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• Mirrored servers in data centers nationwide -- how?

  - by Sysadmin Evstar

  I flubbed my IT interview with Google by getting this question wrong. I thought that in the various metropolitan areas, an "http://google.com" request went to a local DNS server in a geographically nearby datacenter, which then returned an IP address for just one of several nearby http servers, which then rollover'd to the next local server, and I could not explain how or where the nationwide DNS kept its table of the available local servers cached, or how such a rollover happened. Or how they could manually take some server out of rotation, from anywhere. Fail. So, which Wikipedia page should I be looking at now so I can ace this question next time? And, what daemons run on these machines 24/7 to keep the mirrored database disks synchronized?

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• Inconsistent slow DB connect times

  - by mcryan

  I have an app that shows significantly increased load times every 5 minutes. We use New Relic and I've been able to identify that every slow request is due to our DB connect functions. I've looked through our frontend servers and db servers and have ensured that there are no cronjobs running every 5 minutes - though the increase comes every 5 minutes without fail. I feel like I've tried everything I can to isolate this but I'm not having any luck. It is not coming from a cronjob, there is no cache expiring every 5 minutes, etc. What else could I check, and does anyone know of anything that could cause this sort of behavior? For what it's worth - our stack includes Apache, PHP, MySQL, Varnish and Memcache. SQL and memcache are running on dedicated servers and we have a number of frontend servers behind a load balancer, each running Apache and Varnish. Spike every 5 minutes: And it's always db connect (in red) taking up all of the time:

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• IPv6 feature in Network Adaptor is Slowing Internet

  - by Teknophilia

  The past few days, my internet browsing has become very poor. It's not a matter of speed, as a speed test will give at least 15Mbps. It seems as if my laptop has a hard time actually connecting to the sites. I've found a possible culprit, but don't know why it would affect anything: Going to adapter settings and disabling ipv6, but leaving ipv4, my browsing is back to normal. Re-enabling ipv6 brings back the issue. This is strange though, because I have always had ipv6 enabled. Moreover, using sites to test ipv6 compatibility, I fail with ipv6 enabled on my adapter, and pass when it's disabled. Ideas about why this is happening, and how to fix it?

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• Configuring a backup DNS server

  - by mattyh88

  I would like to setup a backup DNS server. I have added all my name servers in my domain name panel. (ns1.domain.com, ns2.domain.com, etc ...) If a person would try to go to domain.com and the first name server would fail, will it automatically try and use ns2.domain.com? All my DNS servers have the same master zones configured. Is that the way to go? Is it that easy or am I missing something here? :)

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• Transparent, unicode X terminal not tied to a Desktop Environment?

  - by jamuraa

  I've been looking for this for a while now and I just haven't been able to find one. The last few that I used were: aterm - this one was fast and had good transparency support, but it doesn't support Unicode at all as far as I can tell. The dependency graph is also reasonable. gnome-terminal - was good, and had good transparency support plus unicode, but it pulls in about everything in gnome, and I don't use anything else in gnome. It was also somewhat slow (noticable lag in updating at times) and wouldn't use fonts that I wanted. Eterm - same thing as aterm, good dependencies and transparency but no unicode. Does anyone have suggestions, or will I be stuck with gnome-terminal's dependencies and slowness?

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• Timing startup processes?

  - by acidzombie24

  My Windows 7 use to boot up fast and now its getting rather slow. I suspect one program is eating up all the time yet i cant tell what it is since task manager shows <40% of the cpu being used. What can i use to track how long each process takes when my computer boots/starts up? Note: Except for launchy which i used before my comp became slow, all my startup and services are all signed and known (broadcom, VMWare, Google Inc, Intel, etc) Note2: I am mostly considering the time it takes after i login but i suspect the time before that is slightly slower (i dont think very much though)

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• very Slow machine when searching the network

  - by Adam

  Hi We are using a Dell desktop machine with 2 GB RRAM & Pentium D 3.00 GHz. The machine is very slow when using our Sales program and searching over the local network. We have this problem on 2 machine which are the same spec - This one and another. All of our other machine (10) run fast with no issues. Our server is SBS 2008 and AV is AVG. All of our client machines are WinXp Pro SP3 using the latest drivers. Any ideas?

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• How painful is a django project upload to a live (staging) site?

  - by Ignacio

  Hi, I've getting quite fast with a small django project of mine, which I'm developing locally, of course. But, as I had never worked with django before, I'm not aware of what it implies to upload it and test it on a production server. And I'm quite curious, since I'm very eager to test an early release live. I know there is this document, which I think it'll be really helpful: http://djangobook.com/en/2.0/chapter12/ But, are there any details I should take into account before, during and after the deployment? Any advice or best practices? Thanks.

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• CSS file not served by IIS 7.5 after multiple clear cache refreshes in a row in browser

  - by KenB

  We are experiencing an interesting issue with IIS 7.5 static caching and a css file. When we use IE to hit the page in question everything works fine - 200 OK on css file. When we refresh the page it works fine - 304 Not Modified on css file. When I refresh again with control key it reloads fine - 200 OK on css file. Now if I do a control key + refresh multiple times in a row really fast the css fails to load and in the developer tools network it says "Loading..." for the css file and it hangs never coming back. Any ideas?

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• What can cause a black or blank screen when pressing logout or switch user in windows 7

  - by Medran

  The situation I have here is related to a brand new dell machine with a GTX260 video card. Put simply after one user logs in when that user either 'switch users' or 'logs out' windows goes to a black/blank screen. The TV screen that is used with this computer previously functioned fine with fast user switching on an XP machine. The new computer is windows 7. The TV is not outputting any error messages like 'no signal' or anything else that would be displayed if the computer was off. You can fix the problem by cycling the input on television, after cycling the input the welcome screen appears as normal. What I want to know is what on earth is windows doing that would cause the video card to stop sending the same signal to the monitor when the user logs off or switches users. I mean as far as I can tell the resolution is identical between windows and the welcome screen. Or perhaps if somebody has experienced this before a fix would be great too.

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• Run script when Varnish starts

  - by kipusoep

  I'd like to run a script when Varnish starts. This script should execute a webrequest to a webserver (its backend), which then makes sure Varnish's cache gets filled with all pages residing on this webserver. So this script makes sure everyting is in Varnish's cache when Varnish (re)starts, because we're using Varnish as cache and fail-over (the webserver should be able to be down for let's say a week for example, without any consequences). What are the possibilities to do this? We can't just edit /etc/init.d/varnish and /usr/sbin/varnishd because they can het overwritten when updating varnish? Thanks!

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• What causes extra space and random alignment in my divs using the 960 grid system?

  - by tomdot

  I have an issue where elements in divs seemingly align randomly, not responding to any align tag, and where divs create extra space above or below its element. I'm using the 960 grid system and I have not altered the stock CSS file lest my fingers blow it up. I've put up a test page here, and please excuse some of the dodgy code :-D It's still in it's very early stages (as am I), but I don't feel I can move on until I can comfortably understand what is causing the issue. The best example on that page is the bottom horizontal bar and elements underneath. The bar adds a few pixels of dead space, and the elements below that align to different parts of their respective divs. Why is it that elements seemingly do not standardise their alignment given no instruction, and what causes extra space again where no instruction was given? My own thought was to relatively position everything individually, but I'm worried this will cause issues and 'break' the grid. Other than that, I unno. Thanks

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• So confused by these CPU Specs can someone please help me out? THanks!

  - by Kevin

  Intel® Core™ i7-640M (2.8~3.46GHz, 35W) w/4MB Cache - 2 Cores, 4 Threads - 2.5 GT/s SO i'm buying a new laptop, which i have not done in 6 years. So i am not familiar with any of these cpu specs. It was the highest option for intel for this laptop. So i am assuming it is somewhat fast. But i'd like to learn what these specs mean. Any help would be greatly appreciated. i am not really a computer guy but would love to learn about what I am buying. Thanks!

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• How do i keep a newly started program from taking focus?

  - by Jugglingnutcase

  Say i'm coding in emacs and want to start up a music program. Because it takes too long to start up i go back to coding and type away. When the music application starts up, the focus is stolen (gasp! stolen!) away from emacs and goes to the music application, often mid-thought. Is there any way to keep this from happening and have the newly started application not have focus until i see that it's up and ready to be used? Besides getting rid of my ADD of course. Or getting an impossibly fast computer that can keep up with my mind. i'm using a Windows XP system, but i will soon have a Windows 7 system, and i have Linux at home.

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• How to backup old emails locally in Thunderbird and then remove them from IMAP server?

  - by saicode

  I am using Godaddy IMAP email with Thunderbird as my desktop client on Windows 7. The email service has unlimited mailbox size but the local Thunderbird is having troubles due to the large size of the inbox/outbox. I would like to take out old emails from IMAP server and backup them locally. After backing up the old email I would like to delete old email (older than let's say, 2012) from the server. Also I'd like to have them accessible from the local backup if ever needed in the future. This way I might be able to make Thunderbird fast and problem free. Problem is, I am not able to find any instruction to do this in an automated way based on dates etc. I can find some links for Archiving, Compacting and Backup. But unable to find any tutorial about how to backup and archive it locally and delete the original emails from the server.

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• How do I upload large (30MB) files via a web interface?

  - by Dan

  Because I'm stumped... The client needs to be able to upload large images to a library but the upload fails after 5-6MB (over my poor connection). It seems to be timing out as the filesize at fail isn't consistent. The setup is a form which is accepted by PHP. I've googled and played with php.ini and everything is set for big uploads and long timeouts. Platform is a dedicated windows server at GoDaddy. What's going wrong?

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• RAID striping on a desktop machine

  - by Blazemore

  I currently have a 120Gib SSD which is pretty fast for things like game loading times and video editing. However, I was wondering about getting another identical drive and hooking it up with a striping RAID array in hardware (I boot multiple operating systems). This would have the dual benefits of providing a larger logical drive, while also providing greater performance. However, I have a few questions: What kind of performance increase can I expect to see with a pair of good quality SSDs? How expensive is a quality desktop RAID controller? Will the controller present the OS with a single logical drive? Does this mean I can still partition it and multi-boot? Basically, can I treat the RAID controller as "a hard drive" at the OS level?

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• How can I monitor network usage by process on Mac OS X?

  - by psmith

  Is there any way to find out which process using how much internet bandwidth on Mac OS X Lion? I'm on mobile internet now, which is not very fast, so it would be nice if I can tell that for example, Chrome using 10kB/s, and Skype using 2kB/s. I can see the total amount of traffic in Activity Monitor, but it is not enough for me. I'd like to use an existing application, not interested to write an app like this. And I'm not interested in the actual traffic, only the number of bytes transferred and received by each processes.

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• How Can I Speed Up Terminal.app or iTerm on Mac OSX?

  - by pmaiorana

  Every time I launch either iTerm or Terminal after not using it for a few hours, it takes anywhere from 10-20 seconds to return a prompt. The screen is blank, and although I can type I can't actually run any commands. If I quit either application, subsequent launches (if done relatively soon thereafter) are quite fast. The slowness only seems to occur if the app wasn't running for a few hours. I'm running OSX 10.5.7 on a MacBookPro. I have the exact same setup on another computer, with no slow downs. Any ideas how to speed things up again?

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• can /usr/src be a sym link?

  - by lord.didger

  I want to store all source code of programs I have installed in /usr/src. However, due to size of the drive I made a sym link /usr/src that points to ~/src. That was nice. Unfortunately, that caused virtualbox-dkms to fail to build the virtualbox kernel module because of a symlink within the linux-headers-*-common. 'script' points to ./../lib/linux-kbuild-3.1/scripts what is fine in /usr/src directory but wrong in ~/src. Can I bypass this problem or the only solution is to store sources within the directory /usr/src?

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• Moving a File While It's In Use -- How Does it work?

  - by Zaz

  I've noticed that on non-windows OS.... ie linux/mac i can do things like: - Send a zip to a friend over aim - Delete the file while it's in transfer And the transfer does not fail. Or, I can do operations like.. - start a movie - erase the file - the movie still plays to completion (read from disk, not just buffered in memory) Although the files are being "deleted", as i mentioned, they are actually being moved to a different location on the file system... ie a Trash directory or something. So it seems to me like the OS uses a pointer @ the file that is updated when it moves rather than accessing the files directly. Can anyone shed some light on how this AWESOME capability is actually implemented? I'm not even sure what to google to learn more about it. thank you.

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• GLOB_BRACE portability?

  - by Pekka

  In this question, I was made aware of glob()'s GLOB_BRACE option that allows for a limited set of regular expressions when searching for files. This looks just like what I need, but according to the manual, GLOB_BRACE is "not available on some Non-GNU Operating systems." Among those seems to be Solaris. I am building an application that is supposed to be as portable as possible, so I need to check out possible problems as early as possible. Does somebody know of other platforms apart from Solaris where GLOB_BRACE is not supported? How about Mac OS = X for example? It's built on top of a Unix. Is every Unix automatically a "GNU" platform as defined in the manual?

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• My laptop keeps hard resetting

  - by cgoddard

  I have had this laptop for a long time (five years at least) and it hasn't had the best treatment over the years. But over the last few months, it has been randomly completely shutting down, no blue screening, no steady shutdown, just black screen, then BIOS. I think it might be happening as I do a save, but cant be sure, but recently it has been getting very annoying. I did initially think it was an overheating issue, but the speed that it comes back online is staggeringly fast for it to have cooled down sufficiently. plus it has got incredibly hot before with no issue (since its been doing this). Does anyone know what might be going on? Dell Inspiron 640m, running Windows 7.

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• Response.Redirect exception

  - by Tedd Hansen

  Executing the line: Response.Redirect("Whateva.aspx", true); Results in: A first chance exception of type 'System.Threading.ThreadAbortException' occurred in mscorlib.dll An exception of type 'System.Threading.ThreadAbortException' occurred in mscorlib.dll but was not handled in user code The exception is because of the "true" part, telling it to end the current request immediately. Is this how it should be? If we consider: Exceptions are generally considered heavy, and many times the reason for ending the request early is to avoid processing the rest of the page. Exceptions show up in performance monitoring, so monitoring the solution will show a false number of exceptions. Is there an alternative way to achieve the same?

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• Windows Service stops on Server Patch

  - by Carel

  I'm a developer that has a Windows Service that runs on a production server that sends emails that are entered into a database on a database server. Although the service is set to start automatically, whenever the web server gets patched (which happens every other week), for some reason the service fails to start and various emails don't get sent. I don't actually have access to the server, so I have to request a build administrator to start the service. What I want to know is whether there is any reason for the service to fail to start when the server is patched?

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