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• Mongodump on Gridfs is killing the host IOs

  - by Raphael

  I'm trying to make a mongodump from our production mongodb while the production is running. We have three production instances, one regular mongodb, one with very few gb of data on gridfs, one with a larger amount of data on gridfs. All mongodb instances are running in version 2.4.9 on a ubuntu 10.04 virtual server. I use a mongodump command to export the bases to another server. Unfortunately our machines are virtually hosted in a "low performances" datacenter (vmware based) so when I try to export the large gridfs db, the disk IO hits 100% (and 50% of the cpu starts waiting for IO too). This has a very negative impact on the production applicatiosn because db access time is excessively increased, making the applications unusable. I'm looking for a way to regulate the mongodump so the export goes slower but cooler on the hardware ressources allowing better performances for the applications to run. Has anyone had a similar scenario ?

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• How to tell if OpenGL is really working in Ubuntu 10.04

  - by Jonathan

  I have a lenovo S9e running Intel integrated graphics. Here is my lspci output related to the graphics: 00:02.1 Display controller: Intel Corporation Mobile 945GM/GMS/GME, 943/940GML Express Integrated Graphics Controller (rev 03) Subsystem: Lenovo Device 3870 Flags: bus master, fast devsel, latency 0 Memory at f0580000 (32-bit, non-prefetchable) [size=512K] Capabilities: [d0] Power Management version 2 I want to know how I can make sure OpenGL support is running in full on an Ubuntu 10.04 installation. I have a few hints to think that it is not: The "Desktop Effects" will not load Apps such as stardock, when attempting to use OpenGL rendering, will display black boxes instead of transparency In the games Pioneers, the number-tile icons are suspiciously just black circles Windows games running with Wine will only support software rendering, not hardware rendering When I boot into a Knoppix LiveCD, the desktop effects do work, splendidly, meaning compiz detects my computer as capable. My problem with troubleshooting is that Canonical has basically eliminated the conf-file-based mechanism of X11 as far as I can tell, thus making it even harder to ensure graphics modules are loading properly. How do I debug and test OpenGL on m Ubuntu 10.04 installation?

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• How to get access to console to reset Cisco 3750?

  - by genehack

  I acquired two Cisco 3750 switches from another part of my organization. I was able to complete the standard password/config reset procedure on one without any issues -- boot it, put it into express config mode, telnet in, reset the passwords, etc. The second one doesn't ever boot to the point where it displays anything on the console. When power cycled, the 'SYST' light flashes green a few times, then comes on a solid green and stays lit. None of the other lights ever flash or light up. Holding down the 'MODE' button for up to 30 seconds produces no noticeable effects. Nothing ever comes out on the console. Since I was able to configure the first one without any problems, I know my connectinon is good -- console port configured right, good cable, etc. Is this just a hardware problem with the switch? Is there any way I can recover from this and get the switch back into a state where I can configure it?

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• Quad Core host with hyper-threading, how many processors to configure in VirtualBox?

  - by Anthony

  I have a quad-core i7 processor with hyperthreading (8 logical cores), when I configured a virtual machine to use 8 processors, VirtualBox gave me a warning saying that I only have four cores (which is true) and that this may cause a performance issue. But hyper-threading is a hardware feature, so the OS sees 8 cores and it sends instructions to all 8. What if setting it to 4 caused the VM to use 2 cores (4 threads) instead of 4 simultaneous threads (on all 4 cores)? Does the warning I got take into account that my machine has hyper-threading?

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• TV video constantly skips 1/2 second, plays 1 second; green on bottom

  - by Robert

  I just got DirecTV. It worked for a day, but now the TV video constantly skips 1/2 second, then plays 1 second. Also, the bottom 5th of the screen is solid green. The audio does not skip. I tried to do "Set up TV signal" (in Media Center) - but I get an error. See the post I just made here titled "Error - “IR Hardware not detected” - but it’s installed/working." Thanks for your help.

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• MSTSC Not working, disconnects shortly after connecting

  - by F4r-20

  I'm currently having a problem connecting remotely to a server. It is a brand new build Windows 2008 R2, remote users are enabled. I'm trying to connect from a Windows 7 machine. Everytime I remotely connect to the server it will stay connected for a matter of seconds (maybe 3-5) and then disconnect and I get the standard old cannot connect and list of reasons it could be. Then I cannot connect again and get this prompt until I restart the server. As soon as it's finished restarting, it happens all over again. The network and hardware configuration between the two machines is completely reliable. Does anybody know what else I could try? Thanks.

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• How to make phone calls using a pc, modem, headphone and no actual phone instrument

  - by user18151

  Hi, I have a phone landline connection and I DO NOT have a phone instrument. I connect the cable into my laptop, and want to make calls using my laptop. I have an HDA CX20561 modem. I seem to be able to dial number using dialer.exe, though nothing seems to happen. From Microsoft kb http://support.microsoft.com/kb/958143, it looks like dialer.exe alone is not enough for the call. Can somebody tell me how to make and receive phone call with whatever hardware I have, i.e. what software will I need. Thanks.

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• Where should I go to learn about networking? [closed]

  - by Ollie Saunders

  I wonder if anyone could recommend resource or resources such as a good book that: explains how all the important protocols work and interact. I’m interested in those that are relevant in a typical home network and used over the Internet explains in detail how ADSL Internet connections work to the level of depth necessary so that I’m able to tweak and measure performance settings starts from the beginning but attempts to provide proper understanding rather than idiot-oriented steps to follow Basically, I’m interested in how these technologies work and tend to be implemented in hardware and software rather than “here’s what to do if…” I’m interested in Computer Networking by Andrew S. Tanenbaum and I wonder if anyone else has any experience with that title. It’s expensive but I could probably loan a copy for £3 from the library or so.

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• Is there a way to enable metro on a 1024x600 netbook?

  - by scatmoi

  Windows 8 Consumer Preview works great on my 1024x600 netbook but, for some strange reason, Microsoft decided to provide its Metro interface only to 1024x768 and up screens. "Strange" because Android can work with as little as 240x320 screens, and I know that Microsoft is presumably targeting smartphones, too, in its upcoming Windows 8. The interface itself is there with all the panels etc. but when one of the rectangles is pressed, Windows 8 just refuses to launch any application (even Internet Explorer), except for Windows Explorer. Looks to me like this isn't a real hardware limitation but some arbitrary flag set in the registry. Is there any way or tweak to enable the Metro interface on 1024x600 screen?

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• Cannot assign port 4 to WAN on TP-Link WR740N by DD-WRT wiki

  - by Victor Sergienko

  I'm following the DD-WRT instruction to get TP-Link WR740N v3's Port 4 on a different VLAN, but this doesn't happen. First, I have no "Setup VLANs" settinngs tab in DD-WRT v24-sp2 (07/20/12) std r19519. I can get Internet on Wi-Fi if assigning eth1 to "WAN Port", but then all Ethernet ports get on the same VLAN and any wired connection grabs the DHCP address and Internet connection from router. When following the "old" instruction, if I run, say, nvram set vlan2ports="2 5*", should there appear a new interface, vlan2, in ifconfig, after ifconfig vlan2 up? It doesn't - does it mean there is no support for different VLANs in my software/hardware? What am I missing? Is it impossible to create more VLANs on TP-Link740?

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• XP Mode under Win 7 Professional: Windows Activation Update failure despite activated Windows

  - by Cristina

  I am trying to install Windows XP Mode from here: http://www.microsoft.com/windows/virtual-pc/download.aspx (the Hardware-Assisted Virtualization Detection Tool has given me the green for proceeding) Even though my Windows has been activated a year or so ago, the download button leads me to a splash screen saying "Windows validation required". I am next forced to download a WindowsActivationUpdate.exe which, after downloading some mysterious "update", fails with the error message "Update installation failed, error information 0x80070002" (rough translation from German). I've tried running it both normally and as Administrator. What could be the problem?

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• Why Standards Place Limits on Data Transfer Rates?

  - by Mehrdad

  This is a rather general question about hardware and standards in general: Why do they place limits on data transfer rates, and disallow manufacturers from exceeding those rates? (E.g. 100 Mbit/s for Wireless G, 150 Mbit/s for Wireless N, ...) Why not allow for some sort of handshake protocol, whereby the devices being connected agree upon the maximum throughput that they each support, and use that value instead? Why does there have to be a hard-coded limit, which would require a new standard for every single improvement to a data rate?

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• Difference between tc qdisc and netdev_max_backlog

  - by Mediocre Gopher

  I'm wondering what the difference between these two things on linux is. According to the docs tc qdisc can be used to set the queue size for egress and ingress packets coming in and out of the NIC (or that's how I understood it). But from what I understand netdev_max_backlog can also be used to set this. If I were to set both of them which would be used? Or are there actually two queues that are being manipulated in this case? If there are two queues, which queue is above the other (if the application is at the top and the hardware at the bottom)?

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• How can I to take an HDMI TV broadcast and overlay text in real time?

  - by ObligatoryMoniker

  Our company wants to be able to have LCD TVs displaying TV with the ability to add an overlay, like a stock ticker at the bottom of the screen, where human resources can add content to be displayed. I have been trying to nail down the correct terminology for this and come across terms like Keying, Compositing, Live Broadcast Graphics Presentation, and Hardware Overlay but I don't know which of these terms is truly the correct way to refer to what I am trying to do. Black Magic offers a product that seems like it can do what I am looking for but their product seems like it is geared for a totally different purpose than what I would be using it for. Compix also seems to have a product that would do what I need but again it seems like killing a fly with a sledge hammer. How can I to take an HDMI TV broadcast and overlay arbitrary content in real time?

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• BSOD constantly with same ntoskrnl.exe error and disk indicator is frozen

  - by Sheep

  BSOD constantly and the disk indicator is frozen. Error do not happen immediately, usually an hour after boot up. Here is the Minidump: Bug Check Code = 0x00000124 Caused By Driver = ntoskrnl.exe Caused By Address = ntoskrnl.exe+4b094c Crash Address = ntoskrnl.exe+4b094c Seems to be hardware problem, but I checked RAM, no error. I have two HDs installed, system is on SSD, data is on HDD. Checked SSD with the properties-tools-error-checking , no error. Re-installed several times, still happens even after removed HDD. Configuration: SSD: Crucial M4-CT064M4SSD2 with Firmware 0009 Intel HM65 CPU: i7-2630QM The SSD is set correctly, SATA III 6Gb/s enabled, and everything worked perfectly for nearly a year.

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• Routing Essentials

  - by zharvey

  I'm a programmer trying to fill a big hole in my understanding of networking basics. I've been reading a good book (Networking Bible by Sosinki) but I have been finding that there is a lot of "assumed" information contained, where terms/concepts are thrown at the reader without a proper introduction to them. I understand that a "route" is a path through a network. But I am struggling with visualizing some routing-based concepts. Namely: How do routes actually manifest themselves in the hardware? Are they just a list of IP addresses that get computed at the network layer, and then executed by the transport? What kind of data exists in a so-caleld routing table? Is a routing-table just the mechanism for holding these lists of IP address (read above)? What are the performance pros/cons for having a static route, as opposed to a dynamic route?

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• Color Calibrate Dual Monitor XP SP2

  - by Laramie

  This topic has been touched on before but not really answered. I have a dual monitor system and the colors differ wildly. I currently live Buenos Aires where color correction hardware costs premium prices. I do some graphic design, but don't require a pro-level calibration. That said, I'd like my monitors to be set as close to "true color" as possible. I've located the useful and free Monitor Calibration Wizard, but it seems to adjust the entire system internally at startup. I could use the Microsoft Color Control Panel Applet to set a different ICC or ICM profile for each monitor, but the Monitor Calibration Wizard outputs its own format for profiles.

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• What would happen if I did a "Boot to VHD" to a VHD that was configured to run under Hyper-V?

  - by tbone

  Microsoft has a Hyper-V based VM I'm interested in running, however, I don't have access to a Windows Server 2008 machine to try it on, only a Windows 7 Pro x64 machine (Windows 7 does not support Hyper-V). This is the VM in question: This download contains three Windows Server 2008 R2 SP1 Hyper-V Virtual Machine set for evaluating and demonstrating Office 2010, SharePoint 2010 and Project Server 2010. 2010 Information Worker Demonstration and Evaluation Virtual Machine (SP1) http://www.microsoft.com/en-us/download/details.aspx?displaylang=en&id=27417 I came across a somewhat relevant article from Scott Hanselman: Less Virtual, More Machine - Windows 7 and the magic of Boot to VHD: http://www.hanselman.com/blog/LessVirtualMoreMachineWindows7AndTheMagicOfBootToVHD.aspx I realize other options are to convert this VM to a VMWare compatible VM or some of the options to run it under VirtualBox. But instead of those routes, I'm wondering: What would happen if I tried to go the "Boot to VHD" route using this Hyper-V VHD? Is it possible that during the boot process, Windows would simply notice that hardware had changed and adjust accordingly, installing the appropriate drivers and continuing on without a hitch?

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• Speeding up Connection Between Computer and Wireless/Bridged Router

  - by Justian Meyer

  Hey everyone, I looked through other questions, but didn't find useful responses. Our main computer has a dl speed of 6 Mbps, but some of our other computers are getting only 40-200 Kb! The router is wireless, but all computers are connected using a Netgear Wall-Plugged Bridge XE102, which transmits information via the building's powerline. It can't be the hardware itself, however, because some computers still manage decent speeds. The computers afflicted are running on Microsoft XP Service Packs 2 and 3, but so are computers that are totally functional. These speeds severely impede on productivity and are excruciatingly frustrating when trying to cram in time in the early hours. Could it be an issue with the computer? Location? Router? Many thanks in advance, Justian

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• How to solve my black screen at boot?

  - by Juanillo

  I've got a friend with a weird problem. When he starts his computer the screen is completely black until the computer is completely started. So the screen is black until it suddenly shows the Windows desktop. He said that this is happening since a technical service repaired his computer, but that repair is not now in warranty. Recently the computer stopped working, but as the screen is black he cannot access to BIOS or start in safe mode (by pressing F8). When he inserts the Windows Vista DVD the system doesn't boot from DVD (it mustn't be configured in this way in the BIOS). Maybe there´s a problem with the hardware (maybe the graphic card)? Can anyone explain a reason why the screen is black during start-up? Any idea of what to do with the computer to restore it?

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• Single device that can work as tablet and as desktop PC

  - by flow

  I have a macbook pro and an iPad 2. I tried to use iPad 2 for work when I am out of the office but this is not very comfortable since one has to sync documents, not all Os X Lion apps exist for iPad 2 and so on. I think a solution would be a single tablet device that at the office can be connected to some dock station and then I have the equivalent of my macbook, but when I am out of the office I can touch the screen and used the same applications while on the road. As far as I know the iPad 2 does not and will not allow this. Therefore I wonder if you could recommend me another hardware/tablet/etc that could work this way now as of March 2012.

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• Strange noise from my laptop when it is closed

  - by gotqn

  I am fan of powerfull PCs with huge wide screen monitors but I have bought an laptop as gift to my parents. This is the description: "second-handed" lenovo (and there is a sign "ThinkPad" Intel Core Duo CPU T6570 2.10 GHz 64 bits Windows 7 Ultimate and the issue is that when the laptop is turn on and then closed, after a interval of time (I am not sure how much exactly but I believe it is several hours) a strange noise come from the laptop. The noise is something like a "start-up" noise of old computers. I first thought this is some hardware issue but everything seems to work fine. Has anyone an idea what can cause this type of noise or a what can I do in order to track the problem down? I am not sure if this is a important thing, but the laptop is always connected to the power. Note: I have just noticed that the sound is generated again when the laptop is closed and then opened. Note: This is link to the audio - http://yourlisten.com/channel/content/16934332/WindowsStrangeNoise

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• Should I quit using Ifconfig?

  - by Zhen

  With the servers that mount Infiniband cards, when I use the ifconfig command I have the warning: Ifconfig uses the ioctl access method to get the full address information, which limits hardware addresses to 8 bytes. Because Infiniband address has 20 bytes, only the first 8 bytes are displayed correctly. Ifconfig is obsolete! For replacement check ip. Should I quit using ifconfig? It is deprecated in favor of ip command? Or it will be update in the near future.

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• ATI Radeon HD 5970 Display numbering issues

  - by Arindam Sen

  I have 2 computers on which i have ATI Radeon HD 5970 graphics card installed. There is 1 VGA out and 1 DVI out in it. When I connect my VGA out to a monitor on my 1st computer, it shows it as display 1 and when I connect my DVI out to a monitor it show it as display 2 (I am using extended display). When I do the same thing on my 2nd computer it shows just the opposite. The VGA out shows as display 2 and the DVI out shows as display 1. Is it a problem with the drivers or the hardware? (because the graphics card on both is exactly the same)

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• emacs and putty on windows 7

  - by twilbrand

  My workstation was recently updated to Windows 7. I've downloaded putty and have configured it to the same settings I had under Vista. Whenever I ssh to a vm running Centos 5.4 and try to run emacs on a file, I'm getting an error about a connection to an X server: [ecto1 ~]$ emacs foo.bar Connection lost to X server `localhost:10.0' I never received this error message when I had Vista. I can get around it by aliasing emacs to 'emacs -nw', but I don't feel that I should have to do this. My co-worker has the same hardware that had the same upgrade and his sessions do not seem to be doing this. Any advice? I can't find anything on google and don't know where else to start. [ecto1 ~]$ emacs -version GNU Emacs 21.4.1

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