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• How long does it take in practice to warm up large in-memory databases?

  - by Sim

  Companies such as Peak Hosting are offering 64 core machines with 512Gb RAM for $2K/month. This is a very interesting choice for in-memory databases such as Memcached/Redis as well as databases whose performance degrades rapidly when the data & indexes don't fit in RAM, such as MongoDB. My main concern with monster machines such as these is the time it takes to warm up an in-memory database. In my experience, theoretical metrics, e.g., that SATA can load 100Mb/sec, fall short of what happens in practice. Even at that rate, 100Mb/sec means that loading up 512Gb RAM machine from SATA disks can take over 1 1/2 hours (!). I am looking for real-world reports of warm-up times for machines with very large memory. Please, share details of the software on the machine, data size, storage configuration, e.g., SATA or SSD, network, hosting/cloud provider, if relevant, etc.

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• Monitoring/logging a malfunctioning internet connection

  - by Pekka

  I have a mysterious internet connection problem: Every 15-20 minutes, the connection will become very slow, and take 2-3 minutes for anything to load. I've had a technician from the ISP over here to test the hardware, and everything is in pristine condition. They have no other explanation than a configuration error on my machine, a possibility I can exclude 90% because I'm experiencing the same problems with another machine. I will have to monitor the situation now, and I would like to run a program that logs when internet connections become slow. I thought about putting something together using at and wget. Does anybody know of some other tool for this that does this out of the box - maybe something with an adjustable request frequency, logging connection speeds etc.?

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• Is it safe to sync a Firefox instance in both directions?

  - by java.is.for.desktop

  Hello, everyone! I want to use some tool (not decided yet, which one) to sync a Firefox instance (more exact: user directory) between two machines. (EDIT: I want really to sync everything in the user-directory) Would you assume, that this is safe? What would happen, if some files are newer on the one machine, and some other files are newer on the other machine? Could this lead to inconsistencies, when, let's say, there are some inter-file references? If general, I don't have good experience with syncing application in both directions. Most applications seem not to be suited for this.

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• Is this too much to ask for a game programming and developing enthusiast? Am I doing this wrong?

  - by I_Question_Things_Deeply

  I have been a computer-fanatic for almost a decade now. I've always loved and wondered how computers work, even from the purest, lowest hardware level to the very smallest pixel on the screen, and all the software around that. That seems to be my problem though ... as I try to write code (I'm pretty fluent at C++) I always sit there enormous amounts of time in front of a text-editor wondering how every line, statement, datum, function, etc. will correspond to every Assembly and machine instruction performed to do absolutely everything necessary for the kernel to allocate memory to run my compiled program, and all of the other hardware being used as well. For example ... I would write cout << "Before memory changed" << endl; and run the debugger to get the Assembly for this, and then try and reverse disassemble the Assembly to machine code based on my ISA, and then research every .dll, library file, linked library, linking process, linker source code of the program, the make file, the kernel I'm using's steps of processing this compilation, the hardware's part aside from the processor (e.g. video card, sound card, chipset, cache latency, byte-sized registers, calling convention use, DDR3 RAM and disk drive, filesystem functioning and so many other things). Am I going about programming wrong? I mean I feel I should know everything that goes on underneath English syntax on a computer program. But the problem is that the more I research every little thing the less I actually accomplish at all. I can never finish anything because of this mentality, yet I feel compelled to know everything... what should I do?

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• Problems with Finder background images produced in Mac OS X 10.6?

  - by Joe

  Morning all. I'm creating DMG installers with background pictures. My build machine is 10.6. I'm having problems getting them working consistently: If I create one on 10.4 it works fine in 10.5, 10.5 and 10.6, If I create one for 10.5 it works fine in 10.4, 10.5 and 10.6, But if I create one in 10.6, the background picture shows in 10.6 but does not show in 10.4 or 10.5. I think I recall having seen similar reports in one or two places but there's not much information on the web. Has anyone here come across this problem? Is it recognised? Fixable? Unfortunately I have no option of running 10.5 on my build machine... Thanks! Update: This is a confirmed known bug in 10.6 . I will update this if there is any extra news.

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• how to monitor traffic at port 53 (DNS)

  - by Registered User

  I am a bit confused with the abundant tcpdump tutorials on internet. I am having a few of the virtual machines running on a virtualization server.Where I am debugging a problem.Port 53 is the one in problem. I have a bridged setup where out of 4 LAN cards on the machine in question one is active and it is xen-br0 I want to check if there is any request coming on port 53 on the server by other machines on LAN in question. I also want to see if the guest operating systems on LAN or any other machine is sending traffic at port 53.Due to abundant messages being generated via tcpdump I am finding it difficult to grep the output at desired port. So how can I use it if some one can give an example that would be helpful. Thanks in advance.

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• Can I use Cygwin as a replacement for Ubuntu, for bash script testing?

  - by Jeroen De Meerleer

  Next wednesday i'm having an exam on Operating Systems. In this exam there will also be a part bash-scripting. The teacher itself will test the scripts in a Virtual Machine running Ubuntu. Myself, however, I'm having serious troubles with running the latest Ubuntu (14.04 LTS) on a Virtual Machine (there are troubles with gnome running very slow). So I'm thinking about using Cygwin, which is doing the job great for another course. The teacher already confirmed I can use that, but I'm thinking he doesn't know it at all. I've already tested the scripts we made in class and they're all running without errors. But I'm quite sure there are some things I have to mind on. My question: would you use Cygwin as a replacement for the Ubuntu VM? Or should I stick it with the VM (maybe by using a different config/platform).

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• How do I configure upstart to run a script on shutdown when the process takes longer than 10secs?

  - by Tiris

  I am running ubuntu 11.10 in a virtual machine (VirtualBox) to learn more about development in linux. I am using a git repository to save my work and have written a script to bundle my work up and save it to the shared folder for use while the virtual machine is not running. I would like to automatically run this script before shutdown so that my work is always available if the vm is off (currently I have to manually run the script). I don't know if upstart is the best way to accomplish this, but this is the config that I wrote as a test: description "test script to run at shutdown" start on runlevel [056] task script touch /media/sf_LinuxEducation/start sleep 15 touch /media/sf_LinuxEducation/start-long end script pre-start script touch /media/sf_LinuxEducation/pre-start sleep 15 touch /media/sf_LinuxEducation/pre-start-long end script post-start script touch /media/sf_LinuxEducation/post-start sleep 15 touch /media/sf_LinuxEducation/post-start-long end script pre-stop script touch /media/sf_LinuxEducation/pre-stop sleep 15 touch /media/sf_LinuxEducation/pre-stop-long end script post-stop script touch /media/sf_LinuxEducation/post-stop sleep 15 touch /media/sf_LinuxEducation/post-stop-long end script The result is that only one touch is accomplished (the first touch in pre-start). What do I need to change to see one of the touches after the sleep to work? Or Is there an easier way to get this accomplished? Thanks in advance.

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• Hyper-V R2: Need help with disk structure

  - by MojoDK

  Hi all, I'm going to use the free (non gui) version of Hyper-V R2. In my new server I have 8 disks in total (for Hyper-V R2 installation and virtual machine). Atm I'm going to run a single virtual machine, with following tasks: Windows Server 2008 R2 x64 File/Print SQL Server My question is ... with my 8 disks in the server, which disks should contain wich data? Should I install "Hyper-V R2" and VM's drive c on same physical disks? Should I use raid 1 or 5? With the above tasks, how would you structure the disks? Hope you know what I mean (I'm not english, so it's difficult to explain). Thanks!!! Mojo

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• How to deploy Windows-8 Enterprise Apps to other users?

  - by TToni

  Windows-8 (Metro) Apps can be installed using "sideloading", bypassing the Windows store in enterprise environments. In principle this is easy: Once you enabled sideloading (which is automatically done when a Win8-machine joins a domain), you can install a signed appx-Package through PowerShell with the "Add-AppxPackage" command. But there is a catch: The App is only installed for the user who executes the command and there is no "-Credentials" parameter! I can probably solve that problem in my specific scenario, where I deploy a self-developed app through TFS build to a virtual machine with a fixed demo user (by using remote powershell in combination with "Add-Job", which does take a credential parameter and because I know the given username and the password). But that is not true in an enterprise environment, where I want to distribute my App to thousands of users. Cracking all their passwords seems a bit over the top, so what would be the "correct" way to do this? I can't find any useful information from Microsoft about this, but maybe one of you already ran into this problem and solved it?

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• Random greyed unresponsive screen on netbook

  - by user643722

  I love my Asus Eee PC 1000 Ubuntu 12.04 netbook, but I have a little problem. As I use it, the screen will randomly turn grey and become unresponsive. I can then only wait, until perhaps 10-60 secs. later, when I can interact again. Only the bar at the top of my screen retains its colour throughout. I thought it might be Firefox, as I have a lot of tabs open. I installed Chromium, used it instead, and the problem remained. A while back I upgraded from 1 to 2 Gb RAM. So, I thought recently, maybe I should increase the swap-space. I have 738Mb of 7.2Gb free on root; and 2Gb of 28Gb free on my home drive. I bought a 32 Gb SD Card and assigned 4Gb to swap space. cat /proc/swaps reports that the partition is being used. Alas the problem remains. Does anyone know what's wrong with my machine? The SD Card has changed my machine somewhat, but the greying still happens. I ran free -m shortly after another episode, and received: total used free shared buffers cached Mem: 2004 1731 272 0 370 769 -/+ buffers/cache: 591 1412 Swap: 4073 0 4073 Update: Using 'top', I can see that compiz uses about 43% of the CPU (#1 position) when the greying occurs. After the greying, compiz drops back down to its usual 8% of CPU.

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• Oracle Open World 2012?????

  - by Liu Maclean(???)

  Oracle Open World 2012?????: ???.. Oracle OpenWorld 2012 sessions????:Search Content Catalog for Oracle OpenWorld 2012 sessions ?????????session??? Open World 2012??: Larry ??Exadata X3 OOW 2012???Exadata X3,?? X3-2 ?Expansion Rack X3-2?X3-8 Exadata X3????:http://www.oracle.com/us/products/database/exadata/overview/index.html  ORACLE EXADATA Database MACHINE X3-8 sheetORACLE EXADATA Database MACHINE X3-2 sheet Exadata X3-2???????: X3-2?compute db node?????????8?Intel Xeon E5-2690??? ??????????12????16?,???33%????? ???96GB???128GB,????256GB ??????????50% X3-2 cell node??????????????Intel Xeon ??????flash card flash card??????4?,??flash card?????????40%? ???X3-2???22.4TB?flash ,??????flash????????????????????,???10????? CPU???6?,????????Intel Xeon model ????????X2-2??,???600GB???????3TB?????? ??Exadata X3-2?????????,??????????1/4?????,1/8????????????????? Exadata X3-8???????: X3-8???X2-8?????,???X3-8??????????X3-2??,??X3-8?????22.4TB?????? ???CEO??  Engineered to Work Together OOW????? Oracle Open World 2012 ????? Open World 2012 ??:http://www.oracle.com/openworld/index.htmlOpen World 2012 ????:http://www.oracle.com/openworld/register/packages/index.html ??: Sept. 30 – Oct. 4, 2012 9?30?? 10?4? ??:Moscone Center, San Francisco (747 Howard Street, San Francisco, California 94103). ?????Mark Hurd??OOW 2012: How big is oow OOW 2012?????????: Focus On Database Technologies Focus On Real Application Clusters Focus On Exadata Focus On Oracle Database Appliance Focus On Oracle Database Application Development Focus On Oracle Database Security Focus On Big Data Focus On Data Warehousing Focus On High Availability Focus On Oracle Enterprise Manager Cloud Control 12c (and Private Cloud) Focus On Oracle Spatial and Graph Focus On Oracle Database Utilities Focus On Oracle Database Upgrade Focus On Oracle Database Private Cloud Focus On .Net Focus On Oracle Database on Windows Focus On Engineered Systems Focus On Sunday Users Forum

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• Hyper-V Manager - Host Access During a Catastrophe

  - by LonnieBest

  How can I ensure that I can always have Hyper-V Manager access to a Hyper-V server, even in the event that the Active Directory Server is down (in a domain-login environment)? Background: The one that came before me, set up the company's servers as virtual machines on top of a host running Hyper-V Server 6.1 (7601) Service Pack 1. For managing Hyper-V, he installed Window 7 onto a virtual machine (run on the same host) with Hyper-V Manager installed. When the (virtual) Active Directory server (run on this same host) is rebooted, during that reboot, I'm unable to RDP into the Windows 7 virtual machine, and I'm therefore unable to access Hyper-V Manager when the Active Directory server is down. I suspect I can't login because I can't authenticate with the Active Directory Server. I'm going to install Hyper-V Manger onto some addition manager's workstations, but how can I ensure they'll have access in a catastrophe where Active Directory authentication isn't possible?

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• Can't access link in network using fully qualified domain name

  - by user1033715

  I have installed windows server 2003 and configured Domain controller (domain name - xyz.com) and DNS service. for that I have configured fully qualified domain name as server.xyz.com also I have installed apache tomcat with port 8080 on that server and accessed link successfully using "http://localhost:8080", "http://ip address of server:8080", "http://server.xyz.com:8080". but its working for local machine, and when I tried to access it from another machine in same network using "http://ip address of server:8080" its worked for me. but when I tried it using fully qualified domain name i.e. "http://server.xyz.com:8080" it's giving me error, "Could not connect to server.xyz.com" Please guide me getting this setup done. I need to be able to access this link "http://ip address of server:8080" as "http://server.xyz.com:8080" outside my network Any suggestion are highly appreciated..

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• Writing directory: permission denied even though dir seems to be chmodded correctly

  - by Aron Rotteveel

  I am having some trouble creating files in directory on my Ubuntu machine: I added myself to the www-data group in order for me to easily edit stuff in my /var/www dir on my development machine. stat /var/www shows the following: File: ‘/var/www’ Size: 4096 Blocks: 8 IO Block: 4096 map Device: 808h/2056d Inode: 142853 Links: 3 Access: (0775/drwxrwxr-x) Uid: ( 33/www-data) Gid: ( 33/www-data) Access: 2010-12-30 16:03:18.563998000 +0100 Modify: 2010-12-30 16:02:52.663998000 +0100 Change: 2010-12-30 16:03:13.111998001 +0100 Still, it is impossible for me to create anything below /var/www (the only way for it to work is to chmod it to 777. What am I missing?

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• 3.2.0-31-generic version doesn't boot

  - by user92526

  12.04 used to work just fine a month ago. Since August, I installed all of the available updates. Since then my mac-pro is acting weird. If I restart the computer, the screen gets stuck in the purple back ground without any texts. Then if I restart again, I can choose what versions of linux I want to run. If I select 3.2.0-31-generic, the machine gets stuck in a state of blinking cursor. If I boot again to run 3.2.0-31-generic recovery mode, the machine gets stuck in a "..... memory freed End of Stack" mode. I can't boot through this kernel. I have to choose an older version of linux like 3.2.0-12-generic to boot into my mac pro, but I have too boot twice to get into this version. I was wondering --if you could provide me a solution to boot the 3.2.0-31-generic version. -- if you could provide me a solution to boot into any version the first time I restart. (Usually I have to kill the first restart) --- If there is an option in linux to choose what version I want to run every time I restart so that I don't have to choose everytime. Thank you

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• How do I edit files in the console when connecting to windows 7 via ssh?

  - by Alex Waters

  I am using tunnelier client and server to connect to a windows machine. I can get in and have access to all of the files on the computer. I have vim installed on that windows machine, but I can't seem to edit anything via the DOS command line. I also tried editing in notepad, but nothing happens when I enter the command. I think this might be the part where DOS doesn't behave like bash. Would I need to setup cygwin / openssh to accomplish this? (boo, tunnelier is so easy) Thanks! p.s. I know I could just use sftp and edit files that way, but it feels dirty.

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• What is your list of programs to install to Windows after a fresh install?

  - by marked

  I am looking for others' list of program that absolutely must be installed to a fresh install of Windows before going any further. I hope to compile a list here to use as reference for all new Windows installs/restores. Automating this list of programs installation is the next step. Some great lists so far! I will continue to monitor this and then make a list of everything I use. Another thought, has anyone come up with a way to automate this? Possibly going to each programs download page, downloading the most recent version, and installing? I may way on this as well, any ideas would be appreciated! As far as the type of machine, most of mine are hybrids i.e- server, workstation, development machine. So all of the above!

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• Best way to have linux setup for changing distros

  - by Wizard

  Hi there. I am currently using Fedora and looking at switching to Linux Mint Debian Edition. What is the best way to have the machine setup, so changing distro causes the least issues. In that I mean; people usually say having /home on it's own partition is good because then you just format the other partitions and you don't loose anything in home. However what happens then with say Evolution (or other program) configs etc with one version and then when you move to another distro it has other files, this could cause issues? Is there another way to have machine setup?

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• Too many files open issue (in CentOS)

  - by Ram

  Recently I ran into this issue in one of our production machines. The actual issue from PHP looked like this: fopen(dberror_20110308.txt): failed to open stream: Too many open files I am running LAMP stack along with memcache in this machine. I also run a couple of Java applications in this machine. While I did increase the limit on the number of files that can be opened to 10000 (from 1024), I would really like to know if there is an easy way to track this (# of files open at any moment) as a metric. I know lsof is a command which will list the file descriptors opened by processes. Wondering if there is any other better (in terms of report) way of tracking this using say, nagios.

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• mongodb eating 48G in 1min

  - by ledy

  In mongodb i work with this collection: Size 55.93g Data Size 39.82g Storage Size 41.08g Extents 53 Indexes 4 Index Size 9.64g It takes few seconds of mongdb being up with this single collection and all 48GB RAM on the dedicated server are gone. That's worse because there is also a mysqld+nginx/fcgi on this machine which should be allowed to use at least 24GB together. I.e. remaining 24GB, enough for the mongod! However, it does not share in a fair way. Everybody says that the memory for mongod is managed by OS and releases unneccessary space for other processes if they demand RAM. On my machine it is not releasing RAM. What's wrong? free total used free shared buffers cached` Mem: 49559136 49403908 155228 0 57284 47247564 -/+ buffers/cache: 2099060 47460076 Swap: 8008392 164 8008228

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• Remote Desktop Multi Monitor Connection

  - by user196039

  This question may be a bit unusual but I think it's an interesting angle: Why does a remote desktop connection to my server with all four of my 30 inch (@2560x1600) monitors work, even though the server doesn't have a graphics card installed? I guess the graphics are perhaps not really rendered on the server? What exactly happens there so that this works? Searching for this I mostly found "how to enable multi monitor support" but not an answer to my question yet. Any links/documentation I can read to understand this better? (To get all four monitors working well on my local machine the one graphics card I had wasn't even enough, so I have two graphics cards on the local machine now) The operating systems are Windows 7 home premium and it's a Windows Server 2008 R2.

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• Ubuntu 11.10 Random reboots how to find root cause?

  - by Indigo42

  All, This issue started with 11.04, I upgraded to 11.10 this week in hopes it would correct it, but after a few days it happened again.. A few times a day, randomly, my monitors will go black and the machine will come back in the post screen and boot up again. Sometimes it boots up properly, sometimes it boots to disk scan (I understand why...the machine just died with a bunch of stuff open) and sometimes it takes several cycles of this to come up. I connected to the system with my laptop and tailed dmesg, syslog, kern.log, and Xorg.0.log. I also ran a cat /proc/kmesg. Nothing is showing up in any of these log files when it happens..it's just like someone has pulled the plug. I just got through running 4 hours of the memory test with no errors. I have a AMD Phenom 9850 Quad-Core Processor and Nvida 9500GT graphics card. This system has been stable for like 4 years. I'm thinking it might be a hardware problem, but how do I find out? Thanks,

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• ssh on Window Vista and Ubuntu 12.04

  - by Adebayo

  Greeting to all. On my Fijitsu system with intel processor, I could not ssh from my Window Vista partition using PUTTY and also could not ssh from my Ubuntu 12.04 partition. I am try to ssh into a remote machine where I have an account but I always get Connection refused. But from the desktop computer in my office using the same PUTTY I could ssh to remote machine. I have tried to follow several comments but none has worked for me. Please, I need help.

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• Seeing what files are run at startup (linux)

  - by user924

  How do a check what startup scripts are run after I ssh into a machine?

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