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  • How do I use memmap to reserve memory on boot?

    - by alexl
    Ive got a laptop with some corrupted ram addresses, so I'm trying to use memmap to reserve them before linux boots up. Ive been trying to use memmap=10M$1024M' as a kernel boot option, but linux crashes (with no errors) and restarts. If I use a different syntax for memmap likememmap=1023M@0M` it boots fine. Do I have to specify a certain size block to reserve or could my kernel version not support reserving memory with memmap? Maybe I'm better off using memmap=exactmap, and if so, could somebody point me to a good faq on how to use it?

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  • Is it really necessary to call /bin/sync twice before an unmanaged power-off?

    - by Jeremy Friesner
    Hi all, My company sells an "embedded device" which is implemented as a headless Linux box with ext4 on an internal SSD. Some of our users have a habit of doing a "save current settings" on this box, and then cutting power to the unit as soon as the unit reports that the save completed (ie two seconds later). This was causing occasional corruption of the saved files, as the data wouldn't always get flushed to the SSD before the power went out. So I tweaked my software to run /bin/sync immediately after writing the file (after closing the file handle but before notifying the user that the save completed). This appears to fix the issue, but my coworker says that one call to /bin/sync isn't sufficient, and that to be really safe I ought to run /bin/sync twice in a row. That sounds like paranoia to me... Perhaps a habit from earlier versions of Linux or unix whose sync utility didn't work reliably. Does his advice have merit, or should one call to /bin/sync suffice?

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  • typesetting system

    - by itun
    All my life I used Microsoft Office on Windows for document writing and then Libre(Open)Office on Linux. This is not a bad software, but not perfect and I have some complaints. Now on my usual desktop I have Linux. I heard from people who work a lot with documents of different type and complexity (diagrams, articles, document design, presentation) that latex is a perfect thing. I have spent two days exploring Latex and my opinion as a beginner that it is out-of-date (the concepts of Latex language). The language is not intuitive and sometimes even complex. Can somebody advise another software product for document writing?

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  • Suggestions on providing HA access to an external (fibre) RAID subsystem

    - by user145198
    We are looking at upgrading our storage capacity with an external RAID subsystem that has redundant (2) fibre controllers, each controller has 4 x 8 Gbps fibre ports. I would like to make access to this storage system occur via HA Linux. Ideally I would connect 2 fibre ports from each controller into each Linux server, and then export either NFS or iSCSI via a 10 Gbe interface. I have seen plenty of references to DRBD, however all of those references tend to use block storage that is solely attached to each machine, rather than having a shared block storage device, so I am unsure if DRBD could (or should) be used in this case. Ideas?

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  • 5 of the Best Free Linux MySQL Tools

    <b>LinuxLinks:</b> "For each title we have compiled its own portal page, a full description with an in-depth analysis of its features, a screenshot of the software in action, together with links to relevant resources and reviews."

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  • Project specific help [closed]

    - by Sushant Jain
    Hi friends, I am in final year of engineering with Information Technology branch. I have to make my final year project based on Linux/UNIX platform. But until now i couldn't find any good project idea that will be useful for my future industrial career also. So please help me if you have any good project idea related to any field in Linux that gives us a leading edge in my career. and please suggest me sources that will be helpful to me in making that project. Thanks in advance.....

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  • single sign-on integrating SVN

    - by ramdaz
    I need to authenticate my windows users on to a Linux Server which will act as a primary authentication source. Users need to be authenticated and use their access to run SVN or Mercurial ( with something like Tortoise SVN client), or some versioning system. The versioning system need to be authenticated against the Linux Server's authentication source, and users need to use their Windows login username and password to server. I'd have attempted to do this normally on Samba. But is there a better choice? Also how do you create a roaming profile? That is anyone should be able to access their SVN from any PC as long as they use their right Windows username and password

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  • Using OpenGL Without X-Window System

    - by user366250
    Hell every body , i am newbie in linux programming ( Not Windows ) . i want to know how i can using OpenGL on Linux Platform Without X-Window System , can i send OpenGL Graphics Directly to Framebuffer Device ?! There Is Project Named DirectFB ( Direct FrameBuffer ) . with DirectFB We can do this but DirectFB needs for driver for each hardware and i want to user a graphic card that only have linux driver . what is your suggestion to Me . Thanku.

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  • Choosing a home network layout

    - by James M.
    I have a server, 4 PC's, a network printer, a switch and an ADSL modem. Currently the server runs Red Hat 9 and sits between the internet and the other PCs like in http://upload.wikimedia.org/wikipedia/en/1/12/Sample-network-diagram.png I have bought a new server PC to replace the old one, and I plan to install Fedora Core linux on it. The server acts as web and file server. The PCs all run Windows. Alternatively, I could connect the new server and all PCs to the switch, and connect the switch to the modem. (Sorry, couldn't find an image.) What are the pros and cons of these network layouts? Eg. in terms of reliability, security and flexibility? I am not a Linux guru but know of (and am not afraid of) iptables, dhcpd et al. Thank you for any tips, pointers and links.

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  • Is SmoothWall a good firewall alternative?

    - by Oden
    I found this linux distribution, called SmoothWall. I read its documentation and it looks pretty for me. The only problem is, that I'm not a big linux professional and I have also not a lot of experience but I want to know your thoughts about this "Firewall OS"! Can it be used for small-business environment, with 15-17 PC-s? I would use the server also as cache proxy. Is this a good idea? (I mean, using one server for two things)

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  • Sortie de KDE 4.6 : le nouvel environnement de bureau Linux vise les tablettes et l'embarqué

    Sortie de KDE 4.6 L'environnement de bureau vise les tablettes et l'embarqué Mise à jour du 31/01/11 La nouvelle version de l'environnement de bureau KDE vient de sortir. « Beaucoup de travail a été fait pour améliorer ses performances et sa stabilité », écrit l'équipe de développement dans sa présentation des nouveautés. Avec KDE 4.6, l'accent a été mis sur la mobilité et les systèmes embarqués « en modularisant encore plus les librairies ». « Réduire les dépendances entre librairies et permettre à certaines fonctionnalités d'être désactivées permet aux frameworks KDE d'être à présent facilement déployés sur l...

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  • Converting DOCX files to PDF via SSH without losing formatting

    - by Reado
    I'm struggling to find a solution that will allow me to convert a DOCX file to a PDF without losing or malforming the formatting of the document on CentOS 5.7. I have tried CUPS-PDF but it doesn't work; spool files appear in the /var/spool folder but nothing happens after that. OpenOffice and LibreOffice converted a DOCX to PDF but the formatting was all wrong. However if I print the DOCX to a Windows PDF printer from my Windows 7 workstation, it outputs to PDF absolutely fine. So why can't Linux do the same? I tried to print via CUPS to the Windows PDF printer (shared) but the document appears in the queue as "Remote Downlevel Document" and doesn't print. This only happens when I print from Linux.

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  • GPU Computing - # of GPUs supported

    - by TehTypoKing
    I currently have a desktop with 6 GPUs ( 3x HD 5970s ) in non-crossfire mode. Unfortunately, it seems that Windows 7 64bit only supports up to 4 GPUs. I have not been able to find a reliable source to deny or confirm this. If windows 7 has this limitation, is there a Linux flavor that supports more than 4 GPUs? In-case you are wondering, this is not for gaming but high-speed single precision computing. With this current setup ( if I can find 6gpu support ) I am looking to reach 13.8 Teraflops. Also, my motherboard does support 3 16x pci-xpress gen2 slots... and I have a 1500w powersupply plugged into a 20amp outlet. Windows is able to detect all 6 cores.. although, 2 of which displays the warning "Drivers failed to load". To recap: - Can windows support 6 GPUs? - If not, does Linux? Thank you.

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  • Copy a linux install?

    - by Hailwood
    So short story is that I am wanting to grab my ubuntu install, delete everything from my hdd, repartition my hdd, put my ubuntu install back. Long story is. I finally got my recovery discs, so I do not need to recovery partitions, not the mention my hdd is kinda messy, So I am going to wipe it and put everything back. Thing is I don't want to have to re-install everything, I would rather just copy/paste my ubuntu install if possible. Oh, What I should also mention is that I will be dual booting windows!

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  • How to resize the disk of a Fedora guest VM in VMWare ESXi

    - by Cerin
    How do I resize (specifically increase) the disk size of a Fedora guest VM running under VMWare ESXi 4.1? I have a Fedora 16 VM with an ext4 formatted disk, and I've increased its disk size using the vSphere client from 50GB to about 250GB. I rebooted the guest, and it correctly shows this size using fdisk -l /dev/sda. However, df -H still shows the old size. I've found a few KB articles explaining how to resize partitions for some flavors of Linux, but nothing for Fedora with ext4. That article seems to imply I have to create a completely new partition, and that I can't simply expand the existing partition. Using Gparted, it also prevents me from simply resizing the existing partition. Is this impossible to do under Linux?

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  • xf86OpenConsole: Cannot open /dev/tty0 (No such file or directory)

    - by mazgalici
    root@mazgalici:~# startx X.Org X Server 1.7.6 Release Date: 2010-03-17 X Protocol Version 11, Revision 0 Build Operating System: Linux 2.6.24-28-server i686 Ubuntu Current Operating System: Linux mazgalici 2.6.18-194.26.1.el5.028stab079.2PAE #1 SMP Fri Dec 17 19:34:22 MSK 2010 i686 Kernel command line: quiet Build Date: 10 November 2010 11:25:26AM xorg-server 2:1.7.6-2ubuntu7.4 (For technical support please see ) Current version of pixman: 0.16.4 Before reporting problems, check to make sure that you have the latest version. Markers: (--) probed, (**) from config file, (==) default setting, (++) from command line, (!!) notice, (II) informational, (WW) warning, (EE) error, (NI) not implemented, (??) unknown. (==) Log file: "/var/log/Xorg.0.log", Time: Tue Jan 11 01:28:48 2011 (==) Using config directory: "/usr/lib/X11/xorg.conf.d" Fatal server error: xf86OpenConsole: Cannot open /dev/tty0 (No such file or directory) Please consult the The X.Org Foundation support at http://wiki.x.org for help. Please also check the log file at "/var/log/Xorg.0.log" for additional information. ddxSigGiveUp: Closing log

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  • Why it's not possible to compile on a different OS than end-user OS [closed]

    - by sameold
    I was trying to compile a php extension on Windows and ran into some trouble. I then thought it was possible to do the compilation for Windows on Linux, but turned out that wasn't possible. Can someone explain to me why compiling has to be done on the same OS? I'm trying to understand this topic, specifically because if I want to distribute something, does that mean I have to compile it on all these OSs (Windows 7, Windows Vista, Windows XP, Linux, Mac, etc. etc. etc.) So what makes it not possible to compile for one OS on another? Is it the kernel or what?

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  • Can't install any Linux distro

    - by rstreeter78
    I have been trying to install Ubuntu on my step-son's netbook and I checked and his hard disk seems to be failing and i keep getting an error message that Ubuntu is unable to install due to hard disk failure. I was wondering how and if it is possible to install Ubuntu on this hard disk without it giving me an error message. I have tried the alternate install disk image and the regular desktop image and get basically the same error message. Is there a way to somehow override this and get it installed

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  • Copy large files to multiple machines on a LAN

    - by Jonathan Callen
    I have a few large files that I need to copy from one Linux machine to about 20 other Linux machines, all on the same LAN as quickly as is feasible. What tools/methods would be best for copying these files, noting that this is not going to be a one-time copy. These machines will never be connected to the Internet, and security is not an issue. Update: The reason for my asking this is because (as I understand it) we are currently using scp in serial to copy the files to each of the machines and I have been informed that this is "too slow" and a faster alternative is being sought. According to what I have been told, attempting to parallelize the scp calls simply slows it down further due to hard drive seeks.

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  • What determines the time to first ping response in an OS?

    - by Stuart Woodward
    When a server (say Windows, Linux) is rebooted, it will take some time to respond to ping. I'm assuming that the software firewall has to be up before pings will be returned as there might be a setting to disable ping responses. Everyone knows that Windows and Linux have have totally different architectures so lets treat them separately. The answer I'm looking for is "After XXX is running, pings will be returned." It would be helpful to know where in the boot order this is too. i.e. at the start or end. I ask because we get questions from a customer about why it takes so long to respond to ping after creating a Virtual Machine. I'm sure this is just an artefact of the OS boot behaviour.

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