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  • Nginx, Varnish, ESI - Will that work?

    - by Roland
    I've serveral backends (one is nginx+passenger) to combine via ESI. Since I don't want to go without gzip/deflate and SSL varnish can't do the job out of the box. So I thought about the following setup: http://img693.imageshack.us/img693/38/esinginx.png What do you think? overkill?

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  • Dual monitors through 1 HDMI port

    - by Carlos
    I currently have a Dell Studio XPS 13 laptop connected to a 24" HP monitor (w2448hc). Im thinking on getting a second one, however am wondering what i need for the setup (hardware wise). Also I was wondering it there is any down side to it, or something i should be aware of. For example, image quality loss, GPU overloading, or anything important I should know. More than anything Im interested in your advice. Also the monitors do have built in speakers (HDMI sound output), is the sound going to be reproduced by only one monitor or both? Specs Model: Dell Studio XPS 13 OS: Genuine Windows® 7 Home Premium 64-Bit CPU: Intel® CoreTM 2 Duo P8600 (2.4GHz, 3MB L2 Cache, 1067MHz FSB) Chipset: NVIDIA® GeForce® MCP79MX RAM: 4GB 1067MHz DDR3 SDRAM Graphics: SLi NVIDIA® GeForce® 9500M - 256MB Thanks for your advice, if there is anything additional i need to buy an you have a personal preference pass the brand name so i can check it out. Thanks!

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  • Dual monitors though 1 HDMI port

    - by Carlos
    I currently have a Dell Studio XPS 13 laptop connected to a 24" HP monitor (w2448hc). Im thinking on getting a second one, however am wondering what i need for the setup (hardware wise). Also I was wondering it there is any down side to it, or something i should be aware of. For example, image quality loss, GPU overloading, or anything important I should know. More than anything Im interested in your advice. Also the monitors do have built in speakers (HDMI sound output), is the sound going to be reproduced by only one monitor or both? Specs Model: Dell Studio XPS 13 OS: Genuine Windows® 7 Home Premium 64-Bit CPU: Intel® CoreTM 2 Duo P8600 (2.4GHz, 3MB L2 Cache, 1067MHz FSB) Chipset: NVIDIA® GeForce® MCP79MX RAM: 4GB 1067MHz DDR3 SDRAM Graphics: SLi NVIDIA® GeForce® 9500M - 256MB Thanks for your advice, if there is anything additional i need to buy an you have a personal preference pass the brand name so i can check it out. Thanks!

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  • Must partprobe before using drive?

    - by Jeff Welling
    This is a followup question to Cannot mount /dev/sdc1 on Debian 5.0, special device /dev/sdc1 doesn't exist Basically, I have 6 SATA hard drives in a machine and I'm trying to create a RAID6 array with them. When I try to run the mdadm command to create (with the verbose option) a raid array, I see messages like "mdadm: super1.x cannot open /dev/sdf1: No such device or address" which are resolved by doing partprobe /dev/sdf and then re-running the mdadm command. The problem is that I have to run partprobe after each reboot, and from experience I don't think this is normal behaviour -- on no other linux machine do I have to partprobe the device before I can use it. Something must be going wrong, but how do I troubleshoot this to find out what? Could this be caused by a hardware problem? Edit: Additional note - before I seemed to only have this problem with one drive, but now I'm having it with 3 drives.

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  • Is there any multi-touch graphics tablet with Linux drivers?

    - by Zifre
    After watching the absolutely amazing 10/GUI video, I have been dying to try to implement something like this. I can do the software side quite easily, but I don't have the hardware. The Wacom Bamboo Fun would work, but the Linux drivers don't support the multi-touch features. Microsoft's "UnMouse Pad" looks like the perfect solution, but it is not commercially available yet. Are there any similar devices that would work? Alternatively, is there a way to build a DIY version? (It is fairly easy to build a multi-touch display with a webcam and IR LEDs, but it would not be pressure sensitive. Does anyone have any info on how the UnMouse Pad works and if it is possible to build one?) EDIT: I should clarify that I don't want a multi-touch display. I want the sensor to be separate from the display. If that sounds crazy, watch the 10/GUI video.

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  • Laptop HDD failure imminent?

    - by Andrei Rinea
    I have an HP Compaq 615 laptop with an 160 GB 7200 rpm HDD. Hasn't been dropped or shaken, in fact it almost always stayed on my desk. I've treated it as nice as I could. The other day, however, my OS froze and I could hear a repeated clink-clink-clink coming from the HDD zone of the laptop. I had to switch off hardware-ly the laptop and re-start it. It worked very well after, including now. However I backed up immediately the core data on my USB drive and ordered an external USB HDD for periodic backups. Will it die soon or it was just a "blip"?

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  • How can I make it difficult to install a new operating system on a certain computer?

    - by D W
    I want to host a website on a desktop computer running Ubuntu with a Windows virtual machine. I will give away the computer in exchange for a number of months of remote web hosting. I want to add some kind of lock (hardware or otherwise) so that the end users will have difficulty just reinstalling Windows and using the machine as they want, in contradiction to the contract. Ideally, I'd want the machine to die if reinstallation of the OS is attempted. It doesn't have to be completely insurmountable, but it has to be difficult enough to prevent casual reinstallation. Perhaps on bootup the system can check whether certain files exist on the computer and refuse to boot if they do not. I don't know if this is possible, but maybe BIOS is password protected, and searches for files before boot up. The files it looks for could be date sensitive, i.e. require remote replacement on a schedule.

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  • Defragment an Exchange Volume

    - by IceMage
    The Scenario: I use a dedicated volume (RAID volume) to store all of my data for my Exchange 2007 server. Today, out of curiosity, I decided to check up on how fragmented the files on this data volume were. To my surprise, the answer is extremely. So, a three part question: First and Foremost, SHOULD I defragment this volume (after a full backup of course)? Be specific as to why not if I should not, or reasons I absolutely should if I should. Second, about how much time should I allow for during this maintenance period per gigabyte. The drives are all 7200 RPM SATA drives on a Hardware RAID 5 controller (Perc 5i/6i, can't remember), the files are extremely fragmented. (Over 5000 file fragments per gigabyte). Third, is there something wrong here? It seems to me like the drive shouldn't be this fragmented. Could something be configured incorrectly that could be causing this to happen?

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  • Is anybody using Splunk in a large-scale production environment?

    - by Nano Taboada
    I've been watching the videos at splunk.com and really it's hard to believe that one can get all those features for free, there's still that "where's the catch?" in the back of my head. So it'd be great if anybody that is actually using it Splunk on production would like to share their experiences, perhaps highlighting its benefits over, say, Nagios? Thanks much in advance.

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  • Opscode Chef nginx compile from source issue reports successful run but does nothing

    - by v_abhi_v
    I am trying to install nginx from source in Opscode Chef and its bit weird, it runs complaining nothing but does not install it either. This is how my role attributes look like looks like "nginx":{ "default_site_enabled":false, "version":"1.2.6", "init_style":"init", "install_method":"source", "configure_flags":[ "--without-http_access_module", "--without-http_auth_basic_module", "--without-http_autoindex_module", "--without-http_browser_module", "--without-http_charset_module", "--without-http_fastcgi_module", "--without-http_memcached_module", "--without-http_referer_module", "--without-http_scgi_module", "--without-http_split_clients_module" ], "log_dir":"/var/log/nginx", "binary":"/opt/nginx/sbin/nginx", "source":{ "prefix":"/opt/nginx/dist", "modules":["http_ssl_module", "http_gzip_static_module" ] } }, The chef log shows: [2012-12-19T02:37:44+00:00] INFO: Processing bash[compile_nginx_source] action run (nginx::source line 82) [2012-12-19T02:37:45+00:00] INFO: bash[compile_nginx_source] ran successfully I am clueless on what's going on :(

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  • Freezing of computer while watching flash videos (contd)

    - by t3st
    I have asked this similar question Computer freezing while watching Flash videos from net two week before. As i mentioned in my previous problem my computer freezes while watching online videos showing 100% cpu usage. I have tried the suggestions given in that query and I have formated my whole computer and installed windows and other softwares (with latest updates) but the problem still presisting. If i watch a video online approximately after one hour my system shows very high cpu usage and when i close my browser cpu usage comes to normal(i tried to watch Cybergeddon but my computer is freezing from start,and also other youtube videos). Can you tell me whether its an hardware problem? if yes can you give any possible explanation( eg:motherboard problem,over heating etc) because i want to tell those reasons to my computer mechanic.

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  • Mecer laptop gives me a white screen when I close the screen

    - by Dane Rossenrode
    I'm having a very strange hardware issue with my Mecer m770u laptop with intel i7 quad core, etc... I'm wondering if anyone has had this issue with any other brand/model of laptop, and what I should fix/replace to solve it...? Basically when I close the screen of the laptop, the screen often goes completely white. If I open it slowly and smoothly again, the screen returns to normal. But if I close the screen when the computer is off, and then switch it on, it boots with a white screen, and opening it slowly/smoothly doesn't help. I have to then switch it on and off a few times before it returns to normal. Makes travelling with my laptop really difficult! Any suggestions?

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  • How to handle server failure in an n-tier architecture?

    - by andy
    Imagine I have an n-tier architecture in an auto-scaled cloud environment with say: a load balancer in a failover pair reverse proxy tier web app tier db tier Each tier needs to connect to the instances in the tier below. What are the standard ways of connecting tiers to make them resilient to failure of nodes in each tier? i.e. how does each tier get the IP addresses of each node in the tier below? For example if all reverse proxies should route traffic to all web app nodes, how could they be set up so that they don't send traffic to dead web app nodes, and so that when new web app nodes are brought online they can send traffic to it? I could run an agent that would update all the configs to all the nodes, but it seems inefficient. I could put an LB pair between each tier, so the tier above only needs to connect to the load balancers, but how do I handle the problem of the LBs dying? This just seems to shunt the problem of tier A needing to know the IPs of all nodes in tier B, to all nodes in tier A needing to know the IPs of all LBs between tiers A and B. For some applications, they can implement retry logic if they contact a node in the tier below that doesn't respond, but is there any way that some middleware could direct traffic to only live nodes in the following tier? If I was hosting on AWS I could use an ELB between tiers, but I want to know how I could achieve the same functionality myself. I've read (briefly) about heartbeat and keepalived - are these relevant here? What are the virtual IPs they talk about and how are they managed? Are there still single points of failure using them?

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  • In a multi-domain forest, what EXACTLY happens when some, but not all, of the Infrastructure Masters are on Global Catalogs?

    - by MDMarra
    There are plenty of TechNet articles, like this one that say that phantom object don't get updated if an Infrastructure Master is also a Global Catalog, but other than that there isn't a lot of in depth information on what actually happens in this configuration. Imagine a configuration like this: |--------------| | example.com | | | | dedicated IM | |--------------| | | | |-------------------| | child.example.com | | | | IM on a GC | |-------------------| Where child has two DCs that are both global catalogs, meaning that the Infrastructure Master role is on a GC. And, example has three DCs with the Infrastructure Master role on a DC that is not a GC. I understand that it's usually best to just make everything a GC and not have to worry about this sort of thing, but assuming that's not the case - what is the exact error behavior that can be expected from a setup like this, and which domain(s) would this behavior manifest in? The child or the parent?

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  • What is this component?

    - by bAN
    Hi everyone, i'm just looking an old mother board waiting for my favorite TVShow and and i wonder what's this component? Every motherboard i've seen have this kind of solenoid (I am sure that you already settled this question). But what is this? What is his function? If an hardware specialist can try to answer my question.. I will be an happy man.. I join a Picture.. Strange and mystic kind of solenoid.

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  • Are mobo raid controllers based on Intel ICH10R southbridge still considered software Raid?

    - by Breadtruck
    So do you still need specific software/drivers (intel matrix?) installed to manage the raid controller, setup the array. If the raid chipset is on-board the motherboard and it uses the CPU, and say I am using a Core 2 Quad Q9550, would a hardware based card still out perform the motherboard chipset? This is for a home workstation and I could spend $300 on a areca ARC-1210 PCI-Express x8 SATA II but I want to be able to justify the money for the raid card. My motherboard is a GIGABYTE GA-EP45-UD3P UPDATE: I was going to RAID5 using 4 500 GB drives, and I was going to buy a controller card but this article got me thinking hmmm....Toms-Southbridge Battle

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  • Plesk directory structure problems

    - by johnnietheblack
    I have an entire website with the following directory structure: /example.com /html (public) /css /js index.php /lib session.php other_lib_files.php /views index.php /models /controllers As illustrated, the html is public, and anything above it is private. My site now needs to upgrade servers, and the new server (Linux w/ Plesk) has the following structure (reduced to the problematic parts below): /myplesksite.com /httpdocs /css /js index.php /private /lib /models /views What I would THINK is that I should be able to put my /lib, /views, /models, etc in the directory directly above /httpdocs, the same way I had it in my previous server. Is that possible? Or do I have to put it in private? I would really love not to have to adjust my internal paths throughout the site if not necessary...

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  • How to recover from a drive failure in a RAID 5 configuration?

    - by Philip Fourie
    This morning a drive failed on our database server. The drive array (3 disks) is setup in a RAID 5 configuration. While we wait for a drive replacement we are preparing for a recovery strategy. Users are continuing to work on the system, albeit very slowly (don't know why??). How does one install the new drive - will the data for this drive automatically be rebuilt from the parity or is there another process we should follow? Edit: This is a hardware RAID controller. (Thanks for the answers so far, appreciated)

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  • Small Business HP Virtualisation and iSCSI SAN Options

    - by Robin Day
    We are a small business that hosts our core product on a number of HP servers. Our core production setup is 1x HP DL380, high powered for a SQL Server Database 1x HP DL360, mid powered for our core application server 6x HP DL320, low powered for our front ends We run our training / testing / support systems on a similar setup, the servers are just older and less powerful. Unfortunately this is now causing us issues as the system has grown beyond the capabilities of these older servers. Upgrading these servers would be expensive and we believe that virtualisation is probably the way to go for the future. Locally we run a number of test / dev environments on ESXi using Direct Storoage on a couple of high powered DL360's and these are performing fairly well. We're thinking that instead of replacing all of our test servers that we can implement an iSCSI SAN and one or two high powered hosts. Hopefully looking that when it comes to replace our live servers as well that we can just expand the virual environment to cope. So my question is... Can anyone offer any advice on some suitable options? We have generally always been extremely happy with HP servers, all of our kit is currently HP, therefore our preference would be to stick with HP, however, I'm always happy to hear about other options. I'm hoping that initially a budget of around 15-25k (GBP) would be suitable, this could potentially be increased if I had confidence that the system would pave the way for a cost effective upgrade of our live systems in the future as well. I am new to SAN's and my only real experience is playing with OpenFiler on some old desktops. I think iSCSI should be suitable, but I've not done any research into how SQL server may perform. I've had a browser through HP's sites and see plenty of information about EVA, MSA, LeftHand, etc. However, from looking at all that, I don't see which options would be best and more importantly I don't know exactly what I would need to buy. Any help, links, opinions would be much appreciated. Thanks

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  • How can I recover [data from] my failing USB key?

    - by moe37x3
    I have a Corsair Flash Voyager USB key, and it's almost completely failed. When I plug it into my [WinXP] computer, the OS mounts it and open up explorer to the drive's root directory. However, if I try to copy any data off, I get an error message saying that the device is not there. If I leave it plugged in, the OS seems to oscillate between seeing it and not seeing it, since the "Safely Remove Hardware" tray icon appears and disappears every few seconds. The damage was probably caused by my abuse, either from plugging it in with my keys hanging off of it or from losing the cap and keeping it in my pocket uncapped. Is there anything I can do to save the data from it or even rehabilitate the drive?

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  • Internal LTO tape drive becomes hot

    - by claasz
    We use an internal LTO3 tape drive (HP Ultrium 920) in a PC (no particular server hardware) running Linux. The tape drive becomes quite hot - I don't have the exact temperature, but you may touch it for a second or two, then it hurts ;-) This happens when the tape has nothing to do (during reading/writing, it might become even hotter, I haven't checked that). Besides that, the system is working fine. Now I'm wondering Why does the tape becomes so hot? Is this something I need to care about? Is there something like a 'standby' mode for the tape? (I think it should not consume that much energy when it is not used)

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  • OpenGL support no longer available

    - by Aznfin
    I've been using OpenGL hardware acceleration in programs such as Adobe Photoshop CS4 and Adobe After Effects CS4. I've noticed that recently the options for OpenGL previews are disabled because my graphics card seems to not support OpenGL. But that doesn't make any sense whatsoever. I know for a fact that my graphics card does have support for OpenGL and it worked before. I checked for driver updates just the other day. Anybody know what's going on? Info: Operating System: Windows 7 Home Premium 64-bit GPU: ATI Radeon HD 3200 Driver Packaging Version: 8.69-091211a-094296C-ATI Catalyst™ Version: 09.12 Provider: ATI Technologies Inc. 2D Driver Version: 8.01.01.994 2D Driver File Path: /REGISTRY/MACHINE/SYSTEM/ControlSet001/Control/CLASS /{4D36E968-E325-11CE-BFC1-08002BE10318}/0000 Direct3D Version: 8.14.10.0723 OpenGL Version: 6.14.10.9252 Catalyst™ Control Center Version: 2009.1211.1547.28237

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  • BT socket Device over Structured Cabling

    - by TheD
    Not sure if this is the right stack* site to post on but I believe cabling is a just subject. Essentially I have a Credit Card machine which is connected to a phone line via standard BT Socket. So basically, the port of the wall has a balun plugged in which takes the RJ45 outlet on the wall to BT, so I can plug the device in. This works fine, however I need the machine to be on the other side of the room so want to route it through my patch panel (strucutered cabling). How can this be done? So Device -- ? -- RJ45 port -- Patch Panel -- ? -- Balun out wall outlet Where ? is to be filled in ! :)

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  • Creating an office network and monitoring all activity without a proxy

    - by Robert
    We are setting up our office network and would like to track all the websites visited by our employees. However, we would not like to use any proxy based solutions. Our work is highly dependent on applications in which you cannot configure a proxy. Hence, the approach we would like to follow is setting up a router inside a computer (something like this : http://www.techrepublic.com/article/configure-windows-server-2003-to-act-as-a-router/5844624) This will also allow us to attach multiple ethernet cards and have redundancy in internet connectivity with complete abstraction from the user about which connection is being used. But most importantly, since all the traffic will be going through the computer (configured as a router) I assume there will be a way to run packet analysis on all the request / responses being made. For example, list all the FTP servers connected to (port 21), give a graph of all the URLs visited per day by frequency. Is there already a software which does this ? Or is it possible to build something like this ?

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