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• Raspberry Pi based Hadoop cluster

  - by Dmitriy Sukharev

  Is it at least possible to build Hadoop cluster from Raspberry Pi-based nodes? Can such a cluster meet hardware requirements of Hadoop? And if so, how much Raspberry Pi nodes are required to meet requirements? I understand that a cluster from several Raspberry Pi nodes being cheap is not powerful. My purpose is to organize cluster without possibility of loosing personal data from my desktop or notebook, and to use this cluster studying Hadoop. I'd appreciate if you suggest any better ideas of organizing a cheap Hadoop cluster for studying purposes. UPD: I've seen that recommended amount of memory for Hadoop is 16-24GB, multi-core processors, and 1TB of HDD, but it doesn't look like minimal requirements.

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• Ubuntu 9.10 Dowload Speed Very Slow

  - by Don

  I'm running Ubuntu 9.10 desktop and I'm new to the Linux world, so bear with me. I'm on a corporate network of 3 T1s shared across 50-60 users. I typically get about 300 KB/sec for downloads, but for whatever reason, the Linux box will start out in that range, then drop to less than 1KB/Sec sometimes. Doesn't seen to matter where I'm downloading from. Right now I'm trying to get Eclipse for PHP and it's running at 3-6KB/sec. Getting the updates for the system will also drop to very slow rates. Our IT person has set up the machine to get the same 10.0.0.x address when it starts, and moved this IP to bypass our Proxy/Firewall going out, so that shouldn't be the issue. Can anyone recommend something I can try to better diagnose the problem. Again, I'm new to the Linux world and the hardware/OS setup side in general (coming form more of a coding background). Thanks for any advice.

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• solving network connection problem on xp

  - by doug

  Hi there I feel so stupid, because I have to fix my dad computer(which was mine years ago). So it is an old computer on which I have installed windows xp and the drivers for main-board. The device manager says that I have no more problems with the hardware. That computer has to connect to a router from my room but it doesn't. On ping 192.168.2.1 I get "Request time out"., The other computers are connecting to that router. Only the old computer doesn't connect to the LAN and later to the internet. Also it doesn't get a good IP(from the same class). After running ipconfig command I know that i have an IP with 169.... What can I do? Do you have any tips for me?

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• Access to a network server without port forwarding

  - by SdevDavid

  I have a network with the following structure. The server in PC2 is simple socket server TCP in 8080 port. I need to access to PC2 from other external network by socket client. This socket client knows the public IP (85.xxx.xxx.x), the private IP (192.168.0.21) and the port. How I can access PC2 without port forwarding on the router? If possible, I would like to have a reference in any programming language of this case.

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• Cannot Login as root

  - by Josh Moore

  At my work we ship our product on pre-installed servers as a software/hardware package. We are using open SUSE 10.3 for the OS and we setup and we always log in with the root user to do maintenance on the box. Recently we just had box returned to us that the customer said the could not longer connect to the box through the network interface. So when I started to work on the box I run into the this problem: At the command prompt to login i type the user name "root" and hit enter. Then even before it asks me for a password I get "Login incorrect". I have never seen this behavior before and could not find any information about it online. Does anybody know what is going on? Thanks.

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• How to put fear of God (law) into Wi-Fi hacking neighbors [closed]

  - by Shakehar

  I live in an apartment and some new guys have apparently moved into one of the apartments. They have been shamelessly hacking into my WiFi. Mine was initially a WEP encrypted network and out of laziness I just limited and reserved the IPS on my router for the people in my house. Yesterday I had to free up an IP for a guest in my house but before he could join the network these guys connected in. I have changed my encryption to WPA2 and hope they dont have the hardware/patience required to hack into it, but there are many wi-fi networks in my apartment most of which are secured using WEP. I don't really want to call the police on them. Is there any way to deter them from misusing other people's wi-fi ? I have gone through I think someone else has access to my wireless network. What next? but I have already taken the steps mentioned there.

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• Top causes of slow ssh logins

  - by Peter Lyons

  I'd love for one of you smart and helpful folks to post a list of common causes of delays during an ssh login. Specifically, there are 2 spots where I see a range from instantaneous to multi-second delays. Between issuing the ssh command and getting a login prompt and between entering the passphrase and having the shell load Now, specifically I'm looking at ssh details only here. Obviously network latency, speed of the hardware and OSes involved, complex login scripts, etc can cause delays. For context I ssh to a vast multitude of linux distributions and some Solaris hosts using mostly Ubuntu, CentOS, and MacOS X as my client systems. Almost all of the time, the ssh server configuration is unchanged from the OS's default settings. What ssh server configurations should I be interested in? Are there OS/kernel parameters that can be tuned? Login shell tricks? Etc?

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• Exchange Failover Solution

  - by Dan

  I've been given the task to come up with an exchange solution that will support 200 users total throughout 4 states. 1GB per user. It needs to have a failover solution,The failover must reside in another location. There is an mpls that connects the locations. I am hoping to get recomendations on hardware, software setups. I recently worked with some big name reps and they steered me in the wrong direction and now I'm a few days away from my proposal date with bogus quotes and scrambling for a solution. I used to manage a standalone 2003 exchange server for years and am at a loss now with figuring out a clustering/failover...Any help would be greatly appreciated. thank you

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• Does Windows 8 Need New, Specialized Drivers?

  - by Synetech

  It seems like an obvious question, but I’m having a difficult time finding out if Windows 8, with all its changes, will require new, specialized drivers. I see that a lot of manufacturers have started releasing Windows 8-specific drivers for their hardware, but what about those that are not, will Windows XP or 7 drivers work or have they changed the driver/system/security architecture again, thus requiring new drivers? The closest thing I could find to an answer was a thread in which it was mentioned that the display driver model was again updated, thus requiring new display drivers, but not much else (e.g., audio cards, printers, chipsets, etc.)

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• DNS Pointer to old server name

  - by TechKnow Dude

  We have a SBS2003 server that was migrated to a new hardware platform, the computer name has changed but the domain is the same. The desktop's are trying to do offline files to the old server name. There is a nslookup entry for the old server name and a DNS entry for the old server. How do we safely remove the old DNS entry without breaking the computer offline folder storage locally. Can we change the pointing location on the offline file storage to point to the new server name.

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• Is it a good idea to take onsite/offsite backups of server images?

  - by ServerAdminGuy45

  Assuming a non-virtualized environment it a good idea to take actual images of servers (using something like Acronis True Image) and store them on\off site? Backing up data is great but I feel it would be good to have copies of OS images in the event hardware dies or an upgrade gets botched I can always revert back. What would be your recommended way to do this (preferably using a NAS and an online backup service)? I was talking with the Iron Mountain folks and the service they described is more geared toward taking incremental snapshots of data. I'm not sure if there's a way to backup images in an incremental way such that only the changes between them are saved (that way I'm not wasting X GB each time I take an image).

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• Running multiple lines through a server.

  - by Kevin Roberson

  I am looking to buy numbers in bulk on DIDx.net. After I purchase the numbers in a particular area code, I want to forward those numbers to other numbers that are outside of that area code. This way it will be seen as a local call versus long distance. I have the customers but I don't have the system I need. I have read about Asterisk, VOIP, SIP, and BYOH. But I have no clue what will be the best system for me. Does anyone have any idea what my next step should be when it comes to hardware and software? Or what type of operating system I should use? I basically want to set up a system like GoogleVoice & Phonebooth.

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• Somebody knows why the sectors of the IBM floppy disk are named 1 to 8 (and not 0 to 7 )

  - by Olivier Briand

  I am now programming on a 8 bits Z80 computer with CP/M 2.2, (as a hobby) and the floppy disk format is IBM, 40 tracks, 8 sectors per track, 512 bytes per sector. free space is 154 Ko on each face of the disk. Why the sectors are indexed 1 to 8 (and not zero to seven, as usually is seen with computers)? The catalog of the floppy disk is on the track 1 (sector 1 to 4, 64 entries). I'm wondering is the catalog on track zero? Is the zero track reserved to included a system (as track 0 & 1 are reserved to the system on a CP/M floppy disk, and catalog is on track 2)?

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• Strange Intermittent Background Sound in Windows 7

  - by NoCarrier

  Ok, this is very strange. Recently, i noticed that every 10-15 seconds, there would be this faint, annoying duh-dum sound coming out of my speakers. (hard to describe. sounds somewhat like the sound windows makes when you unplug a USB device, but not as pronounced and much quieter). I closed every app and ended as many processes as I could, but the sound persists. I look at the volume mixer and sure enough, when the sound occurs, there is a little spike in the level under "System Sounds". I haven't installed any hardware or software in the last several weeks. This started recently - completely out of the blue. Does anyone have any insight?

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• Why aren't there 8gb RAM modules yet?

  - by user49951

  Why is RAM module development seemingly stuck at the same size for a while now (a couple of years)? I bought 2x2gb modules 2 years ago, and now it's all the same size, with prices even bigger. I want more memory, because I work a lot on my computer and I just need it. What is going on? Hardware/memory progress was being made constantly until these couple of years, and I'm a big computer user for over 15 years. Why isn't here 4gb/8gb modules yet? I would gladly replace my DDR2 motherboard for a DDRX one if it had at least 4gb DDRX modules for a reasonable price. Now we have a situation with very cheap usb drives reaching 64gb size, and a ram modules with pathetic 2gb size. Sounds like some sort of conspiracy.

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• Would there be any problems with DEP turned off?

  - by IneedHelp

  I recently moved to a fresh Windows 8 x64 system and I learned that my favourite firewall (JPF - Jetico Personal Firewall) doesn't get along with Win8x64 (CRITICAL_STRUCTURE_CORRUPTION errors), but I can not do without JPF, so I kind of tried everything I could think of (test mode, debugging, various system changes), but I was still getting blue screens because of the firewall driver/software. I know for sure that it is the firewall that is causing the problems because I get blue screens as soon as I install it and they stop when I uninstall it. I Also tested it thoroughly on virtual computers. Anyway, I have discovered that by completely turning DEP off by using this command: bcdedit.exe /set {current} nx AlwaysOff the firewall would not cause blue screens anymore. So my question is, what could go wrong with DEP completely turned off? Note: I do not care much about hardware/windows security, I keep myself secured by using sandboxes and virtual computers (and I also have backups), so I'm not concerned with viruses and root kits or whatever people are freaking out about.

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• error when using OWA access to mail server exchange 2010

  - by e0594cn

  Suddenly it will come out the below error when accessing the exchange 2010 mail server using OWA after clicking sign in button on initial page? ***The website cannot display the page HTTP 500 Most likely causes: •The website is under maintenance. •The website has a programming error. What you can try: Refresh the page. Go back to the previous page. More information This error (HTTP 500 Internal Server Error) means that the website you are visiting had a server problem which prevented the webpage from displaying. For more information about HTTP errors, see Help.* Any suggestion? Thanks!

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• Windows 7 stopped booting

  - by jstawski

  I have a laptop which after shutdown it stopped booting. I tried repair, safe mode, and even start with Windows 7 Installation. The screen just goes blank with a mouse pointer that I can move around. I removed the harddrive from the laptop and connected it to my desktop using an External HD casing. The computer recognizes the disk, but it seems like it can't read it. If I go to My Computer it shows up, but it doesn't display usage information. When I double click on the drive it sits there as if it was loading something and eventually shows "G:\ is not accessible. The parameter is incorrect." Disk Management and Diskpart also take forever to load and when it does it shows the drive. My question, do you think this is a hardware problem or some corrupted sector? How can I try to fix the drive without formatting it? Thanks...

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• Very frequent "Server not found" messages

  - by Village

  Recently, while browsing and clicking or typing an address, I get: "Server not found", "Connection was reset", or a half-loaded page. Usually the page loads instantly after clicking reload, but this means I must reload on every page. Images on one site, but stored at a different server don't load until reloading for a second time. Clicking "submit" on many sites frequently doesn't work unless I reload many times. Sometimes sites load, but without colors and formating, appearing as if they would in Lynx. This seems to happen with every Web site. My Internet service claims everything on their end is fine. This happened a day after running an update in aptitude. I have not updated any hardware. I have tried clearing Iceweasel's cache. I do not have any router or other equipment. What could be going on? How can I troubleshoot this? PPPoE connection, Iceweasel 3.5.16, Debian 6

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• Do you think Microsoft is finally on the right track with its Windows 7?

  - by Saif Bechan

  It has been a while now since Windows 7 has been released. So far I didn't hear of many major complaints about it. I can remember the time that Windows Vista hist the shelves. There were major complaints from both experts and just regular users. I do a lot of OS installs for just regular users. These are mostly family and friends, and sometimes there are some customers. Up till now I mostly still use Windows XP SP3, because it is stable and most people are familiar with it. I did Vista for some users but they always call me back with all sorts of questions and in the end I had to downgrade them to XP. Do you think it is safe now to recommend Windows 7 as a good operating system? Offcourse their hardware has to support it, but let's say that is the case. If you install Windows 7 a lot for people, what are the complaints about if you get them?

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• how to switch played music when someone enters

  - by ymajoros

  My wife has a small shop, and she plays free licensed music. She can't legally play her own music when people outside of the family circle are present in the shop. How can I automatically switch music when someone enters? I was thinking of some bluetooth door detector and some custom software, but can't seem to find either. I'm a software architect/dev and can write it if necessary, but I'd prefer to use some existing solution. Any ideas on good hardware and software for this?

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• Software RAID underneath ESXi datastore

  - by carlpett

  I'm building an virtual environment for a small business. It is based around a single ESXi 5.1 host, which will host half a dozen or so VMs. I'm having some doubts regarding how to implement the storage though. I naturally want the datastore to be fault tolerant, but I can't get the funds for a separate storage machine, nor expensive hardware RAID solutions, so I would like to use some software RAID (lvm/mdadm, most likely). How can this be implemented? My only idea so far would be to create a VM which has the storage adapter as passthrough, puts some software RAID on top of the disks and then presents the resulting volumes "back" to the ESXi host which then creates a datastore from which other VMs get their storage presented. This does seem kind of round-about, do I have any better options? From my research, passthrough seems to come with quite a few drawbacks, such as no suspend/resume etc.

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• Sharing files between multiple computers?

  - by Koalatea

  At my school, we have 13 iMacs that we use to make our yearbook. Currently our school has some servers for us, but since we work with so many files ( thousands of pictures, most of which are ~3MB ) it slows down far too much. Is there a way to better share files between our computers? We are on a wireless network and the whole school shares the same servers, we have around probably 400 computers in the school. Is there a hardware fix I can do? Something like buying an external and hooking only yearbook computers to it?

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• How to run a command in a process that is not a child of the current process?

  - by amicitas

  I am having a library conflict issue with calling an external program from within a interpreted programming environment (IDL). The issue seems to be that since the program I am calling ends up as a child of IDL, libraries are not being reloaded. From within IDL I can launch sub-processes either directly or using a shell. Is there a good way that I can cause my program to be run without ending up as a child process? The only solution I have found so far is to use ssh localhost my_program. This works perfectly but I would like a more direct solution.

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• DH61AG's mythical 2 pin 19v power socket and is too low of votage bad?

  - by Nick Orton

  I have an intel dh61ag motherboard. It has an external 19v power adapter. It also has a 1x2 pin 19VDC internal power connector. Now I cannot find a psu or adapter or anything that will plug into this. In an intel forum, one person said that he plugged half of a 2x2 psu connector in and it worked. Since this would deliver 12v into a socket that asks for 19v, I suspect that this is a bad idea. I don't know much about hardware. Can anyone explain to me why this would be a bad idea?

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