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• Distributed filesystem across a slow link

  - by Jeff Ferland

  I have an image in my head where a link is too slow to realize the real-time transfer of files, but fast enough to catch up every day. What I'd like to see is a master <- master setup where when I write a file to Server A, the metadata will transfer to Server B immediately and the file will transfer at idle or immediately when Server B's client tries to read the file before Server A has sent it. It seems that there are many filesystems which can perform well over fast links, but I don't know of any that do well with a big bottle neck and a few hours of latency.

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• Cloning Fresh Windows 7 with external HDD, DVD or CDs?

  - by hhh

  I want to create Windows installation disk (not necessarily CD) from my Windows 7 Pro laptop, not sure what it actually means here. The material is about 50-60GB, requiring about 12 pcs of 5GB disk (not going to happen, too much work to use them later). I have the Windows serial on the laptop bottom and this is so-called firm -laptop (no idea what it actually mean, better warranty and some instant support thing apparently). Now how to do the clone with external material such as DVDs? how can I create mock-windows-installation medium or some real windows-installation medium? I am now not sure whether Windows offers W7 -installations medium online, well my W -peer mentioned some MSDAA -something. Perhaps related Cloning Fresh Windows 7 -fsed HDD to Linux Server because having no external HDD or disks for the Backup

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• is using Hosts for resolving a sql-server more performant?

  - by Ice

  Hi, we have a legacy application which uses a access.mdb with hundreds of ODBC-connected tables on a sql-server. the access.mdb contains nothing else than these odbc-connections. Now we consider to use a virtual sql-servername for these odbc connections and resolve it in the local hosts-file with the ip-address of the real sql-server. Like this we can easy switch between a test-sql-database server and the the server for production in changing one single entry in the hosts. EVERYTHING works fine and now comes the question: Could it be that this is more performant because there is one single point on resolving the sql-server (name or ip-address)? Is there something like a network-cache / DNS-Cache? peace Ice

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• 502 errors with apache mod_proxy hot standby (or equivalent)

  - by 6million

  Anyone knows how to configure the hot standby (+H) mod_proxy feature so that the takeover occurs immediately (without even one user receiving a 502) error during a shutdown? We aren't looking for real load-balancing, we just want a secondary server to take over while we shutdown the primary. The problem is that whenever the primary goes down, I'm able to slip one invalid request resulting in a 502 HTTP error reaching the end user,before the secondary actually takes over. Listen 80 <VirtualHost 127.0.0.1:80> ServerName domain.com ProxyPass / balancer://balance/ <Proxy balancer://balance/> BalancerMember http://primary_ip:80 BalancerMember http://secondary_ip:80 status=+H </Proxy> </VirtualHost>

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• MySql transfer / update (a bit specific)

  - by Jeff

  before posting I was digging whole site but didn't find help for my problem, so I hope someone will help... Facts: 30 Gb mysql database on remote server (about 20.000.000 rows) data are once weekly updated in local network (mysql) I need to transfer/replace local updated database with remote connection is about 2mb (real mb, not mbps) up/down Point is that I can't have 'down time' of remote mysql server. Until now I Tried: navicat data sync - Ok, but take about 3 days to finish dbForge - ok but need 5 days to finish mysql dump transfer to remote server and execution - about day, but a lot of downtime rsync folder with database /mysql/lib/MY_DATABASE - 4 hours, but after that I need to execute always 'repir on remote server' which takes about 2 hours, and a lot of down time mysql dump piped from cl to directly goto server - still now satisfied many problems I could give you more things that I tried... mysql replication - slow Anyase, what is best,best way to: refresh remote mysql on weekly level and in same time to have 0 sec down time nor huge server load If you have any idea please share

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• Setting up proxy to handle subdomain requests

  - by PeeHaa

  I have setup a proxy for a site which works with the following nginx config: server { listen 80; server_name proxy.example.com; access_log /dev/null; error_log /dev/null; location / { proxy_pass http://thepiratebay.se; proxy_set_header X-Real-IP $remote_addr; } } However on this there are also styles loaded from a subdomain (static.thepiratebay.se) which aren't going through my proxy, because it links to the original domain. Is there a way to also let those requests go to my proxy? Do I have to change the contents of the pages when serving it to let them also go through my proxy? If so: how? :) Or is there another (perhaps better) way?

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• Graphing per-user CPU usage on a Linux machine

  - by mart1n

  I want to graph (graphical output would be great, i.e. a .png file) the following situation: I have users A, B, and C. I limit their resources so that when all users run a CPU intensive task at the same time, those processes will use 25%, 25%, and 50% of CPU. I know I can get the real-time stats using top but have no idea what to do with them. I've searched through the huge top man page but haven't found much on the subject of outputting data that can be graphed. Ideally, the graph would show a span of maybe 30 seconds. Any ideas how to achieve this?

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• Windows 8: Multiple monitors with varying DPI? [closed]

  - by Sid

  Possible Duplicate: Dual monitors on Windows - How do I set a different DPI or text size on each monitor? I'm running Windows 8 on my Macbook Pro Retina (220dpi) which has an external 24" monitor (~96 dpi). In Mac OS 10.8.2, the display settings seem ok and I can actually use both displays without usability issues. I don't know what scaling settings etc it uses but it looks fine. On Windows 8, however when I boost the DPI settings to take advantage of the retina display, it blows up the display on the external monitor - text is giant sized. How can I tell Windows 8 to use the real DPI settings of each monitor? NOTE: I'm not asking for Windows 7.

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• What does this error mean (Can't create TCP/IP socket (24))?

  - by user105196

  I have web server with OS RHEL 6.2 and Mysql 5.5.23 on another server and the web server can read from Mysql server without problem, but some time I got this error: [Sun Sep 23 06:13:07 2012] [error] [client XXXXX] DBI connect('XXXX:192.168.1.2:3306','XXX',...) failed: Can't create TCP/IP socket (24) at /var/www/html/file.pm line 199. my question : What does this error mean (Can't create TCP/IP socket (24))? is it OS error or Mysql error ? perl -v This is perl, v5.10.1 (*) built for x86_64-linux-thread-multi mysql -V mysql Ver 14.14 Distrib 5.5.23, for Linux (x86_64) using readline 5.1 su - mysql -s /bin/bash -c 'ulimit -a' core file size (blocks, -c) 0 data seg size (kbytes, -d) unlimited scheduling priority (-e) 0 file size (blocks, -f) unlimited pending signals (-i) 127220 max locked memory (kbytes, -l) 64 max memory size (kbytes, -m) unlimited open files (-n) 1024 pipe size (512 bytes, -p) 8 POSIX message queues (bytes, -q) 819200 real-time priority (-r) 0 stack size (kbytes, -s) 10240 cpu time (seconds, -t) unlimited max user processes (-u) 1024 virtual memory (kbytes, -v) unlimited file locks (-x) unlimited

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• DAW with realtime pitchshifting

  - by monov

  I'm very happy with Renoise but it has a problem, it can't do realtime pitchshifting. For example, consider a breakbreat which I want to trigger at different pitches sometimes. Like I keep 'Q' pressed for a 'C' pitch, but then I press 'B' for a lower pitch. In Renoise the resulting beat is not only lower pitch, but also longer/slower. I want it to be the same speed, just a different pitch. I've been doing this externally in Audacity, then keeping a couple of different pitched versions in Renoise but that's tedious. Or consider a melodic segment snipped from a song into a sample. Say I want to play it simultaneously in its real pitch and 5 semitones higher, so it forms a sort of chord effect. Again, no easy way to do this in renoise. Is there a DAW app that does that kind of thing? I've heard of ableton live, it has 'live' in the name so maybe it can do it?

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• Custom host file for Firefox

  - by acidzombie24

  Instead of changing my host file I'd like Firefox to think my domain is on my own server while my other browser uses the real IP address. I used to edit my host files but that forces both browsers to change the IP address. I found change host, but it doesn't appear to use the alternative host file. I also saw a comment asking when it will work on Firefox 6+. I tried Host Admin and it fails. It works but the alternative IP address must be in your host file already (which I don't want) and it lets you deselect a domain so the host file is ignored which is not what I want.

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• Script/scheduled task to clean up Dowloads folder (Windows 7)?

  - by Andrew

  My downloads folder is my primary connection to the internet (and thus the world), and has rapidly become a virtual junk drawer. I imagine I'm not alone here. What I'd like to do is have some sort of a script that -creates a new folder (named YYYY_MM Archive so it sorts nicely) -takes everything* inside of the Downloads folder (for the current user) -moves it to the new folder and have this run once/month. *(excluding previous archives) This strikes me as the type of thing Saw some answers on related questions that seemed to suggest that this is an eminently doable task in PowerShell. Is it? I'm on Windows 7 Enterprise.

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• How to select the page range to print in Windows 8 Modern UI apps?

  - by Magnetic_dud

  Today I wanted to print an email from the Mail app (modern UI). I selected devices from the charms bar, and I chose my printer. The problem is that it was a very long email (a 40 replies unthreaded email), and I only needed the first page. It looks like there is no way to select a page range in the simple printing dialog, am I right? I solved the problem by inserting just one page in the printer and then deleting the job, but this is not a real fix... (I could print to a PDF printer, then open in Acrobat and print again, but...)

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• Password protect app in jetty

  - by JohnW

  I am testing a webapp (.war) running in Jetty 7. For demo purposes I want to run this on a public URL, however I would like not to have the whole world (if they happen to come across the URL) be able to see it. Is there a way to make Jetty require a basic-auth type of authentication when accessing the webapp (without modifying anything inside the war, i.e. no edits on the web.xml file)? Or if not the webapp, then any part of what Jetty provides at port 8080?

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• Apache on Windows in production environment? Why not?

  - by tillda

  "Everyone" know that Apache is for Linux/Unix and on Windows IIS is the way to go. However, I'm not a pro at Linux and it would be an enormous relief for me to use just the same setup in the production environment that I use during development. I'm a solo developer and I'm trying to make things as simple as possible. I've already got rid of other issues like storage (-cloud) emails (-postmark). So, what are the real drawbacks that can happen when I just put Apache in Windows virtual private server from Rackspace and use it as the main production environment for a PHP project? Money for more VPS resources is not that big issue compared to the possibility of not having to learn a different OS. Super-heavy traffic is not expected. Also my PHP project can be quite optimized. There are some heavy scripts, but only for the inside (logged) users. All else can be served more or less statically.

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• Dell monitors keep blank after initial start

  - by offler

  We have Dell T1650 PCs with 2 nVidia graphic adapters / Windows 7 and 4 attached monitors. At initial start all screens are blank, the computer does not show anything. If powered off by pressing the hardware power button and then restarting all monitors show a picture. The Windows event log shows only the errors, that the machine was shut down unexpectedly. The last entry with blank screen seems to be that user specific dlls for every application are loaded. How can I find out the real problem?

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• Install Firefox on Windows 7 for all users

  - by Pointy

  This has got to be among the simplest possible things in the word for those who know how to do it. However, I don't, and I have been astonished to find nothing about it from google searches other than unanswered copies of the exact same question. All I want is Firefox, and I want it for all users on a Windows 7 laptop. In fact, the real story is that I want it to work again for all users after updating from Firefox 5 to Firefox 8, which process has apparently left it unavailable to anybody but the administrator. I'll probably find the answer to this in the time it takes for this question to get answered, but I promise I'll upvote you anyway :-) I mainly wanted to get this question (hopefully with good answers) out there so that it turns up on a Google search.

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• VPC on Windows 7 very slow network

  - by Shigg

  I have a Windows 2003 virtual machine which I use for website testing. I've just installed Windows 7 and am using the new version VPC (not xp mode). When I try to copy a file - I need to copy some big databases across - I get a file copy speed of about 20k per sec. Copying from one PC to another on the real network transfers files at 13mb per second. Any ideas what may be causing this? I've turned off differential network compression on win 7. The Virtual HD is on a seperate physical drive to the OS. Running Windows 7 64 bit on a dual xeon with 16gb ram and 10,000 rpm drives. Tried installing VPC 2007 but windows blocks it running saying its not compatable. Many thanks for any ideas.

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• Will learning to use Fedora also teach me my way around Redhat (CentOS)?

  - by Matt Untsaiyi

  I want to dive into the open source world and start using a Linux distro while learning to program. I've looked over the options and it pretty much boils down to Fedora or CentOS. The reasoning behind it is I'm hoping to kill two birds with one stone... Redhat seems to be "the choice" for servers, so I figure as I learn to program, I can also learn my way around Linux... or Redhat more specifically... and get that under my belt too. I want to use Fedora, and be on the frontier of new software (since I'm not doing anything critical), but if it's completely different than Redhat I'd rather just use CentOS. So is it? Or can I use one and know the other?

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• Does a modern PC require a graphics card to run?

  - by ArtM

  As I can remember, on old systems (Pentium II or III) it was not possible to boot and run the PC if the graphics card was missing (AGP cards were used in those days). Many years from then, I'm using motherboards with integrated graphics and I have no experience related to this subject, the "graphics card" always was present. Currently I intend to build a home/private "server" for my purposes and most of the motherboards I want to buy have no integrated graphics (AMD 870 or 970). I can take a normal graphics card from my firends for a few hours/days and use it when installing the necessary software. The question is: can I boot and run the PC without problems after I install everything I need and the graphics card is removed? if a general answer cannot be given, at least some examples of manufacturers/MB series/MB models will be helpfull I think it's obvious, but for completeness: I mean cheap desktop components, not real servers.

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• Turning a running Linux system into a KVM instance on another machine

  - by Charles

  I have two physical machines that I wish to virtualize. I can not (physically) plug the hard drives from either machine into the new machine that will act as their VM host, so I think that copying the entire structure of the system over using dd is out of the question. How can I best go about migrating these machines from their hardware to the KVM environment? I've set up empty, unformatted LVM logical volumes to host their filesystems, with the understanding that giving the VMs a real partition to work with achieves higher performance than sticking an image on the filesystem. Would I be better off creating new OS installs and rsyncing the differences over? FWIW, the two machines to be VM'd are running CentOS 5, and the host machine is running Ubuntu Server 10.04 for no particularly important reason. I doubt this matters too much, as it's still going to be KVM and libvert that matter.

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• Boot.ini on Windows Server 2003 R2

  - by Jason H.

  I have a Windows Server 2003 R2 with 48 GB of RAM; server has been running strong for quite some time. Recently our boot.ini was modified causing issues, most likely by our remote administrators. Now the server is only showing 14 GB of RAM. This has caused major performance issues for our end users. Our remote administrators have stated "we don't change the boot.ini settings(switches)". However, I know for a fact that all of the local administrators have not modified the switches (due to lack of permissions). The real question.. Is it possible to "audit" who has modified the boot.ini? If thats not possible, can the boot.ini be set via startup? Any help would be greatly appreciated. This is an ongoing issue that I would love to resolve.

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• Cant checkout from WebSVN

  - by yoasqie

  I am trying to download a script from SVN. The url looks like this: http://websvn.myurl.com/list.php?repname=name_1 I am trying to download using: svn checkout --username myuser --password mypass "http://websvn.myurl.com/list.php?repname=name_1" I got "URL is not properly URI-encoded", then I changed the "?" for "%3F", and the output shows: svn: OPTIONS of 'http://websvn.myurl.com/list.php%3Frepname=name_1': 200 OK (http://websvn.myurl.com/) But nothing gets downloaded. Sorry I can't post the real URL, but it's a private project and I don't have anyone else online to ask. What am I doing wrong?

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• node.js server not running

  - by CMDadabo

  I am trying to learn node.js, but I'm having trouble getting the simple server to run on localhost:8888. Here is the code for server.js: var http = require("http"); http.createServer(function(request, response) { response.writeHead(200, {"Content-Type": "text/plain"}); response.write("Hello World"); response.end(); }).listen(8888); server.js runs without errors, and trying netstat -an | grep 8888 from terminal returns tcp4 0 0 *.8888 *.* LISTEN However, when I go to localhost:8888 in a browser, it says that it cannot be found. I've looked at all the related questions, and nothing has worked so far. I've tried different ports, etc. I know that my router blocks incoming traffic on port 8888, but shouldn't that not matter if I'm trying to access it locally? I've run tomcat servers on this port before, for example. Thanks so much for your help! node.js version: v0.6.15 OS: Mac OS 10.6.8

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• High Availability Clustering and Virtualization

  - by tmcallaghan

  I'm trying to understand how the various virtualization vendors (specifically Amazon EC2, but also VMware and Xen) enable software vendors to provide a real HA solution in the environment where the servers are virtualized. Specifically, if I'm running any HA application (exchange, databases, etc) I need to ensure that my redundant virtual "servers" aren't located on the same physical server. Using in-house virtualization solutions (VMware, Xen, etc) I can provision accordingly as well as check the virtual - physical arrangement. I could, however, accidentally "vmotion" to the same physical hardware. With EC2, I don't even have the ability at provision time to select different physical servers. Since their Cluster Compute Instances are 1 virtual server per physical server it seems to be the only way to guarantee I don't have a false sense of redundancy. Any ideas or thoughts would be helpful. What are others doing about this problem? If the vendors provided an API where I could get something as simple as a unique physical system identifier I could at least know if I'm going to have an issue. -Tim

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