the SQL Server DB and the backend Windows service responsible for queuing / delivering chats So as it stands today, one of the web app servers could go down and we would be ok. However, if something would happen to the SQL Server / Windows Service server we would be boned. My question - how can I make this backend Windows service logic be able to be spread across multiple machines (distributed)? The Windows service is written to accept requests from the Comet server, check for available Agents, and route the chat to those agents. How can I make this more distributed? How can I make it so that I can distribute the work of the backend Windows service can be spread across multiple machines for redundancy and uptime purposes? Will I need to re-write it with distributed computing in mind? I should also note that I am hosting all of this on Rackspace Cloud instances - so maybe it is something I should be less concerned about? Thanks in advance for any help!

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• OpenGL CPU vs. GPU

  - by Nitrex88

  So I've always been under the impression that doing work on the GPU is always faster than on the CPU. Because of this, in OpenGL, I usually try to do intensive tasks in shaders so they get the speed boost from the GPU. However, now I'm starting to realize that some things simply work better on the CPU and actually perform worse on the GPU (particularly when a geometry shader is involved). For example, in a recent project I did involving procedurally generated terrain, I tried passing a grid of single triangles into a geometry shader, and tesselated each of these triangles into quads with 400 vertices whose height was determined by a noise function. This worked fine, and looked great, but easily maxed out the GPU with only 25 base triangles and caused a very slow framerate. I then discovered that tesselating on the CPU instead, and setting the height (using noise function) in the vertex shader was actually faster! This prompted me to question the benefits of using the GPU as much as possible... So, I was wondering if someone could describe the general pros and cons of using the GPU vs CPU for intensive graphics tasks. I know this mainly comes down to what your trying to achieve, so if necessary, use the above scenario to discuss why the "CPU + vertex shader" was actually faster than doing everything in the geometry shader on the GPU. It's possible my hardware (newest macbook pro) isn't optomized well for the geometry shader (thus causing the slow framerate). Also, I read that the vertex shader is very good with parallelism, and would love a quick explanation of how this may have played a role in speeding up my procedural terrain. Any info/advice about CPU/GPU/shaders would be awesome!

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• TFS2010 Build Controllers

  - by Kabir Rao

  As I know, In TFS2010, One Build Controller serves One Project Collection. And, ideally one build server should have One build controller into it. However, as per the link below- http://marknic.com/2010/05/14/MultipleTFS2010BuildControllersOnASingleBuildBox.aspx we can install mutiple build controller in a single build box. Can two or more build controller can run at a same time. Because the link suggests that, we need to switch between controllers .... Is it that, we can use one controller at a time.

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• How to manage focus for a small set of simple widgets

  - by Christoph

  I'm developing a set of simple widgets for a small (128x128) display. For example I'd like to have a main screen with an overlay menu which I can use to toggle visibilty of main screen elements. Each option would be an icon with a box around it while it is selected. Button (left, up, right, down, enter) events should be given to the widget that has "focus". Focus is a simple thing to understand when using a GUI, but I'm having trouble implementing this. Can you suggest a simple concept for managing focus and input events? I have these simple ideas: Only one widget can have focus, so I need a single pointer to that widget. When this widget gets some kind of "cycle" input (as in "highlight the next item in this list"), the focus is given to a different widget. a widget must have a way of telling the application which widget the focus is given to next. if a widget cannot give a "next focus" hint, the application must be able to figure out where the focus should go. Widgets are currently structured like this: A widget can have a parent, which is passed to the constructor. Widgets are created statically, as I want to avoid dynamic memory allocation (I only have 16kB of RAM and I'd like to have control over that). widgets have siblings, implemented as an intrusive linked list (they have a next member). A parent has a pointer to the head of its list of children. Input events are arguments to the widgets buttonEvent methods which can accept or ignore that event. If it ignores the event, it can pass the event to its parent. My Questions: How can I manage focus for these widgets? Am I making this too complicated?

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• It it possible to have multiple ReWrite rules that all do the same Action, for an IIS7.5 webserver?

  - by Pure.Krome

  I've got rewrite module working great for my IIS7.5 site. Now, I wish to add a number of urls that all goto an HTTP 410-Gone status. Eg. <rule name="Old Site = image1" patternSyntax="ExactMatch" stopProcessing="true"> <match url="image/loading_large.gif"/> <match url="image/aaa.gif"/> <match url="image/bbb.gif"/> <match url="image/ccc.gif"/> <action type="CustomResponse" statusCode="410" statusReason="Gone" statusDescription="The requested resource is no longer available" /> </rule> but that's invalid - the website doesn't start saying there's a rewrite config error. Is there another way I can do this? I don't particularly want define a single URL and ACTION for each url.

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• Getting .deb package dependencies for an offline Ubuntu computer through Windows

  - by user109500

  Basically I want to "batch" download a .deb file and all its dependencies at once on a Windows 7 machine (of which I do not have admin access, it is a public computer.) I've seen plenty of Ubuntu based fixes that require terminal and apt, I'm asking how to do this on Windows. (I am not sure if this question fits here but I haven't found anywhere else that it could go.) I've tried Keryx and Sushi-huh to try to get packages and their dependencies but these both require Python, Python can't be normally installed without admin permission. (Side note, I think I've seen programs bundle python so they can work without installing it to c:, is this possible as a workaround? Google isn't helping) If anyone wants to know I'm trying to download Krita and Blender for Ubuntu 12.10/AMD64 I have been able to manually download single .deb files and dependencies upwards to 38 dependent packages, but then those 38 packages depend on other packages, It's maddening to not have some way to automatically do this on Windows. *Edit Sorry I forgot to make it clear that my personal home computer is running Ubuntu 12.10 and the public computer I'm using to download is Windows 7

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