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• High system cpu load (%sys), system locks

  - by Mark

  For the last two weeks we are having intermittent severe spikes in system cpu usage (shown as %sys), which last for maybe half a minute, locking most processes, including ssh. I've been trying to figure this out, but atop doesn't show anything relevant (system usage for processes it shows is insignificant), spikes are intermittent and I could not reproduce the spike using any workload for the web application this webserver hosts. If you have any ideas on how to debug high %sys and (sometimes) %si CPU usage, please share them. System specs (don't know if any of this is relevant): Dedicated server, CentOS 6, core i7 950, consistent 4 to 8 GB RAM free at any time, hard drives are in RAID-1. Additional info: dmesg output doesn't change between spikes /var/log/messages doesn't change between spikes Here is cat /proc/vmstat Here is output of mpstat 1 during a typical spike Add 07.11.11: looks like simple reboot restored system state, and we might never know what caused the disturbance in first place.

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• Can I use my old Sony Handycam TRV815 as a web cam?

  - by Optimal Solutions

  Has anyone ever used their old Sony Handycam (or maybe any older hand-held camcorder) as a web cam? As in streaming the live video from the cam to a web server (local or remote/Internet). My TRV815 has a pretty darn good picture quality for its time.. Via USB or Ethernet. It has S-Video but I think that is input. It has RCA out (white/red for audio and yellow for video) and I have used that to display to my TV. I have web cams already but was wondering if I could put this one to use also just for kicks..

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• Seemingly random disconnections on Windows Server 2008 R2

  - by bobblez

  So I have a box running a Windows Server 2008 R2 in my LAN, which is running, among other things, a voip server used by other people. I myself am in the same subnet with the server, while the other users are not. Now, maybe on average twice a day, all the other users get disconnected from the server (and if I take a remote desktop connection to it, I'm not able to open any web pages either). These disconnections usually last only about 5 seconds, but sometimes they may last up to a minute. What could possibly cause this? I have all the updates installed from windows update and the motherboard of the server is asus p5b deluxe (if that is of any interest). edit: Forgot to mention that my own internet connectivity stays intact while the server's does not, and both computers are behind the same router.

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• Fill rows down quickly (column or matrix of zeros)

  - by Mark Miller

  I have an extremely basic question, but I have never found the answer by searching the internet. I simply want to create a large column of zeros with Excel. Sometimes I want to create a huge matrix of zeros (maybe 600 rows by 500 columns) and then replace a few zeros with 1's to create a model design matrix. I have always started by creating a column of, for example, 10 zeros, copying and pasting those zeroes, then copying and pasting the resulting column of 20 zeros, etc., until I had the desired number of rows. Then I would copy and paste that column of zeros one at a time over and over until I had the desired number of columns. This procedure is tedious and time-consuming and I know there must be an easier way. Do you know of any other methods?

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• can I connect two modems and comunicate on two side

  - by GongT

  I just wondering how modems work. I know the process of "modulation" and "demodulation". So I wanto know is "demodulation" are simple revese of "modulation" in real world. The PC can got an IP address when connect as type 1 What will happen when I connect them like type 2? type 1 : [PC] ================= [router] type 2 : [PC] === [m] ------- [m] === [router] [m] : modem(exactly same) === : Ethernet cable --- : DSL cable (phone line, maybe optical fiber, or something else?) ISP has a large number of model, Is them same thing as the one in my home(but with diffrent size/speed/price...etc)? Or it's completely different thing?

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• Windows 8.1 triple monitors - can't enable all 3 at the same time

  - by Jeckerson

  Today decided to update from Win8 Pro to Win8.1. Everything was fine with enabled 3 monitors (Extended mode, not Eyefinity) at the same time. But after update can't enable 3d monitor, only 2 could be enabled at the same time. Did current things before write question here: Remove all drivers, reboots, re-installs Different cable input's and orders of enabling Tried to enable each monitor from Catalyst and Windows Screen Resolution Spec's: Windows 8.1 Pro XFX HD7970 3 of LG E2442 Cables: 2 DVI 1 HDMI Googled for many time and found one of possible solution is to buy ACTIVE mini DisplayPort to DVI/HDMI, but maybe there are some another more simple solutions?

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• How to get a remote desktop / X11 with ubuntu 10.04 LTS from mac os x?

  - by cwd

  I am running Snow Leopard OS X 10.6 and I have X11 installed. I also have ubuntu 10.04 LTS running on a remote machine. I have root privileges. So far I haven't really installed anything besides the operating system. This was done in an amazon aws type of way. I see people talking about getting gnome or a "remote desktop" type of thing working, but I'm not sure how to go about this. I connected and then typed in gnome-session but nothing happened. Maybe I don't have that thing installed yet? Can someone point me in the right direction? Also, is it possible to just start an X11 session with a single app, like notepad or a file and folder browser?

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• How do I offset centered text (without fancy CSS, DHTML, etc.)?

  - by Larry

  Hi, Quick, hopefully easy question. Google is failing me. I don't want my text exactly centered. I want it maybe 7 characters (blank spaces) over. What do I add to this to do that? <.centerThis is centered<./center Adding blanks in front of the "T" does nothing. (I added the dots in the code above because I can't get <.code blocks/spans to let me put the html code here.) (Nothing fancy - no CSS, DHTML, XHTML - just plain old HTML.) Thanks.

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• /etc/hosts in Windows 8.1 doesnt work like in Windows 7 [on hold]

  - by user225438

  Last time when i installed Win7, i configured it to block some netbios names in LAN with hosts file. Something like this: 192.168.0.10 computer_name 192.168.0.10 computer_IP where 192.168.0.10 some ip-address in network, where user need to login to access it. So, when user trying to access computer_name via \\computer_name, he will redirect to 192.168.0.10 rather then going to computer_name. In Windows 8.1 I can't do this trick. I tried to disable Windows Defender, flushed DNS, nbtstat -R. Nothing works. When I pinging computer_name, IP address returning 192.168.0.10, but when I accessing it via explorer (\\computer_name\d$), it opening computer partitions. In Win7, when I trying to access \\computer_name, its trying to open 192.168.0.10 one. Maybe its not the best solution to do this, but it works in Windows 7.

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• Is ceph usable with only 100Mbps bandwidth between nodes?

  - by vaab

  I haven't great hardware, but my requirements are low, I would like to start using ceph so as to abstract filesystem location and allow potential easy scaling to bigger hardware in an hypothetical future. My actual hardware meets ceph hardware requirements except the ethernet bandwidth part between the hosts. Mine is 100 Mbit/s which is much lower than the 1Gbps expected in ceph, even from the minimal requirement. Will I be able to use ceph in a very small smili-prod environnement (with limited number of clients) ? FYI: My hardware is 2 or maybe 3 hosts having each 4 core Intel, 24Go RAM, 2x2To disks but 100Mpbs between them.

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• Setting up VPS hosting

  - by RobinFTW

  I'm trying to set up my own vps hosting. It wont be a paid service, just an experiment for me and some nerdy friends. What I'd like to be able to do is this: Run multiple virtual servers on 1 external IP. These servers can run anything from Minecraft servers to simple http servers. They will also need to be accessible thru SSH. What I don't get is how I can address these servers using domain names. I've done some research and found out that I could use Vhosts with Apache. However this only applies to http servers. It was also suggested I'd use a reverse proxy(squid) but this also only applies to http requests. I could just use different ports for different servers, but thats not ideal and not what I want. Can someone suggest a setup? Maybe some tutorials or anything.

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• minimum required bandwidth for remote database server

  - by user66734

  I want to build a small warehousing application for my company. We have a central warehouse which distributes to 8 sales points across the country. They insist on an in-house solution. I am thinking to setup a central mySQL db Linux server and have the branches connect to it to store sales. Queries to the db from the branches will be minimum, maybe 10 per hour. However I need all the branches to be able to store each sale data ( product ID, customer ID ) in the central db at peak time at most once every five minutes. My question is can I get away with simple 24mbps/768kbps DSL lines? If not what is the bandwith requirement? Can I rely on a load balancing router to combine additional lines if needed? Can you propose some server hardware specs?

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• Symlink to /Documents /Pictures etc. in OS X Home Directory?

  - by Larry O'Brien

  I have just purchased a 120GB SSD with the intent of making it my boot drive. I'd like to keep it as lean as possible since, y'know, it's so small (Heaven help me). I've read Can I move my home folder in Mac OS X? and Moving Mac OS X user folders? which discourage moving the entire home dir to a data drive. Is it possible and less-dangerous to leave the home directory on the boot drive but move the big data directories to a slower drive and symlink to them? I have the same thoughts with the /Applications directory, but maybe I should make that a separate question?

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• How does storage spaces decide where to put my files?

  - by George Duckett

  With Windows 8 Storage Spaces, you can lump many hard disks of varying types, speeds and sizes together to use as a single storage space / logical drive. How does Windows decide what to place where? For example will it move files about depending on frequency of access? Maybe splitting files frequently accessed together between hard disks etc. What does it optimize for? Speed, reliability, etc? If the above is asking too much, can I easily see where the files are physically (on which physical disk)?

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• How to deploy Windows-8 Enterprise Apps to other users?

  - by TToni

  Windows-8 (Metro) Apps can be installed using "sideloading", bypassing the Windows store in enterprise environments. In principle this is easy: Once you enabled sideloading (which is automatically done when a Win8-machine joins a domain), you can install a signed appx-Package through PowerShell with the "Add-AppxPackage" command. But there is a catch: The App is only installed for the user who executes the command and there is no "-Credentials" parameter! I can probably solve that problem in my specific scenario, where I deploy a self-developed app through TFS build to a virtual machine with a fixed demo user (by using remote powershell in combination with "Add-Job", which does take a credential parameter and because I know the given username and the password). But that is not true in an enterprise environment, where I want to distribute my App to thousands of users. Cracking all their passwords seems a bit over the top, so what would be the "correct" way to do this? I can't find any useful information from Microsoft about this, but maybe one of you already ran into this problem and solved it?

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• Time of splitting and encoding video with ffmpeg increases exponentially

  - by Rnd_d

  I'm trying to split video by subtitles and encode into .mp4(h.264/aac) using ffmpeg, but it takes so much time! First pieces of video are splited and encoded really fast, but for each iteration time increases, and so 40 min video takes all night or more. Small 3 min video takes max 10 mins. cmd for splitting and encoding: ffmpeg -i filename.avi -ss 00:00:0(time of sub start) -t 0:0:3(time of sub duration) -acodec libfaac -vcodec libx264 -bf 0 -f mp4 filename.mp4 ffmpeg version N-34849-g07c7ffc (last, i think) How I can make it faster? Are there, maybe, some magic arguments for ffmpeg or some hacks?

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• Hide a 2nd Monitor from a Programs Print Screen

  - by jasondavis

  I run 2 monitors on a PC that also runs a program for the Freelancing site Elance.com. The program they provide, takes screenshots and uploads them to my account for a client to see at different intervals. My goal is to make the screenshot that the program takes and uploads, to somehow only take a shot of my "Main" or "Defualt" monitor and ignore my 2nd monitor. The main reason is my 2nd monitor generally has private data that I do not displayed to the world on a website. Does anyone know if there is any kind of program or trick I can use that will make it appear that I have 1 monitor when a Screenshot is taken? I am not sure how the program does it and how that works as I am a web developer and not a C++ or any kind of low level programmer. If the Elance program simply runs the same function that is called when a PrintScreen key is pressed on a keyboard, then I am thinking it might be possible to maybe trick that into only the default desktop? Any ideas or help would be appreciated, thank you

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• Asking for brief explanation of reverse proxying and recommended software

  - by 80skeys

  I need to set up a reverse proxy where the backend web server is serving https pages only. I've never set up a reverse proxy and would like a brief overview of how it works. One of my questions is whether the proxy needs to run https also, or does simple http suffice? Second question would be whether to use Apache, varnish, nginx, or squid. This is for an internal site for a small company, so not a lot of traffic expected. Maybe a few dozen users each day.

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• Manual vmware image creation

  - by Gzorg

  A laptop hard disk is being defective, but I managed to be lucky enough to get access to it, using an Ubuntu live cd. Now, I think it would be nice to dump the whole thing, using, for instance, a combination of gzip and split. But that would make the resulting files unusable. I could make a VMware image of it instead. I'm currently looking for the answer, which involves finding how vmware manages fixed size virtual partitions, but maybe you already did this before. Thanks.

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• Is there a difference in page fault rates between CPU bound and I/O bound processes?

  - by user198864

  I was thinking, should there be any difference in expectation of the page fault rate on CPU-bound vs I/O bound processes? At first I thought maybe we could, since CPU-bound processes would likely be using more memory accesses per time quantum, so I expect it would move from locality to locality faster. At the same time, the CPU-bound process is probably given a larger working set... but this doesn't affect the fault overhead as it hits a new locality IF this wasn't pre-paged in. Is there actually any real difference in the page fault rates or am I just musing about something nonexistent? And if there is, how would it impact a real-world OS like linux?

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• Change windows default path or last used path for saving files? Is that possible?

  - by Mark

  I'm trying to change the default saving path to my specfied path for example if the file is picture (.jpg .gif etc..) and using google chrome I save an image the path can be anything from default or last used so I want it to be mine specfied for example I choose "C:\SaveHerePics" I don't know how you can change it maybe Registry? Dll? I would like to create vb.net program with textbox you choose the new location to be located every time for example "C:\SaveHerePics" and it should not have anything to do with this program even if you close the program the default location for pictures saved via any program or source saved to "C:\SaveHerePics" Thanks a lot for your help!

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• Using Dropbox API instead of a FTP server for backing up DB/Source in your application.

  - by Somebody still uses you MS-DOS

  This is a small aplication scenario. Usually, when you have to do some backups of source code/database on your server, you use a second ftp server, a cronjob to tar.gz your db dumps and source files, and send this file to your ftp server from your application server. Dropbox created an API to use it's infrastrucutre. Since they provide 2gb for free accounts, I thought about being able to upload to it instead of a ftp server. So, if you do some freelance work, you can create a free account for each client and use this approach, maybe encrypting the files you send. You even gain a revision for each sent file, like a revison control system, for free, from the last 30 days. What do you think of this approach? Is it possible? And, more importantly: what are the security risks involved? (That's why I'm asking this on serverfault, since this POV from sysadmins will be more accurate). Thanks!

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• Fresh Vista install and the strange appearance of boxes/rectangles

  - by Nick

  I purchased a new hard-drive, and after doing a fresh install of Vista and installing all updates/latest drivers, I'm noticing that all of a sudden and shortly after being powered on, I get black boxes/rectangles all over my screen (below). Any ideas as to what could be causing this? On a (maybe) related note, my brand new hard-drive is squeaking. Not often, but it is there. Debating on whether or not it is worth the hassle of sending it back, or if this is related to the mysterious rectangles.

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• Desktop Properties Background selection problems

  - by Gazza

  From the Desktop of my XP Home Edn SP3 system, under the Right-Click Menu Properties, the [Desktop] tab, of the 'Display Properties' window shows a selection list for the Desktop's Background image. For me this list has become frozen and its slider (at right) will not move. The [Browse] button and the 'Position' dropdown list (whether the selected image is centred, stretched, etc) are also greyed out. I can still use both the Color dropdown list at the right of the Background list and the [Customize Desktop] button below it, and make any changes as desired. What's gone wrong. I'm guessing maybe a registery setting or I've deleted a file somewhere, but haven't found the cause as yet. Any suggestions?? Thanks.

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• enable tcp_syncookies even after reboot

  - by Tim

  I'm running Scientific Linux 6.1 and would like to set net.ipv4.tcp_syncookies=1. I've set that in /etc/sysctl.conf and, if I do a sysctl -p then sysctl -q net.ipv4.tcp_syncookies it shows it's properly set. Sadly, if I reboot the machine, and sysctl -q again, it goes back to 0. I've tried to grep around and see if something else is resetting it to 0 during the boot process but haven't turned up anything. I've googled and everything points to sysctl.conf. The only thing I can think of is maybe networking isn't up by the time that file gets read but, honestly, I'm a developer and well beyond my natural skills here:) I'm tempted to just set it directly in /etc/init.d/network but then that feels hackish and so, I thought better of it and I'm here in search of the "right" way to do it. Any pointers?

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