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• RAID setup for maximizing data retention and read speed

  - by cat pants

  My goals are simple: maximize data retention safety, and maximize read speeds. My first instinct is to do a a three drive software RAID 1. I have only used fakeraid RAID 1 in the past and it was terrible (would have led to data loss actually if it weren't for backups) Would you say software raid 1 or a cheap actual hardware raid card? OS will be linux. Could I start with a two drive raid 1 and add a third drive on the fly? Can I hot swap? Can I pull one of the drives and throw it into a new machine and be able to read all the data? I do not want a situation where I have a raid card fail and have to try and find the same chipset in order to read my data (which i am assuming can happen) Please clarify any points on which it sounds like I have no idea what I am talking about, as I am admittedly inexperienced here. (My hardest lesson was fakeraid lol) Thanks!

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• Get off greylisting (the reason why our emails bounced back)

  - by user34402

  Hello, I'm system administrator in online store. We send several emails to our clients after purchase: confirmation, invoice and sale notification to our staff. Recently we got most of emails bounced back and some bounces describes a reason as greylisting, others - just general failure. It is ruining our business because clients are calling that they didn't get the emails with confirmation and invoices. How to get off greylisting, and to not be greylisted? What actions should we do? Mailserver is dedicated machine using Mailenable on Win 2003. Thanks.

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• Cygwin creates files with special (shared) icons on windows

  - by barjonah

  I use cygwin to transfer files between linux and windows machines. Everytime I transfer a file to a windows machine it adds an extra shared user icon on the file's or folder's icon itself. This also happens if I create a file from cygwin on windows using pretty much any command: echo, vim, nano, cat. This is what the cygwin-created folders (and files) look like. This is what a normal folder (or file) looks like. I'm thinking it has to do with permission, because I'd have to chmod it everytime if I want other applications to access the files or folders on windows. How can I tell cygwin to create regular ol' files just like a user or any program would?

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• Mysterious "media" volume mounted on desktop Mac OS X

  - by Allen

  I have a mysterious volume mounted on my desktop that I can't seem to forcibly unmount. I've tried using umount and also diskutil, but it seems to automatically remount itself. I've copied my hdd with Time Machine, and copied it onto a new computer, and it also has the drive mounted on it. It's not pointing to anything and I can't open it, nor can I forcibily remove it by hand with rm -Rf. Any ideas? I noticed this problem after I upgraded to Mountain Lion from Lion. It causes problems because when I try to select a file using the built in Finder dialog box, it freezes for a few minutes because it tries to cache or read into the "media" mounted volume.

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• Cannot usermod -L in LightDM scripts

  - by user95723

  I'm running Xubuntu 12.04 and use the LightDM. I want to restrict access to the machine as a kind of parental control. This is how it should work I hook in a script that executes just before the greeter comes up. Within that script some awk processing will read an entry in a config file and will trigger a usermod -L or usermod -U depending on whether the user is allowed to login. While user is logged, a cron job will count down the entry in the config and forces a xfce4-session-logout if time is up. A cron job running on a server will upload the "credits" on a daily base. How is this idea? That's theory, now for the problems It appears for some unknown reason, the usermod command is not executed, neither as part of a display-setup-script nor within the greeter-setup-script. I wrote a small sandbox script usermod -L johndoe 2error.txt touch /etc/blabla 2error.txt The script is executing, cause the blabla file is existing. That means that the script must have been executed with root privileges. error.txt is empty but the usermod command has just no effect. Is this a bug or a feature. What's wrong? Best regards and thank you Oli

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• nslookup returning different results

  - by Sterno

  I'm having a problem with my machine. A site that I used to be able to access is no longer being found. After running nslookup, I notice that about 9 times out of 10 it returns a specific IP which times out if I ping it, but about 1 in 10 times it returns a different IP which works when I ping it. I've even tried adding an option parameter into nslookup to hit different DNS servers (such as Google's public DNS) and am getting the same result. Any idea what would cause the IP returned by DNS lookup to change back and forth like that?

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• How to shut down the computer without the update on Windows 7?

  - by Jian Lin

  Sometimes when my Win 7 machine has programs that crashed, maybe Firefox, or IE, I would like to shut down the computer without installing any Windows update. That's because I worry that if IE or Firefox crashed, the system is not in a very stable state, so I would rather install the update later. But it seems I only have 2 choices: 1) Shut Down and it always will do any Update 2) Restart, and no update is done (these are 2 choices among the shut down / log off option) So is there a way to Shut Down without doing the Update? Or must I restart first, and then do the Updates, and then Shut Down?

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• How to get monitor resolution of 1680x1050 using ATI Radeon HD 2600 PRO in a dual monitor setup

  - by user7651

  I have Sapphire ATI Radeon HD 2600 PRO graphics card in my Windows Server 2008 x64 machine. It has two outputs a VGA and a DVI. I have connected the DVI to my Dell 24" monitor with 1900x1200 resolution and it works 100%. The VGA I have connected to my second monitor a Samsung 22" with native resolution of 1680x1050. But the ATI driver and Catalyst control centre doesn't show this resolution as an option. If I choose a lower resolution like 1280x1024 it looks really bad and fuzzy. I searched in google and downloaded the powerstrip tool that allowed me to create a custom resolution of 1680x1050 and then this option shows up in Catalyst control centre and my 2nd monitor works fine now. But I don't want to pay for an application to choose a display resolution. Why doesn't ATI show me that option by default even though it has no problem in actually supporting the display at resolution. Is there a way to get 1680x1050 resolution using ATI drivers only ?

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• Can I pass HTTPS traffic from one port to another?

  - by Kit Sunde

  I'm doing a proxy_pass in nginx on port 80 to 8000 on my remote server, and then a port forward from 8000 to 80 from the remote to my localhost. This works great, but I'd also like to do it with https but it seems like nginx needs a valid cert to pass the traffic on. Is there a way for my remote server to simply forward the trafic from port 443 to say 8443 (and then I'll forward remote 8443 to local 443). Then terminate ssl on my development machine instead instead of needing to do it on the remote server? My remote runs ubuntu and my localhost runs osx.

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• Cloning from a given point in the snapshot tree

  - by Fat Bloke

  Although we have just released VirtualBox 4.3, this quick blog entry is about a longer standing ability of VirtualBox when it comes to Snapshots and Cloning, and was prompted by a question posed internally, here in Oracle: "Is there a way I can create a new VM from a point in my snapshot tree?". Here's the scenario: Let's say you have your favourite work VM which is Oracle Linux based and as you installed different packages, such as database, middleware, and the apps, you took snapshots at each point like this: But you then need to create a new VM for some other testing or to share with a colleague who will be using the same Linux and Database layers but may want to reconfigure the Middleware tier, and may want to install his own Apps. All you have to do is right click on the snapshot that you're happy with and clone: Give the VM that you are about to create a name, and if you plan to use it on the same host machine as the original VM, it's a good idea to "Reinitialize the MAC address" so there's no clash on the same network: Now choose the Clone type. If you plan to use this new VM on the same host as the original, you can use Linked Cloning else choose Full.  At this point you now have a choice about what to do about your snapshot tree. In our example, we're happy with the Linux and Database layers, but we may want to allow our colleague to change the upper tiers, with the option of reverting back to our known-good state, so we'll retain the snapshot data in the new VM from this point on: The cloning process then chugs along and may take a while if you chose a Full Clone: Finally, the newly cloned VM is ready with the subset of the Snapshot tree that we wanted to retain: Pretty powerful, and very useful.  Cheers, -FB 

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• Cron process not starting

  - by vkris

  I have an ec2 image created with cron jobs. These jobs fail to run; I discovered the cron process in itself has not started. So, I included /usr/sbin/cron in /etc/rc.d/rc.local and created another image. But still for some reason the cron process does not start on bootup. If I restart the machine, the cron process runs. It doesn't run when it boots up! Any reason why this is happening? Also, is there any other alternatives for this ?

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• Can we change control of two keys on keyboard?

  - by mr_eclair

  I'm using Eliteook 8440p hp machine and two keys on my keyboard aren't working v and b. laptop keyboard replace will take 2-3 days, and I can't stop my office work. I'm bored of using On screen keyboard to write v and b. I don't have any portable USb keyoard to connect to laptop right now. I'm thinking I'm not using Pg up and Pg Down button at all, is there any software or trick which can make it possible so that If i press Pg Up it will write v on page and Pg Down will write b. Hoping for quick and positive response.

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• How can I pin point a USB file transfer bottleneck in Unix?

  - by HankHendrix

  I'm experiencing very slow data transfer speeds over USB 2.0 on my nix box and was wondering how I can pin-point the cause of the problem. I've looked into iotop and top but the cpu and mem figures look normal (compared to guides I have checked). The box which is affected is Ubuntu 12.04 32bit Server running on an Asus EEE 701 2G model and I am transferring from the OS over USB 2.0 to an external HDD (which transfers at 30MB/s+ on Windows 7 on other machine). I get rsync write speeds of 1MB/s from OS to USB HDD which seems ridiculously slow. These speeds are consistent with other USB HDDs and sticks.

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• What would cause a single working website to not work on 1 out of 5 devices on a network?

  - by th3dude

  There is a specific website that loads up without problem on all machines on my network (both wired and wireless) except one laptop. This laptop is a Windows 7 machine that was just recovered using the recovery partition, so it is fresh. The site will not load in Firefox 3.6 or IE 8. The website is http://www.weightwacthers.com The site loads fine on my desktop, iPhone, and Droid, but not the laptop. In all my years in this business I've honestly never seen this happen. Also, 'Is it down for me or everyone' reports that it is indeed only me. What would cause this to happen?

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• How to scrub a document of all text between brackets with find and replace

  - by sam

  I have a log file and I need to find all instances of <password> hash here </password> and remove the hash and replace it with some dummy text like aaa-aaa-aaa-aaaa. The recurring search argument is anything that matches a bracket that starts with <password> and ends with </password>. All the hashes being replaced will be different. What's the easiest way to go a bout this? The log is on a windows machine. Probably easiest would be to use MS word for me, unless it's achievable with wordpad, notepad, or some other light weight editor like textpad. thanks

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• large RAID 10 vs small RAID1

  - by user116399

  The machine will store and serve millions of small files (<15Kb each), and all those files require a total storage space of 400G Considering the exact same SATA hard drives maker and models, on the exact same environment (OS, cpu, ram, raid controller, etc...) which one of the setups bellow would be faster? A) RAID 1 with 2 drives of 2T each, making up total storage of 2T B) RAID 10 with 4 drives of 2T each, making up total storage of 4T [EDIT]: I'm aware RAID10 is faster than RAID1. The larger the disk, at least in theory, the longer will take to do seeks/writes. So, will the performance gain of RAID10 will be outweighed by the "drag" caused the larger disk area when seek/write operations happened?

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• Windows 8.1 will not go back to sleep after waking up

  - by per

  I have problems putting Windows to sleep and starting the screen saver on my new Windows 8.1 machine. Sleep mode and screen savers work only when the computer is first powered up (or restarted). But once it goes to sleep (manually or automatically) and I wake it up later, it wont go back to sleep again and I can't use screen savers either. I updated the chipset and graphics card drivers. My computer isn't part of a homegroup either. Does anyone else have similar issues? Thanks for your advice, per

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• How to print index in a 'for-loop' being executed in remote host through SSH?

  - by YShin

  I want to ssh into a remote host, and then execute a for loop that goes through sequence of numbers to control number of different nodes. ssh user@host /bin/bash << EOF for i in {1..10} do echo $i done EOF If I do this, the output is just 10 blank lines, instead of printing out numbers from 1 through 10. If I execute same code on my local machine, I get the desired output which is ten lines each line printing from 1 through 10. How would one achieve the intended functionality, that is accessing the index in a for loop that is being executed in SSH?

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• How to Split a Big Postscript file (3000 pages) into one individual file per page (using Windows 7)?

  - by Pablo

  Hi, I'm having trouble doing the following: I have a big PDF file that I converted to postscript (for commercial printing). The resulting file is too big to be processed by the printer (machine). I've been trying to find a way to either: Convert from the original (many pages) PDF file to many Postscript file (one postcript file per PDF page in original PDF file(. Convert from PDF to PS (or even EPS). - I managed to do this Then split the PS file into a collection of smaller files. I've tried using Ghostscript, but it is all gibberish to me. Thanks. PS. If you have a good GS tutorial (for dummies?), please share the link.

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• EXT4 external hard drive for use with multiple systems

  - by EXTdumb

  I recently bought a external hard drive to store some data on. I use Linux but I am not a power user. If I format the drive to EXT4, is it possible for the permissions to ever screw up and I lost access to my data? I will be plugging the drive into several different linux based computers at work and I frequently hop distros on my main home machine. I need to make sure I don't lose any data because I overlooked something. I am not familiar with EXT 3 or 4. So far I have done this : Formatted drive to EXT4 ran gksudo thunar and changed the permissions to my user account and all settings to read/write Wrote all the files I need to the drive I really appreciate any help.

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• How can I test linkable/executable files that require re-hosting or retargeting?

  - by hagubear

  Due to data protection, I cannot discuss fine details of the work itself so apologies PROBLEM CASE Sometimes my software projects require merging/integration with third party (customer or other suppliers) software. these software are often in linkable executables or object code (requires that my source code is retargeted and linked with it). When I get the executables or object code, I cannot validate its operation fully without integrating it with my system. My initial idea is that executables are not meant to be unit tested, they are meant to be linkable with other system, but what is the guarantee that post-linkage and integration behaviour will be okay? There is also no sufficient documentation available (from the customer) to indicate how to go about integrating the executables or object files. I know this is philosophical question, but apparently not enough research could be found at this moment to conclude to a solution. I was hoping that people could help me go to the right direction by suggesting approaches. To start, I have found out that Avionics OEM software is often rehosted and retargeted by third parties e.g. simulator makers. I wonder how they test them. Surely, the source code will not be supplied due to IPR rgulations. UPDATE I have received reasonable and very useful suggestions regarding this area. My current struggle has shifted into testing 3rd party OBJECT code that needs to be linked with my own source code (retargeted) on my host machine. How can I even test object code? Surely, I need to link them first to even think about doing anything. Is it the post-link behaviour that needs to be determined and scripted (using perl,Tcl, etc.) so that inputs and outputs could be verified? No clue!! :( thanks,

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• nVidia 9800 GTX+ X11 fails to initialize. no unity or lightdm

  - by rlemon

  I have just upgraded my work pc to 12.04 (not upgrade, fresh install), installing updates during the install, and after everything has loaded (with no errors) and I restart I get brought to console 1 tty login. Console 7 looks like this: IIRC I did not have to finagle with my drivers on 11.10 to get this card working. If this is in fact a driver bug I will remove this post and submit the bug but i'm not 100% confident that it is. I attempted to run unity --reset and got this: Lastly I tried $ sudo apt-get install nvidia-current which tells me nvidia-current is already the newest version. so I ran $ sudo dpkg-reconfigure nvidia-current which says /usr/sbin/dpkg-reconfigure: nvidia-current is broken or not fully installed. Anything I can try from here would be awesome. Currently the only way to get the system up and running was to shut down, plug one of my monitors into the onboard video, enable the onboard video card from the BIOS, then boot back up (and on my single monitor everything is fine). update So I have been able to boot fresh with the ext card plugged in as long as I don't take the updates with the install. past this if I only install the nvidia drivers (nvidia-current or nvidia-current-updates) from the main server (or canadian) I then get the problems.. My proposal; which I don't know where to look for: Can I try installing the previous version of this driver? In the past, on another machine I had issues with my NIC driver being funky... downgraded to the previous driver and bam everything was merry and well.

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• Maximum hard drive space for an Xserve G5

  - by wjlafrance

  At my college we're upgrading an Xserve G5 (RackMac3,1) to be a file server for some courses. Currently it has one sled with a 75GB drive. Obviously, this isn't enough. I've tried some Googling on this matter and I'm hearing a ton of different stuff - custom firmware, size issues, etc. So, for anyone who knows, what's the actual lowdown on this machine. We want to put in three 2TB drives using three standard sleds, replaced with third-party drives. Is this possible?

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• Default maximum heap size -- Ubuntu 10.04 LTS, openjdk6-jre

  - by sachin

  I just installed openjdk6-jre on Ubuntu 10.04 java version "1.6.0_20" OpenJDK Runtime Environment (IcedTea6 1.9.2) (6b20-1.9.2-0ubuntu1~10.04.1) OpenJDK 64-Bit Server VM (build 19.0-b09, mixed mode) Every time I run "java" I get this error: Error occurred during initialization of VM Could not reserve enough space for object heap Could not create the Java virtual machine. This can be solved by specifying a maximum heap size and running "java -Xmx256m" But is there anyway to permanently fix this error (i.e. set the default heap size to 256MB so that I do not need to specify the max heap size every time I run the command)

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• Windows 8 / Server 2012 RDP connection is slow

  - by Chris

  I recently installed Windows Server 2012 for development purposes at our office and noticed immediately that connecting via RDP is slow. It can take 5-10 seconds to connect at times, where as connecting to any of our Win7 or Win2008R2 boxes takes at most 1-3 seconds. At first, I chalked this up to the box itself needing a driver update or something, but just yesterday, I installed Win8 on my desk PC and connecting from home to that machine produces the same result. There is a 3-4 second pause at "securing remote connection" and then again at "configuring remote session". I don't see any warnings in the event log, and once connected, there do not appear to be any performance issues. Is there a known problem with RDP connections on Windows 8 systems? Anything I should look for?

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