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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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• Request to server x Reply from server y

  - by klaasio

  I need some advice from you guys: I'm dealing with a custom loadbalancer/software for which we will use 2 main servers and about 8 slave servers. In short: User sends request to main server, main server will receive and handle the requests, sends a request to a slave server and slave server should send data DIRECTLY to the "user". User - Main server Main server - Slave server Slave server - User The reason for which data should be send directly to the user and not through the main server is because of bandwidth and low budget. Now I have the following idea's: -IPinIP, but that is not possible in Layer7 (so far i know there some expensive routers for that) -IP Spoof, using C/C++ we will make it look like the reply came from main server. But I was thinking, perhaps the reply "slave server - User" could just come from a different IP without causing issues in the firewall from the user or his anti-virus. I don't know so well about "home" firewalls/routers and/or anti-virus software. I guess the user machine wouldn't handle it well?

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• Random Connections to MySQL refused (Error 111)

  - by joatis

  A Perl/CGI webapp that has been running fine for almost a year has started to randomly been unable to connect to a remotely hosted MySQL. The Error thrown is : Can't connect to MySQL server on 'xx.x.xxx.xx' (111) Reloading the page often solves the problem The client is using Perl, DBI and SSL to connect to MySQL using the same configuration file each time. MySQL 5.0 Server Running RH EL5 Quad-Core AMD Opteron(tm) Processor 2374 HE, 8 cores Real Memory: 15.73 GB total, 11.81 GB used allows networking in my.cnf max-connections are not being met load is low. The servers firewall is open to the client's subnet. The mysql user has permissions from the client's subnet. I have my host looking into the problem but so far we're all stumped as to way the occasional connection is (increasingly getting refused) Any advice what to check that would cause the random refusal of connections?

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• How can I disable write protection in my USB flash drive?

  - by 97847658

  My USB flash drive is currently unusable because it somehow (quite suddenly!) became write protected. I have googled around and tried many solutions to this problem, but none of them have worked so far. Here are some of the solutions I've tried: The drive has no tangible switch or button. Formatting the drive won't work, even in command line, even "low level formatting", because the drive is (after all) write protected. Changing certain registry keys to 0 doesn't seem to work. Repair_Neo2.9.exe says "USB Flash Disk not found!" One factor that may make it more difficult to find a solution: I have no idea what the make or model is, because I received the USB flash drive from my university as a gift. So if anyone knows how to find the make and model, that alone might be helpful. Any ideas? Thanks.

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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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• Increase Volume of an MKV Video from Linux Terminal

  - by The How-To Geek

  I've got a large amount of .MKV video files which seem to all play at a very low volume - I end up having to turn the TV up all the way to hear them, which is really irritating when I switch to another channel and wake the dead because it's so loud. What I'm looking for is a command-line method to increase the volume (so I can run it on all of them quickly) that would hopefully work regardless of the audio codec in use in the particular file. (I don't mind hard-coding the output audio though). For reference, I'm using Ubuntu 9.04 on my server, and the files are being played back with Boxee on a Mac Mini, but the volume problem is the same on Windows too.

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• Amazon S3 - Storage Class and Server Side Encryption

  - by Steven

  Ahhh! I am using Amazon S3 for some low price storage to clear down out SAN. I created the bucket and created a root folder. I set the storage class to standard and server side encryption AES. I started a copy job to move the files, some files copied over and i checked the files: Reduced Redundancy Encryption set to none WTF? So i deleted all files and folders. I manuallyed created the folder structure and again set the storage class and encryption level. I coped some files and bamm, still showing (at a file level as Reduced and no encryption). So my question is this, is it really raid'd and encrypted just not showing it properly (as the root folder is, how can the file not be??) or (b) am i being a huge tool and missing something?

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• process ksoftirqd consumes permanent 15% CPU load [closed]

  - by markus

  Possible Duplicate: Anyone else experiencing high rates of Linux server crashes during a leap second day? The process ksoftirqd/0 uses permanent 15% CPU on our debian squeeze server. 4 root 20 0 0 0 0 R 15.0 0.0 850:59.17 ksoftirqd/0 I already read that this can have various reason like Full harddisk or high network traffic. In our case we do have more or less low network traffic and enough space on hard disk. How can I analyse what causes ksoftirqd/0 to use permanently 15% CPU?

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• need help setting up a VPN for remote computer connection

  - by Chowdan

  I am on a low budget right now. I am currently in the process of starting a computer company. I am in need of a VPN network so I can run Dameware tools for working on customers/partners computers remotely. I will be working with Windows and some Apple and linux machines. I have desktop with an AMD Phenom II 965BE(currently running stable at 3.8Ghz) processor with 8 GB of ram and a radeon hd 6870(i know graphics aren't too useful) and about 1.5TB of HDD space. I am attempting to create a network out of my office based all on one machine that would also be secure for me to remotely connect to my partners computers so when they have issues I would be able to connect and do the diagnosing and repairs remotely. What types of servers besides a VPN server would i need to create this? I have access to all Microsoft products so I can run Windows Server 2012, Windows Server 2008 R2, or any other Microsoft Software. thanks for the help all

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• How to bring back a far right chromeless window?

  - by Click Ok

  Accidentally some windows goes far right, and "goes out of" to the monitor. I know keyboard shortcuts to move it back when the windows have a title bar. But that windows (HTC Home and Rainlendar) don't have title bar, doesn't appears in windows TaskBar or TaskManager. I've tryed restart windows; to close and reopen that software; change the resolution to very low, and then to very high; but it doesn't works... I know that I can dig in the settings files of that programs, but I think interesting discover how to bring back that windows so I can use that technique if that problem appears again with another softwares too. Thank you!

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• Java on 256MB system?

  - by Mike S.

  For a school project, I've registered a free VPS on a hosting provider (pipni.cz). It has 256MB RAM: Mem: 262144k total, 148104k used, 114040k free, 0k buffers It's running on Debian Squeeze. I always get this error when I run a Java program: Error occurred during initialization of VM Could not reserve enough space for object heap Could not create the Java virtual machine. I tried to use Xms, Xmx, Xss with low values and still same result. ulimit -v gives me "unlimited". My application will be pretty simple and I need to use rmiregistry also. Can somebody help?

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• Server 2003 saying unlicensed

  - by nat

  I came in this morning to our windows 2003 server - running only SQL server 2005 saying it was unlicensed. When logged straight onto the box as soon as I got past the login, it popped up the click yes to license, did that and it would just loop back around to the login. It wouldn't turn off, couldn't remote to it, after a power off and reboot, it magically decided it was in fact licensed. It didn't appear to be low on disc space or other resources. Logs not showing anything out of the ordinary. Has anyone else experienced this, or might have an idea as to what just happened? Any help much appreciated.

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• Should I create a second WAN Interface for a new SSLVPN setup on my Sonicwall 2400?

  - by TheSuperman

  Sonic Wall 2400 I'm setting up a new SSLVPN on our Sonicwall, very new to this. I currently have an exchange server as well, so mail.company.com is directed to our mail server. I'd like to setup a clean link for my low end users, remote.company.com to be for the SSLVPN, but I'm not sure how to do this within the Sonicwall? I setup SSLVPN on port 443. Only 1 WAN setup, on the X1 Interface. We have an A record setup with the same static IP used on the WAN Interface, and is configured for mail.company.com. Should I use a new static IP from our block of usable IP's to create the new Remote.Company.com? If so, I have no idea where to start on this on the Sonicwall? Any suggestions?

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• VLC Caching levels

  - by Svish

  When I open the Preferences of VLC and go to Input & Codecs, I have a setting called Default Caching Level. I can choose between Cusom Lowest latency Low latency Normal High latency Higher latency I'm used to caching being set in seconds or something like that. So, more seconds/higher buffer means less chane of buffer underrun while streaming. What is latency? What does it mean to set it lower or higher? In what cases should I go in what direction? If I'm struggling with buffer underruns, should I set it to lower or higher latency?

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• Dumb Terminals, Virtual Desktop

  - by user67714

  I need some help in setting up a dumb-terminal type concept for Windows machines. We have a computer lab with 40 computers, all of them are ageing. Unfortunately, we don't have enough funds to get all of them replaced. On the other side, we have very powerful rack servers which are quite underutilized. I was thinking of a solution which would enable those lab computers to use the rack servers. Remote desktop is an option, but I wanted something that is more transparent to the end user. Are there any free or low cost solutions for such an scenario?? Thanks

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• Use backups if unavailable (not just down)

  - by PriceChild

  Using haproxy, I want: A pool of 'main' servers and 'backup' servers, though they don't necessarily have to be in separate pools. Each backend has a low 'maxconn' (in this case 1) Clients should not wait in a queue. If there are no immediately available servers in the 'main' pool they should be shunted to the 'backup' pool without delay. Right now I have one backend, 'main' servers have an absurdly high weighting and it 'works'. acl use_backend + connslots is along the right lines but without the patch in my own answer it isn't perfect. Bonus points for not requiring a modified haproxy binary.

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• Is there a way I can find if my hard disk data was stolen? [closed]

  - by Bridget

  How can I tell if the repair shop stole my hard drive? I had my computer in the shop for a couple of days to get a diagnostic check and he quoted me $130. I have a family member who said he would do it for $30 so I rejected the offer and requested it back. When he returned it I hooked it back up and now I get a low disk space warning; when I dropped it off I had at least 50 gb of space left, on a total of 149 gb and all my pictures movies, and music are gone. Can I find if he indeed did steal my hard drive or something?

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• Apache Connection vs. Request

  - by user101570

  I apologize in advance if this is a basic question, but I am quite confused after reading the Apache documentation and other tutorials. Does a single Apache prefork process serve all HTTP requests for a given client? That's what I thought, but when I reduce maxclients down to a low number, my page load times go to a crawl. This despite the fact I'm the only client on the server in question. This would suggest each process serves a single HTTP request at a time, rather than serving all requests within the TimeOut window. So if a single webpage requires 15 HTTP requests to load fully, do I require 15 prefork Apache processes to optimally serve it?

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• Setting up a reverse proxy [on hold]

  - by mrwooster

  I am looking for the best solution for setting up a very low maintenance reverse proxy for a production website (example.com). The setup is as follows: A blog with will be hosted on heroku, and will reside at example.com/blog A static info page which will be hosted on S3 and will reside at example.com/signup A dynamic content management system, provided and hosted by an external vendor which will respond to requests for any other pages. The two solutions which come to mind are: Use HAProxy Ask the external vendor to reverse proxy requests for /blog and /signup The obvious solution would be to use HAProxy, but, if at all possible, I would like to avoid having to setup and maintain another server (especially such a critical one). I came across a company called Snapt which offers hosted HAProxy solutions, but its more geared towards load-balancing than reverse proxying. Option 2 is a possibility, but gives us very little control over changes and configuration. I see a lot of sites hosting blogs on /blog so this must be fairly common practice, am I missing an obvious solution?

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• Performance impact of running Linux in a virtual machine in Windows?

  - by vovick

  Hello, I'd like to know what performance impact I could expect running Linux in a virtual machine in Windows. The job I need Linux for is heavy and almost non-stop code compilation with GCC. Dual-boot doesn't look like a very attractive solution, so I'm counting on low VM overhead right now (10-20% would be fine for me, but 50% or more will be unacceptable). Did anyone try to measure the performance difference, are there any comparison tables? What virtual machine with the lowest overhead possible will you suggest? My host OS is Win7 and I've got a modern Core i7 with VT-x present. Thanks!

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• My microphone is too quiet

  - by AmitM9S6

  I've been chatting with skype for a long time.. and I don't know why, but for X time it's fine, and then it's too quiet.. Here how it goes : I'm booting the PC - getting into a skype call with friends - talking with friends on skype - (everything goes well) - Closing the skype call - Going back to a skype call like a hour after -. They can't hear me well, I have to shout so they'll hear me, and in the settings, it's on 100% + 30 DECIBELS, so I can't raise it higher... and if I'll re-boot my PC, it'll be well until I'll close the skype call again.. Every time I'm skyping with friends well, and then when I close the call and come back after a while, they hear me really low(volume).. I've been trying to fix this problem for about 2 months! If you'll be able to help me, I'd be so happy. (btw It's connected not through USB, but through a microphone connection and headphone connection...) Also, I got Windows 7..

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• My microphone is too quiet (seems to be connected with Skype)

  - by AmitM9S6

  I've been chatting with skype for a long time.. and I don't know why, but for X time it's fine, and then it's too quiet.. Here how it goes : I'm booting the PC - getting into a skype call with friends - talking with friends on skype - (everything goes well) - Closing the skype call - Going back to a skype call like a hour after -. They can't hear me well, I have to shout so they'll hear me, and in the settings, it's on 100% + 30 DECIBELS, so I can't raise it higher... and if I'll re-boot my PC, it'll be well until I'll close the skype call again.. Every time I'm skyping with friends well, and then when I close the call and come back after a while, they hear me really low(volume).. I've been trying to fix this problem for about 2 months! If you'll be able to help me, I'd be so happy. (btw It's connected not through USB, but through a microphone connection and headphone connection...) Also, I got Windows 7..

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• SQL Server 2008 (64-bit)

  - by Grace09

  I have transaction log backup failures randomly. SQL Server Log says 'Memory constraints resulted reduced backup/restore buffer sizes. Proceding with 6 buffers of size 64KB.', and the SQL Server Agent Error Log has quite a few errors like 'Unable to start Job Manager thread for job xxx', '[298] SQLServer Error: 768, Client unable to establish connection [SQLSTATE 08001]', [298] SQLServer Error: 768, SSL Provider: Not enough memory is available to complete this request [SQLSTATE 08001]'. I am really low on the memory? It has total of 32 GB, but I set maximum to 20. Task manager shows it is using 99% of physical memory. Memoryclerk-sqlbufferpool has 32GB for the Virtual Memory Reserved, and 20 GB for the Virtual Memory Committed. From the perfmon, SQLServer:Memory Manager/Total ServerMemory shows 21GB of memory in use, that's what I set the maximum to. I don't where the rest of memory go. Can anyone advice? Thanks in advance.

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• Unable to use strong encryption

  - by user224299

  So I am exploring Apache to create a simple example: the default page and a directory "secure". I everyone to be able to access the server but, when one wants to access the "secure" directory, I the connection to use strong encryption. I am using apache2.4. However this is not working and I don't know why! I have done just like in the Apache tutorial: LoadModule ssl_module /usr/lib/apache2/modules/mod_ssl.so <VirtualHost *:443> SSLEngine on SSLCertificateFile /home/vitorpereira/Desktop/cert.cer SSLCertificateKeyFile /home/vitorpereira/Desktop/key.key </VirtualHost> SSLCipherSuite ALL:!ADH:RC4+RSA:+HIGH:+MEDIUM:+LOW:+SSLv2:+EXP:+eNULL <Location /var/www/html/secure> SSLCipherSuite HIGH:!aNULL:!MD5 </Location> But this does not work :/ And, I can access the secure folder with http but when I write https, it says not found!

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• SFML: Generate a background image

  - by BlackMamba

  I want to generate a background, which is used in the game, on every instance of the game based on certain conditions. To do so, I'm using a sf::RenderTexture and a sf::Texture like this: sf::RenderTexture image; std::vector<sf::Texture> textures; sf::Texture texture; // instantiating the vector of textures and the image not shown here for (int i = 0; i < certainSize; ++i) { if(certainContition) { texture.setTexture("file"); texture.setPosition(pos1, pos2); } else { ... } image.draw(texture); } The point here is that I draw single textures on a sf::RenderTexture, but because textures always are on the graphic cards memory, I can't exceed a certain map size which I have to. I also considered using an sf::Image, but I can't find a way to draw an image (i.e. a texture) to it. The third way I found was using an sf::VertexArray, but this seems to be a bit too low-level for my rather simple purposes. So is there a common way to dynamically generate a background image based on other existing images?

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