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• System File Checker vs Service Pack Reinstall

  - by Nixphoe

  When trying to repair slow workstations, I've found that running sfc /scannow helps quite a lot in a few of my environments running really old computers. I've also seen recommendations of reinstalling the last service pack after software installation to help keep the system stable. That makes sense as it would replace a lot of the dll files with the ones that would come with the service pack. They both seem to do the same thing, but SFC some times will ask for a disk, where the Service Pack will not. What is the main difference between the two?

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• Turning a running Linux system into a KVM instance on another machine

  - by Charles

  I have two physical machines that I wish to virtualize. I can not (physically) plug the hard drives from either machine into the new machine that will act as their VM host, so I think that copying the entire structure of the system over using dd is out of the question. How can I best go about migrating these machines from their hardware to the KVM environment? I've set up empty, unformatted LVM logical volumes to host their filesystems, with the understanding that giving the VMs a real partition to work with achieves higher performance than sticking an image on the filesystem. Would I be better off creating new OS installs and rsyncing the differences over? FWIW, the two machines to be VM'd are running CentOS 5, and the host machine is running Ubuntu Server 10.04 for no particularly important reason. I doubt this matters too much, as it's still going to be KVM and libvert that matter.

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• Ubuntu freezes while working

  - by webid4me

  Ubuntu on my laptop has frozen multiple times in last 6-7 months. Its not frequent but I can not relate the freezing to anything which I was doing. Today it froze again when I was taking notes in class - approximately at 12:00 PM. During the freeze both mouse and keyboard stopped working. I tried Alt-Ctrl-F1, Alt-Ctrl-F2 etc without any success. After that I waited few minutes & then I restarted the laptop. I checked /var/log/syslog and /var/log/kern.log and it seems that it did not log anything (I was not able to understand most of it). Please let me know if you can find something unusual at around 12:00 PM. Is there any other log which might be useful? Here are the /var/log/syslog and /var/log/kern.log files.

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• Basic Weight Questions with HAProxy

  - by Kyle Brandt

  Do weights assigned to servers only effect the balance within that particular backend? When implementing weights for the first time, if I give all the servers in a backend the same number, would that be the same as before when there we no weights? How do I calculate just how much traffic I am shiffting by adjust weights by certain amounts. For example: server web1 10.10.10.10 weight 100 server web2 10.10.10.11 weight 100 server web3 10.10.10.12 weight 90 server web4 10.10.10.13 weight 90

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• We are moving to two servers from one server due to performance issues. How do we monitor the value of this change?

  - by MikeN

  We are moving to two servers from one server due to performance issues. We are moving our MySQL DB to its own dedicated server and will keep the original machine as the front end machine running nginx/apache (Django backend.) How do we monitor the value of this change? It is possible our whole site could actually get slower since the MySQL queries will be going out over a secure remote connection instead of locally?

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• Minimal backup for Windows 7 system recovery [migrated]

  - by JIm

  There might not be an answer to this, but for a home Win7 system, what files/directories must be backed up to recover after a windows crash? I can reinstall software, and I keep data files elsewhere. When I use acronis home backup software to backup my "critical" files it seems to choose the entire partition. Updates are mostly browser cache files and the like. Or, after a crash, should I just reinstall windows. I dread the hours of windows updates that would require. Thanks.

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• linux system problem

  - by snakec

  very first thanks to u all for Ur support. I'm quite new to Linux .i know how to install software but i don't know 1: how to install library .a or .so files i: how to install tar.gz i use the method like ./configure. make make install but most of the time i got the message nothing to make .in lots of tar.gz there is no installation document no make file no .configure file that make me quite confused how to install them or run them now i got sample source code of cuda i got them in tar.gz form when i extract them i found a folder in folder i found folder like c ,doc,shared etc when i open each folder i found more folder n file like that src, doc common ,lib, in these folder i found source code file header files libraries file make files i don't know how to run this kind of project can the be installed on the system how to run them they don't have .run file or script they don't have configure file can any one explain me how to compile them ,how to run them & how to install them

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• Hard drive self monitoring system

  - by Hoorayo

  I have a 500GB HDD on my desktop, and there are two partitions as C and D. The computer would not start and shows me a error message. Notice - Hard drive self monitoring system has reported that a parameter has exceeded its normal operating range. Dell recommends you that you back up your data regularly. A parameter out of range may or may not indicate a potential hard. So I took the hdd out of the desktop and made a USB external HDD. My laptop recognizes the hard drive as “I” drive and “J” drive. I am able to click “J” and see folders and files. But there is no response when I click “I” while it makes weird clicking sound. Can anyone explain why I drive doesn't work while J drive works on same physical hard drive? Is there anyway that I can fix?

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• Open source Entity-Component game [on hold]

  - by Papavoikos

  I've been reading a lot about entity-component design but every article talks about the philosophy behind such design, leaving a lot of details and implementations outside. I'm looking for an open source game that uses the entity-component design so I can study the concrete implementations and see how they deal with things such as How (and if) they deal with inter-component communication How much logic each component has or doesn't have How a subsystem can change it's behavior depending on an entity's state (the screen darkens depending on the player's health)

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• Enterprise Data Center System Admin/Engineer to Server Ratio

  - by Bob

  I know there have been similar questions asked over the last few months however looking at a Data Center Operations and know there are some really smart people out there that might be able to help. Looking for some staffing best practices based on first hand experience and was hoping that there is some experience in this area that can provide "best practice" application: Three High Availability (99.99% plus) Enterprise Level Data Centers geographically dislocated, one manned 24x7x365, one lights out, one co-location running HOT-HOT-HOT supporting a global community. More than 2,000 operating systems consisting of 95% Windows, 5% Linux and Solaris, 45% virtualized, more than 100TB storage. No desktop support, no Network Administration (administrated separately), running N+1 and serving more than 250 Billion page views annually. Based on experience what has been your experience with Server to "Data Center System Administrator/Engineer" ratio? Thanks in advance for your responses.

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• Low Level Software and Devices

  - by user271619

  I'm looking at a new chapter in my career. I'm a web developer, but now I'm starting to play around with C, compilers, and things I didn't have to work with before. It's all very intriguing! As I'm getting more and more into the "lower level" arena, I'm wondering how devices (mice, printers, webcams, microphones, etc...) are controlled, managed, detected, or used in general with software. I ask because I'm really having a hard time finding straightforward documentation online describing or giving examples of how hardware interacts with software. Does someone know of decent sites that can get me started learning this?

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• sticky bit on NFS file system

  - by Kris_R

  I have a system where to the main server (homes, nfs, ntp, queue...) can log-in only root – all the other users use front-end host with NFS-mounted home directories (RW) and all other software directories (read-only). My problem is, that time to time, if root or normal user with sudo makes some administrative works on front-end some homes of normal users getting sticky bits (drwsr-sr-x). If it happens usually the user can't log-in (as long as permission for his home are not changed to drwxr-xr-x). The last time I saw it after compiling some new software (normal user configure;make) and installation from the same directory as root (su and make install or direct as normal user sudo make install). Can somebody explain me why it happens and what should I do to get rid of this problem? p.s. I'm using CentOS 5.7

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• I am one step closer to installing ubuntu, back is grayed out and I was stupid enough to not make a backup

  - by user283544

  Ok, so yeah, i've been stupid enough not to make a backup and 1 step closer to installing ubuntu. What I need is that is windows totally safe and not gonna be touched I made a new partition from windows, and in ubuntu installer I chose "Something else" Then I chose that partition as an ext4 and mount "/" Device for bootloader is my hard disk, /dev/sda/, that's what keeps me a little aware. So I need a quick answer is my windows 7 gonna be touched?

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• Make a server ( other than the router ) to be the default gateway for a subnet

  - by powerguy123

  I am trying to make a server ( lets call it server_A) which is different from the router to be the gateway for a subnet. Why do I want this ? I want to host a loadbalancer on server_A using LVS-NAT, and I dont want to implement a V-Lan or IP-IP tunneling. I have modified the routing tables of the remaining servers on the subnet to use server_A as the gateway. I have set server_A to not send ICMP reroute packets. But most traffic from servers in that subnet to outside clients are still being sent through the original gateway, bypassing server_A. Is there any other configuration I need to set in order to achieve my goal ?

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• Do control groups improve system performances?

  - by qdii

  According to this website, enabling cgroups in the kernel can boost performances by sharing resources in a better way. In particular, the conclusion states that:  Nevertheless, with a little trial and error, cgroups can help you improve the efficiency of your systems’ resource usage and avoid downtime due to overusage of a single service. Kernel seeds, however, recommend to deactivate them altogether. They say: Consider these [kernel] settings poison. They remain nothing but system slow-downs. They are all off by default [in the proposed kernel config file]. Who should I trust?

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• Switching To Ubuntu 14.04 from Windows 8.1

  - by Asangam

  everyone i am newto these linux stuffs. Currently i'm a user of Windows8.1 . When windows 8 was roling out i was like i'm never going to leave and will be always stick to windows8 but now i think it's time to switch linux because being in windows forever i don't think i can do something very good .I wanted to be OpenSource :) . So i really dont have any idea about linux . For me the best distro is Ubuntu and Kubuntu offcourse the latest release . So what i'm afraid of switching to linux is its compability .The compatibility i'm talking about is with the hardware's and driver's . For eg sometime after fresh install of windows we need to install the display,usb and wifi drivers to function . For some computer or brands those driver's are hard to find and i can't even think of linux how hard are they to find if it needs installing drivers. So my main question is that do i need to install the drivers for my wifi adapters display and some other stuffs or the distro i choosed i.e Ubuntu 14.0.4 consists of those dirvers and what about the 64 and 32bit . My machines is 64bit aso do i need to install the 64bit one . I mean i know the advantages of installing the 64 bit one but like windows is it kinda hard to find softwares for the 64 bit one . Or the 32 bit is recommended . And Yes I will be highly appreciated for the answers to my questions . Thank You :)

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• Availability of big files on multiple servers

  - by Imises

  I have to handle many (1'000 - 30'000) big files ranging from 200MB up to 2GB. The demand for these files is variable (0 - 300 downloads / file). This is why a single file must saved on 2 or more servers. My servers are placed in different datacenters (France), with different size HDDs (750GB to 4TB). Currently I share the files using PHP and ncftpget / ncftpput, but it's very slow. I need a solution to handle balancing these files across 7+ servers.

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• Unable to Install ubuntu onto a blank hard drive

  - by user287561

  I just built a pc and I am trying to install Ubuntu 14 onto it. I did the process in which you format the flash drive to be able to have Ubuntu 14 and install directly in BIOS. BIOS is set up to boot from the flash drive. Every time I try to do the install process, it will randomly reboot itself onto the motherboard BIOS menu. This loop constantly occurs and the only way I can use Ubuntu is to put the option of trying but not installing. HELP!

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• Any help please, Not reconizing my hard drive

  - by Imperial0007

  If any1 can help would be much appreciated.. I recently build my own PC would like to use for gaming etc.. (With Ubuntu of course as my OS) Installed Ubuntu via Flash Drive Everything is connected. Purchased a Graphic card/GPU GPU info;(XFX Double D R9 270 925MHz Boost 2GB DDR5 DP HDMI 2XDVI Graphic card) Now my problem is when i put the CD to install the GPU Drivers it would not recognize the HDD So why is the hard drive not being recognized HDD info;(ADATA USA Premier pro SP600 32GB SATA) I am able to enter the BIOS menu (If that helps) Any help would be much appreciated & Thanks in advanced

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• \windows\system32\config\system is corrupt or missing

  - by user16877

  Hi I had a server pc with the following error. \windows\system32\config\system is corrupt or missing As to fix it i replaced the files instructed here http://support.microsoft.com/kb/307545. Problem solved and I was able to boot up to windows desktop. But now none of the usb ports recognize any of the usb devices such as mouse, keyboard, thumbdrive nada... The usb mouse powers up (the light at the bottom lids up) but no functionality. Has anyone experienced this kind of behaviour any tip is really appreceiated. PS:There is no PS2 ports for both mouse and keyboard. Edit: Same behaviour persists in Safe mode also.

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• IIS is not accepting connections after WIndows system update

  - by user78102

  I've been running a web site for the past year on Windows Home Server 2008 R2. After the March 2012 system updates, the site is no longer accessible to clients. They see this error: website is online but isn't accepting connections. Ping tests to the FQDN of the server are successful and NSLOOKUP returns the correct result. The Internet connection tests out good from the server. I have not changed my internet connection (Comcast Business Internet) or my router configuration (I forward incoming requests from the outside to port 80 of the local IP address of the server). I have tried: Disabling the Windows Firewall. Rebuilding the OS and configuration. I still have the problem. How can I resolve this?

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• When should I go for Varnish / Nginx or Lighttd ?

  - by phoenix24

  I am fairly new to using any three of theses, so it will really help in knowing what specific features are most optimized of any of these three webservers ? and in what scenarios should I choose over the other ?

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• messed System Files on Mac PPC

  - by glider

  My buddy deleted her System folder from her PPC Mac wanting to get that space for something else. She copied it first in another drive (she had partitioned disk).She haven't emptied the Trash Bin yet. The screen just froze right after she moved the folder to Trash. We tried to use the install disk but even if we try Power-C on booting,it would try to continue,display the apple logo page then quickly follow it with black screen filled with dumps of hex codes and "We are hanging here..." We have a Windows-based PC that we tried to connect using ethernet cable but we can't find her computer from there. What should we do now???

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• Ubuntu 14.04 install on hardware with RAID

  - by nolak

  I've just built a new machine using an ASUS Mobo with 8GB of RAM and set up RAID 10 with 4 new HDD. I want to install Ubuntu 14.04 on it and so far have tried to do so 3 times with no luck. The installation seems to work fine but after it has finished it restarts and all I get is a black screen. Is there something I am missing? I've completed the install on other machines before without issue I just never tried it on a machine with RAID set up.

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• ID Badge Access System for Building with Active Directory Integration [closed]

  - by Alex

  I hope this is the right place for this question. So, we're looking into setting up a building access that uses badges or cards of some kind. I wanted to ask the users on here if they've had to do such setups and/or if they have recommendations? Is there maybe a system that integrates with Active Directory? I know one of the things our managers want to do is to be able to run reports on when people are entering the buildings. I'd appreciate any suggestions and thanks in advance!

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