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• Amazon EC2 as load balanced/failover solution

  - by sugiggs

  Hi All, I'm thinking of an idea but not sure the pros/cons of it. At the moment, we are hosting our website on a dedicated server. As a failover/load balanced solution, I'm thinking to use Amazon EC2+EBS. The files can be rsync and mysql can be setup as master-master replication When the load is high, I can up the machine, given sometime to "sync" and load balanced the traffic there. is it do-able? any link I can read more on this?

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• I need an other videocard to replace my ATI HD 5870 which one is good? [closed]

  - by Chris

  At this moment I have a ATI HD 5870 iCooler 5 and I game a lot. I want to replace the card for another, I don't have room in my case to add another 5870. I mainly play games like Battlefield 3, but I can't play this game on Ultra high, for me is this pretty important. So here are my questions: Price is not an issue because computers are a big hobby to me and hobbies cost money :-) Can anyone recommend me a better card, ATI or Nvidia does not mather to me. Why is this card better?

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• If a SQL Server Replication Distributor and Subscriber are on the same server, should a PUSH or PULL subsciption be used?

  - by userx

  Thanks in advance for any help. I'm setting up a new Microsoft SQL Server replication and I have the Distributor and Subscriber running on the same server. The Publisher is on a remote server (as it is a production database and MS recommends that for high volumes, the Distributor should be remote). I don't know much about the inner workings of PUSH vs PULL subscriptions, but my gut tells me that a PUSH subscription would be less resource intensive because (1) the Distributor is already remote, so this shouldn't negatively effect the Publisher and (2) pushing the transactions from the Distributor to the Subscriber is more efficient than the Subscriber polling the Distribution database. Does any one have any resources or insight into PUSH vs PULL which would recommend one over the other? Is there really going to be that big of a difference in performance / reliability / security?

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• games and movies become too slow after some time

  - by ishaq

  On my gaming desktop, I was fixing my desktop's power supply when something seemed to burn (I got that stinging burning smell). However when I turned ON the computer (it was OFF before), everything seemed to be fine. However, I have noticed that now it becomes too slow if I play a game or movie on it. I am talking about the computer becoming painfully slow after about 5 minutes into the movie/game (it works fine otherwise e.g. browsing), it becomes so slow I can see individual frames from movies/games. What could be the problem? A fried video card? friend memory (RAM), something else? My system's configuration is: Intel Core i7 CPU 3.40GHz 8GB DDR3 RAM 2TB WDC HDD NVIDIA GeForece GT 220 (1GB) Thermal Take Commander MS1 Chassis ( http://www.thermaltakeusa.com/Product.aspx?S=1394&ID=2051 ) mainboard: Intel DH67CL AAG10212-208 Realtek High Definition Audio

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• Straight-forward to Virtualise with XEN or KVM on IBM Server System x3650 M4 791562G?

  - by ChrisZZ

  I want to built a virtualised Server Environment using XEN or KVM. The virtual machines should be purely debian systems - so XEN or KVM should be a sane choice. Now while buying servers, I am confronted with the fact, that the vendors obviously only support commercial solution. I think, on a good server, one should be able to install uncommercial software as well - but of course sometimes systems have hardware, that requires drivers, that are not found in the OS Community. So I am asked the question: Is it straight-forward to use Debian with IBM Server System x3650 M4 791562G with Debian - or even virtualising the IBM Server System x3650 M4 791562G using XEN or KVM. I am sure there will always be a way to achieve this goal - but this way might have a high milage - so I am not asking, whether this is theoretical possible, but whether this should be straight-forward and practically easy to do, no major headaches to be expected.

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• Auto restart server if virtual memory is too low

  - by Sukhjinder Singh

  There are quite number of software running on my server: httpd, varnish, mysql, memcache, java.. Each of them is using a part of the virtual memory and varnish was configured to be allocated 3GB of memory to run. Due to high traffic load which is 100K, our server ran out of memory and oom-killer is invoked. We've to reboot the server. We have 8GB of Virtual Memory and due to some reason we cannot extend to larger memory. My question is - Is there any automated script, which will monitor how much virtual memory left and based upon certain criteria, lets say if 500MB left than restart the server automatically? I do know this is not the proper solution but we have to do it, otherwise we don't know when server will get OOM and by the time we know and restart the server, we lost our visiting users.

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• 100% CPU in QuickTime H.264 decoder on Windows on Win7, except when using XP compat. mode

  - by user858518

  I have a Windows program that uses the Apple QuickTime API to play video. On Windows 7, CPU usage is 100% on one core, which I believe is why the playback is choppy. If I turn on XP compatibility mode for this program, the CPU usage is around 20% of one core, and playback is normal. Using a profiling tool called Very Sleepy (http://www.codersnotes.com/sleepy), I was able to narrow down the high CPU usage to a function in the QuickTime H.264 decoder called JVTCompComponentDispatch. I can't imagine why there would be a difference in CPU usage when XP compatibility mode is turned off or on. Any ideas?

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• How many nginx/fastcgi processes do you use?

  - by qliq

  I have a drupal-based website on a VPS with 1GB RAM and 1Ghz processor share. The webserver is nginx along with php-fastcgi. Currently I am using 10 nginx and 13 php-fastcgi processes. The server load is high most of the times while half of the RAM is unused. The CPU usage rarely reaches 80%. I have tried some other combinations of nginx/php-fastcgi but am not sure what is the optimal combination because I am quite ignorant about what's going on below the surface. So I appreciate if you could share your experience or give me some clues.

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• FFMPEG settings for Youtube and facebook video uploads

  - by eco_bach

  Can any FFMPEG experts share their preferred settings for video conversion to both Youtube and Facebook? For youtube I am following these guidelines and my video size is 480P @ 24 fps Audio Codec: AAC-LC Channels: Stereo or Stereo + 5.1<br> Sample rate 96khz or 48 khz<br> Video Codec: H.264 Progressive scan (no interlacing)<br> High Profile<br> 2 consecutive B frames<br> Closed GOP. GOP of half the frame rate.<br> CABAC<br> Variable bitrate. No bitrate limit required Color Space: 4.2.0 http://support.google.com/youtube/bin/static.py?hl=en&topic=1728573&guide=1728585&page=guide.cs

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• In a virtual machine monitor such as VMware’s ESXi Server, how are shadow page tables implemented?

  - by ali01

  My understanding is that VMMs such as VMware's ESXi Server maintain shadow page tables to map virtual page addresses of guest operating systems directly to machine (hardware) addresses. I've been told that shadow page tables are then used directly by the processor's paging hardware to allow memory access in the VM to execute without translation overhead. I would like to understand a bit more about how the shadow page table mechanism works in a VMM. Is my high level understanding above correct? What kind of data structures are used in the implementation of shadow page tables? What is the flow of control from the guest operating system all the way to the hardware? How are memory access translations made for a guest operating system before its shadow page table is populated? How is page sharing supported? Short of straight up reading the source code of an open source VMM, what resources can I look into to learn more about hardware virtualization?

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• How to get a windows domain server to recognize a linux machine by its name?

  - by CaCl

  In my company I ran into an issue where we have a linux machine that serves up a Subversion repository. Its hooked up via LDAP to the Active Directory. We got an account setup for an application and they set the Limited Workstations up so it didn't have full access to the network. The problem is that even though the hostname for our machine resolves correctly for me, the credentials for the application account seem to come back as not being allowed based on the name (the error was related to authorized workstations). I don't have access to any of the domain servers but it might be helpful to come at the management or high-level techs with some ideas, they don't seem to have a solution besides allowing all workstations for the user. Does anyone have any idea on how to get my linux machine to properly identify itself with the Domain machine by name?

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• Specific apache + mysql settings for a light-weight site

  - by Good Person

  I have a small website with a Joomla and a Moodle set up. It seems that both of these are very slow. The server (CentOS release 5.5 (Final)) is a virtual dedicated server with about 2GB of ram. I don't expect to ever get more than 10-15 people on at the same time (and if that is high) What settings could I change in either apache, mysql, or even the OS to increase the performance of my site? I'm not concerned about running out of resources if I get too many visitors. If you need more specific data leave a comment and I'll edit the question.

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• Prevent specific applications from being run as administrator

  - by Unsigned

  Background Most installation toolkits have the ability to launch, automatically or otherwise, external programs after installation. This is often appears in the installer via such options as "Show readme", or "Start program". Issue The problem is, many of these installers are poorly coded, and do not drop permissions appropriately. For example, starting the application automatically, or opening the application's homepage in the browser, often results in launching the application or browser with the installer's Administrative privileges, or a "High" UAC integrity level! This has the potential to open up security breaches, by opening up the installed application, or a web page (and possibly browser add-ons), that are now running with elevated permissions. (This is the reason I strongly recommend never choosing auto-launch options when installing software.) Question The question is: Is there a way to prevent certain applications (such as a web browser) from ever being launched with Administrative privileges, i.e., an automatic drop-privilege?

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• Enterprise Data Center System Admin/Engineer to Server Ratio

  - by Bob

  I know there have been similar questions asked over the last few months however looking at a Data Center Operations and know there are some really smart people out there that might be able to help. Looking for some staffing best practices based on first hand experience and was hoping that there is some experience in this area that can provide "best practice" application: Three High Availability (99.99% plus) Enterprise Level Data Centers geographically dislocated, one manned 24x7x365, one lights out, one co-location running HOT-HOT-HOT supporting a global community. More than 2,000 operating systems consisting of 95% Windows, 5% Linux and Solaris, 45% virtualized, more than 100TB storage. No desktop support, no Network Administration (administrated separately), running N+1 and serving more than 250 Billion page views annually. Based on experience what has been your experience with Server to "Data Center System Administrator/Engineer" ratio? Thanks in advance for your responses.

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• Enable group policy for everything but the SBS?

  - by Jerry Dodge

  I have created a new group policy to disable IPv6 on all machines. There is only the one default OU, no special configuration. However, this policy shall not apply to the SBS its self (nor the other DC at another location on a different subnet) because those machines do depend on IPv6. All the rest do not. I did see a recommendation to create a new OU and put that machine under it, but many other comments say that is extremely messy and not recommended - makes it high maintenance when it comes to changing other group policies. How can I apply this single group policy to every machine except for the domain controllers? PS - Yes, I understand IPv6 will soon be the new standard, but until then, we have no intention to implement it, and it in fact is causing us many issues when enabled.

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• Small WiFi Network In a Noisy Environment

  - by Sam Skuce

  My company is demoing our network enabled products at big conferences. For this purpose, we would like to be able to set up a small WiFi network in our booth with a range of less than 10 meters. We will only be connecting the device that we are demoing and the iPad or PC running our demo software. I understand that there are conferences that won't allow you to run your own WiFi equipment, but some fairly big ones do (e.g. IMTS, which we were just at). I know that the AP should be encrypted and not broadcast its SSID, but are there additional equipment considerations to deal with the high level of RF noise in such an environment? Is there a particular technology that I should be looking at?

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• Is it possible to put an 8000 series socket-F Opteron into a dual-socket motherboard?

  - by René Kåbis

  Exactly what it says on the Tin. I have a dual-socket, socket-F motherboard in which I am looking to put two high-end quad-core Opterons, but the 2000 series are nearly double the price of the 8000 series on eBay. Can I just drop in a pair of 8000 series processors and be done with it, or are there processor-critical motherboard features that would be present on a quad(+)-socket motherboard that don’t exist on a dual-socket motherboard? Please elaborate or link to resources that can explain this further, as I am not adverse to research (and I am interested in the technical issues involved) I am probably using the wrong search terms, as Google failed to return anything within the first few dozen results.

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• How can one make the title bar text have better contrast on dark colors in Windows 8?

  - by zeel

  When Windows 8 color setting are set to a very dark color, such as black or navy blue, the title bar text and the minimize/maximize buttons are nearly invisible. This makes dark colors difficult to work with. In Windows 7 there was an advanced color options, this is gone in 8. The registry keys associated with this seem to still be present, but they have no effect. Is there a way to change this? Or a third party application that can do it? I don't want to use the ugly high contrast theme, I want to use the nice Win 8 theme with a dark color.

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• Any way to disable specific CPU idle (Cx) states?

  - by Philippe

  I just got a new Toshiba Tecra S11 notebook, which has a Core i5 520M CPU, and it appears to suffer from a well-known problem: a high pitched noise when the CPU is idle. Googling around revealed that this is caused by a specific power-saving mode in the CPU. In most cases, C4 mode is blamed for the noise. So my question is: is it possible to disable C4 mode (or any other "sleep" mode) using some utility or BIOS setting? I don't mind if it hurts battery life. I'd appreciate any advice on this matter. It's driving me crazy. FYI: I'm running Windows 7 64-bit

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• How can I monitor ports on Windows?

  - by Olav

  What is the simplest way on "local" (1*) Windows, for known ports, to: Find out if it is used. Find out as much as possible about what is behind the port. Find out as much as possible about traffic through the port. Find out if something else is interfering with the port and traffic to it. I have used Fiddler in the past, but I think that's mostly HTTP? I don't if Wire-shark does more? I think there is a tool closely integrated with Windows? Which one? (5). I am looking at NMap, but its seems to be more a suite of tools, and a high entry level. 1*: Primarily this is for what happens inside my Windows Machine, but if necessary, I can for example use a VM, or the wireless connection.

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• Does "I securely erased my drive" really work with Truecrypt partitions?

  - by TheLQ

  When you look at Truecrypt's Plausible Deniability page it says that one of the reasons for partition with solely random data is that you securely erased your drive. But what about the partition table with full disk encryption? How can you explain why the partition table says there's a partition of unknown type (With my limited knowledge of partition tables I think that they store all the partition filesystem types) and with solely random data? It seems that if your going to securely erase the drive you would destroy everything, including the partition table. And even if you just wiped the partition, the partition table would still say that the partition was originally NTFS, which it isn't anymore. Does the "I securely erased my drive" excuse still work here? (Note: I know that there's hidden truecrypt volumes, but I'm avoiding them due to the high risk of data loss)

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• We want to setup low cost private cloud [closed]

  - by Virtual Jasper

  We are a small company with very limit funds. In order to improve our server reliability, we are studying to migrate to CLOUD. We seen some CLOUD provider, they would charge by resources such as, CPU, RAM.....Disk space....High Availability....etc. We have server team, so we also consider to built the private CLOUD, we seen the Windows 8 server, it does need license fee. So we looking at Linux side, we look at Ubuntu and OpenStack. What is the different between Ubuntu and OpenStack solutions? Is it both free on software license? and only to pay the technical support.

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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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• Mac OS X: What is using my 'active' memory?

  - by badkitteh

  Hello fellas, I'm using a recent MacBook Pro with 8 GB of RAM and after a few hours of using it at work I notice the amount of 'active' memory growing and growing. Whenever I reboot my Mac, everything looks fine and it is hardly using any RAM. But after a few hours it looks like this: As you can see, in this case it's about 4.3 GB. Being a developer, I know that 'active memory' is the amount of memory that is currently used by running processes. So the first thing I did was quitting all applications and killing all processes that don't seem to belong to Mac OS X. After I did that, my active memory came down about 400 MB, but got stuck at what you see in the screenshot. There are no more processes or applications to quit. Now I'm wondering what is actually holding on to the memory? top and Activity Monitor don't report any processes with a high memory usage. Any ideas? Thanks!

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• Image annotation with Inkscape, Pointer and explanation for objects in picture

  - by None

  I need straight paths with end markers for associating text to parts of the image. For better readability, it needs to be high-contrast, i.e. a white line with black outline. Stroke to path will create a group of a box and a circle from the line with end marker. This makes placement of the markers more difficult, as with the node tool it is just a matter of dragging the end nodes of a line segment. I will try to place the markers as line for now and only finally converting them to an outline.

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