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  • Is minimum latency fixed by the speed of light?

    - by JavaRocky
    Suppose i had a fiber optic link from one side of the planet to the other side of the planet. Is it safe to say, that with current technology, the latency of communication can never be reduced? Understand that a fiber optic cable is not a perfect medium thus data only travels close to the speed of light. Also lets consider that i will not be drilling a hole thru the center of the earth and it is just running along the ocean.

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  • Lefthand SAN questions.

    - by Gk
    I'm curious about Lefthand SAN solutions from HP. People from Dell have told me that Lefthand SAN's require at least two nodes and data must be mirroring between them so capacity is a half less compare to other SAN technology (e.g.Equal Logic). Is it true? Can a HP lefhand SAN be used as a stand-alone storage server with full RAID function (1, 10, 5)? TIA, -giobuon

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  • Get 5.1 surround sound from computer through a VCR config?

    - by Wedding Nails
    I'm posting to see if my idea of this setup is right and can be done. I currently have the following "equipment": a JVC VCR -quite old-, which has built in surround sound (aka it has several speaker outputs, which I believe is 5.1 and are connected to several speakers that are in every corner of the room), a computer with SPDIF optical output and a new flat screen TV (with built in HDMI). I want the computer to take advantage of the VCR's surround system (all the speakers in the room) in order to play mainly music and video always with all the speakers (5.1) and with the maximum sound quality. Currently, the computer plays sound only through the front speaker (I connect one output to the on board pc audio input) and the quality is really bad. As a side note, the computer video runs with S-video (old school), and the picture quality as you would imagine, is really bad with the new big LCD screen. My main goals are: to upgrade the picture with a new video card which would support HDMI (my tv has HDMI). to buy a SPDIF optical cable, connect one end to the VCR SPDIF input and the other end to the PC output This is theoretically what I've researched so far, and I came out with several questions: in this case, with the SPDIF cable connected, and all the configurations done in windows allowing the 5.1, will I get every content I play "converted" or played through all of my speakers? (I read this forum post). I already know that in order for this setup to play from all the speakers, the content/audio source has to be 5.1. but my question is, if there is a way to play from all of the speakers no matter what type of content I'm playing (that's why I said conversion there) I already know that HDMI cables carry digital sound. Is there a way I can only use said HDMI cord to the tv, and get sound through the VCR? (I'm not too sure about this, I would have to disable the TVs speakers and use the VCR surround as default, but I have no clue wether this can be done or not). Update: The ultimate question is, do I really have to rely on "sound virtualization" technology to get sound from all the speakers, no matter what content I play? (do I require a newer sound card, like a creative soundblaster with said technology?) Thanks!

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  • database scanning tools recommendation?

    - by stock99
    Lately my boss is asking me to looking into database scanners. I know very little about db scanning technology. Just wondering if it is worth to purchase tools like Sentrigo ( http://www.mcafee.com/us/about/sentrigo.aspx ) ? Does anyone have experience of using database scanner? Also, I'd like to know if there is any limitation on it. We already conducting internal OS and web scan on regular basis, by the way.

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  • What good Sysadmin podcasts are out there?

    - by Zoredache
    The similar question on SO #1644 has lots of answers focused on software development. What do podcasts do you listen to for learning about Information technology trends Network Administration techniques Security Issues and threats Other system/network administration issues.

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  • Lefthand SAN quetions.

    - by Gk
    I'm curios about Lefthand SAN solution from HP. Ppl from Dell told me that lefthand SAN require at least two nodes and data must be mirroring between them so capacity is a half less compare to other SAN technology (e.g.Equal Logic). Is it true? Can a HP lefhand SAN can use as a stand-alone storage server with full RAID function (1, 10, 5)? TIA, -giobuon

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  • Why do Linux networks use Samba?

    - by Dougal
    The "file and printer sharing" feature of Linux distros is mostly Samba. Samba is an interpretation of Microsoft's network filesystem. Cross-OS compatibility is important of course but why are Linux systems defaulting to this Microsoft technology? Is Microsoft's network filesystem so good? Samba clearly works very well and I'm not "dissing" it. Or, to rephrase the question, "What would be a Linux-native way to share files and printers across a network?"

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  • Debugging IO limitation

    - by Martin F
    I have a Fedora box with some severe IO limitations which I have no idea how to debug. The server has a Areca Technology Corp. ARC-1130 12-Port PCI-X to SATA RAID Controller with 12 7200 RPM 1.5 TB disks and a Marvell Technology Group Ltd. 88E8050 PCI-E ASF Gigabit Ethernet Controller. uname -a output: 2.6.32.11-99.fc12.x86_64 #1 SMP Mon Apr 5 19:59:38 UTC 2010 x86_64 x86_64 x86_64 GNU/Linux The server is a file server running Nginx with the stub status module enabled, so I can see the current amount of connections. The problem present itself when I have a high number of simultaneous connections in a writing state. Usually around 350, at this very moment it's at 590 and the server is almost unusable and stuck at 230mbit/s. If I run stop and hit 1 to see CPU core usages I have all 4 cores with around 99% io wait, if I run iotop the nginx workers are the only processes producing any read load, currently at around 25MB/s. I have each of the workers bound to their own core. Initially I figured it was just the disks being bugged. But I've run fscheck and smartmontools checks and found no errors. I also ran an iozone test which you can see the result of here: http://www.pastie.org/951667.txt?key=fimcvljulnuqy2dcdxa Additionally, when the amount of connections are low I have no problem getting a good speed. If I wget over the local network it easily hits 60MB/sec. Right now I just tried putting a file in /dev/shm, then I symlinked a file from the public dir to it and used wget over the local network and only got 50KB/s. Also, if I try to cp /dev/shm/test /root/test it quickly copies around 740MB and then slows down HEAVILY. Again with iotop reporting 99% iowait. I'm not really sure how to go about figuring out what the problems are. It could be a natural disk limitation but then the file from /dev/shm ought to transfer so it seems there's a network limit, but that's fine when there's not many connections. Perhaps it's a TCP stack problem but I really have no idea how to check that. Any suggestions on how to proceed with debugging would be very welcome. If additional information is required then let me know and I'll try to get it. Thanks.

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  • How is a VM isolated from the physical host?

    - by dotnetdev
    Hi, I was thinking about virtualisation and how to explain it to a non-technical person and one of the things that I was wondering was how to explain the way that a VM is isolated and seperate from the phyiscal machine (so I can have a virus on a VM but this would never effect my physical host, right?). How does this technology work exactly? As I am a programmer, when I think of isolating processes, I think of using appdomains (I work with C# primarily). Thanks

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  • S.M.A.R.T. Hard drive failure test?

    - by mandroid
    I'm working on my mom's computer and she freaked because it told her "There was an imminent hard drive failure about to occurr." I did some digging and found it was related to the S.M.A.R.T. technology in the hard drive. The message appears every time you boot, but it will still let you boot into Windows and every thing seems fine. How serious are these warning messages? Do we really need to immediately replace the hard drive?

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  • how does a web application cope with thousands of requests?

    - by netrox
    I went to a few websites and noticed that they all use AJAX technology for many tasks such as chat, messages, and so forth. They use a lot of httprequests obviously. My question is if you build a simple website using AJAX and you expected only few people per hour and then you start to have like 1,000 members logged per hour - can a single web application handle more requests per hour if you just upgrade to faster bigger servers or do you have to rewrite the code? Exactly how do you "scale" the web application?

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  • Storage and bandwidth for a social network

    - by user38141
    I guess i asked a dumb question earlier. I am fairly new at this. I have a socal network being built in PHP wit MYsql. I was wondering how much bandwidth and storage would allow users to have have 500mins of streaming video and allow them to store photos and videos. Please forgive me. I am not a technology guy and just doing some research as I am learning as I go along.

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  • What is the Worst Depiction of Computer Use in a Movie

    - by Robert Cartaino
    You know the type: "It's a Unix system. I know this" -- in Jurassic park where a computer-genius girl sees a computer and quickly takes over like a 3-D video game, flying through the file system to shut down the park. [video link to the scene] So what's your favorite movie gaff that shows Hollywood can be completely clueless when it comes to portraying technology?

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  • Is a chill-pad necessary for a laptop similar to the ASUS K73E?

    - by leeand00
    Cooling fan necessary for a laptop similar to the ASUS K73E? I'm not entirely sure about this, after working with one the other day for a client, it seemed like it was running pretty cool, but I'm not sure if the computer was actually running cool or if it had more to do with IceCool Technology feature that keeps the mouse and palm rest area cool. The bottom of the laptop didn't seem very warm either...does anyone have any experience with the ASUS K73E where the thing burned up with normal usage?

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  • Squid authentication encryption

    - by barbarossa12d
    Hi, I use Squid and the users must authenticate. The users are authenticating in cleartext. I found tutorials about stunnel (http://www.jeffyestrumskas.com/?page_id=3), but the clients also need this software. Is there no possibility that for user authentication SSL (or some other encryption technology) can be used?. Thanks.

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  • SSD and intel i5 lagging

    - by Marek Javurek
    my "new" notebook has some really wierd lags during work, youtube video etc etc... Sometimes it has bluescreen during booting, sometimes after reboot. All my drivers are updated and SSD firmware too. this is my notebook parameters: Operating System MS Windows 7 64-bit SP1 CPU Intel Core i5 @ 2.40GHz: 57 °C Sandy Bridge 32nm Technology RAM 8,00 GB Dual-Channel DDR3 @ 665MHz (9-9-9-24) Motherboard LENOVO 12985VG (CPU): 58 °C Graphics SyncMaster (1680x1050@60Hz) AMD Radeon HD 6630M Series (Lenovo) Hard Drives 125GB Crucial M4-CT128M4SSD1 ATA Device (SATA-SSD) full specs here: http://speccy.piriform.com/results/Khr265gWVgk6vKTMrhdfhlS

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  • http benchmarking?

    - by Sam Williams
    im running varnish-nginx(php-fpm) and im using ab but it keeps messing up. [root@localhost src]# ab -k -n 100000 -c 750 http://192.168.135.12/index.php This is ApacheBench, Version 2.0.40-dev <$Revision: 1.146 $> apache-2.0 Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/ Copyright 2006 The Apache Software Foundation, http://www.apache.org/ Benchmarking 192.168.135.12 (be patient) apr_socket_recv: Connection reset by peer (104) is there anything else i can use? or am i doing it wrong?

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  • How do you google bad reviews? [closed]

    - by zlog
    The first thing I like to do before I make technology choices or gadget purchases is find bad reviews of the things. That way, taking into consideration of the potential biases of the reviewer, I can evaluate the product/service for the worse it can be. How do people google (or search in general) for bad reviews? I usually just try googling "bad review [product/service]" or "[product/service] sucks", but I'm sure there are better ways.

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  • ubuntu and laptops or mini-laptops

    - by doug
    Hi here I'm planing to buy a laptop or mini-laptop and use a Ubuntu OS on it. The thing is that i really need it to use it many hours on batery mode. I'm thinking that i'll have troubles in finding the right rivers and my batery to be waisted. What other problems can I have? Also, I wana use the laptop or mini-laptop outside/outdoor. What display technology is most recommended for that?

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  • Free or inexpensive compression proxy

    - by Maksee
    Hi, I'm looking for a way to minimize the net traffic use with my netbook mobile internet connection. Recently I managed to install Opera Mini on the XP and the opera approach of compressing the data helped a lot. But I would like to do the same with my favorite browser using http proxy that compress the data "on the fly". But searching for "compression proxy servers" I could not find any working host/port links. Is it a brand-new technology and therefore expensive or rarely available?

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