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• Tail the filename, not the file

  - by Craig Walker

  In UNIX (OS X BSD to be precise), I have a "tail -f" command on a log file. From time to time I want to delete this log file so I can more easily review it in my text editor. I delete the file, and then my program recreates it after new activity. However, my tail command (and anything else that was watching the old log file) doesn't update; it's still watching the old, deleted log file. I think I understand why this is (file names simply being pointers to blocks of file data). I'd like to know how I can work around this. Ideally, my tail command (and anything else I point to the file) would be able to read the data from the new file when the file name has been deleted and recreated. How would I do this?

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• Hybrid drive not booting faster than a normal HD

  - by Nigel Trotter

  I have used Windows 7 to create an image of my existing standard 160GB HD and copied this image back to a bigger 500GB Seagate hybrid drive. After copying the image to the hybrid I had to resize the partition, which was fine but after rebooting a few times to "teach" the hybrid, I have no increase in boot speed. It still takes 20-25 seconds to close down and then over a minute to start up. Is this something to do with the way the image lays itself on the drive indiscriminately? Do I need to load the OS on the drive from scratch to get the benefits? My PC with an i5 processor, is using AHCI mode.

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• How do I mklink junction + move content from C:\Program Files to D:\Program Files?

  - by Matt

  I have a few applications that absolutely refuse to install into anything but C:\Program Files or C:\Program Files(x86). Changing the registry keys for default install folders doesn't seem to provide any satisfaction and so now I'm wondering about throwing a NTFS junction in there to force these pesky applications to cooperate. There are files currently in use within Windows so it's quite likely I am not going to be able to do this within the active OS. Is there some bootable Windows 7 system tools that would allow me to make this happen? Seems I will need the ability to copy files (with permissions!) from one drive to another, as well as make the junction for Windows.

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• Harvard vs. Von Neumann architecture

  - by user32569

  Hi. Our teacher told us, that Harvard architecture is the most evolved and produced architecture today and towards future. but I thing becouse os massive averhead of x86 and Von Neumann nased ARM systems that actually Von Neumann is the most used architecture today. Yes, MCUs with Harvard are even more produced, but since they all have just minor purpose (compared to x86 and ARM based) that Von Neumann is actually the one. Or is it really Harvard? And second, I know this is strange question, but does any architecture combining both exists? to have separate memory for data and programs, therefore faster instruction processing, but still able to work with these as Von Neumann? To be able o load amd unload programs to program memory on the fly? Isnt this the way the x86 should have go? Or would there be some bottleneck that pure Von neumann solves? Thanks.

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• OpenGL ES 2.0 texture distortion on large geometry

  - by Spruce

  OpenGL ES 2.0 has serious precision issues with texture sampling - I've seen topics with a similar problem, but I haven't seen a real solution to this "distorted OpenGL ES 2.0 texture" problem yet. This is not related to the texture's image format or OpenGL color buffers, it seems like it's a precision error. I don't know what specifically causes the precision to fail - it doesn't seem like it's just the size of geometry that causes this distortion, because simply scaling vertex position passed to the the vertex shader does not solve the issue. Here are some examples of the texture distortion: Distorted Texture (on OpenGL ES 2.0): http://i47.tinypic.com/3322h6d.png What the texture normally looks like (also on OpenGL ES 2.0): http://i49.tinypic.com/b4jc6c.png The texture issue is limited to small scale geometry on OpenGL ES 2.0, otherwise the texture sampling appears normal, but the grainy effect gradually worsens the further the vertex data is from the origin of XYZ(0,0,0) These texture issues do not occur on desktop OpenGL (works fine under Windows XP, Windows 7, and Mac OS X) I've only seen the problem occur on Android, iPhone, or WebGL(which is similar to OpenGL ES 2.0) All textures are power of 2 but the problem still occurs Scaling the vertex data - The values of a vertex's X Y Z location are in the range of: -65536 to +65536 floating point I realized this was large, so I tried dividing the vertex positions by 1024 to shrink the geometry and hopefully get more accurate floating point precision, but this didn't fix or lessen the texture distortion issue Scaling the modelview or scaling the projection matrix does not help Changing texture filtering options does not help Disabling mipmapping, or using GL_NEAREST/GL_LINEAR does nothing Enabling/disabling anisotropic does nothing The banding effect still occurs even when using GL_CLAMP Dividing the texture coords passed to the vertex shader and then multiplying them back to the correct values in the fragment shader, also does not work precision highp sampler2D, highp float, highp int - in the fragment or the vertex shader didn't change anything (lowp/mediump did not work either) I'm thinking this problem has to have been solved at one point - Seeing that OpenGL ES 2.0 -based games have been able to render large-scale, highly detailed geometry

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• Best motherboard power supply combo for backblaze server

  - by jin14

  Building a backblaze server as described in this article. http://blog.backblaze.com/ So 45 hard drives in one box. I'm making it a MSDPM 2010 server so I actually don't even need raid cards in there as MSDPM will figure out how to use all of the hard drives on it's own. So need to know what motherboard, CPU, power supply I should get. Primary hard drive : SSD 128GB Storage : 45 1.5GB sata drives OS : windows 2008 Backup software : Microsoft System center Data protection server 2010 Need to know Which mother board to buy which will support 45 SATA hard drives. Don't need a raid card. Which power supply can power all 45 hard drives, 1 ssd drive, motherboard. Best set of equipment that meets my needs wins

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• Hibernating Ubuntu on EC2 instance?

  - by Dan

  I've got an application I'd like to move to EC2. It will likely spend more than half the day completely dormant, so I'm trying to come up with a good solution for starting and stopping it as needed. It takes a few minutes to start up from nothing, so it would be nice if i could hibernate the OS for quicker resumes. I've seen a couple forum discussions on the topic of hibernation within EC2, but never anything conclusive. Has anyone found a working solution to this, or at least some resources that could help me out?

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• How is the Ubuntu installation supposed to work?

  - by Bob D

  I have given up on installing Ubuntu 12.04.01 for the sixth time. I finally got Windows XP to work again. So I blitzted the Ubuntu partition and the swap partition and was about to install the sixth try when it occurred to me that ought to ask how is is "supposed" to go. My installer will install Ubuntu on the Linus ext4 partition I created by hand in Windows on my C drive. But the installer keeps insisting on installing the OS on my D drive unless I intervene. So if I choose "do something else" it will accept installing Ubuntu on the C drive in the partition I previously created, but it insists on putting the "Device for boot loader installation" on the D drive. I can select a different drive at this point (where I could not with the "along side windows choice) but what drive to I choose??? It lists sda, sda1, sda5, sdb and sdb1. The five times before this all ended in disaster letting the installer choose. So I need human intervention. Where is the safe place to do this. The results from the previous attempts left me with only the Ubuntu that would boot, the boot to windows from the grub menu failed every time. Is there a better version of Ubuntu I can use? Is V12.04.01 messed up? My goal is still to use Wine on it to run PC programs. I would like to find a shell or skin or something that makes it seem like windows but have the security and power of Linux under the good. I have seen this type of system and it worked very well. I know I am getting long winded but I have been though at least four of the seven rings of hell already, so I want this install to be the last.

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• Use router as external high powered Wi-Fi adapter

  - by skywinder

  I need a powerful external Wi-Fi adapter for a couple of days. I heard that some types of router support this mode, allowing me to connect the router to my notebook and just use it as an external Wi-Fi interface. Is it possible to connect a router as an external Wi-Fi adapter? How can I determine it? Updated: My purpose is to set the router to monitor mode and check networks around through my notebook to provide better configuration for my network (power, channels, etc). My internal notebook Wi-Fi adapter is too weak for this purpose. Should I use special drivers for that? If yes, can someone describe, step-by-step, how to do it? p.s. I want to use ASUS RT-N56U as an external Wi-Fi adapter on OS X or Ubuntu.

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• Minimum space required for Server 2008 R1 install?

  - by Chris J

  I'm trying to plan disk space for a virtual environment, and wanting to keep virtual disks as small as possible - mostly as apart from the base OS, the software going onto the VM is less than a few MB, so want to avoid physical disk space going to waste; plus it'll give me an idea of how many VMs I could physically fit in {x}GB of physical drive. For Server 2003, I've had installs on 2GB and 5GB sized virtual disks. However for Server 2008, Microsoft recommends a minimum of 10GB (I assume this is both for x32 and x64). For the record, I will be installing the x32 version. Now I know I could just go ahead and try a small install, but wanted to solicit any practical knowledge as well :-) What's the smallest install of Server 2008 possible? (excluding server core installations).

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• Oracle Database 12c and Oracle Solaris 11 DTrace

  - by Larry Wake

  As you may have heard, Oracle Database 12c is now available for Oracle Solaris and Oracle Linux. Among other things, that means we now have the opportunity to share some of the cool things the Oracle Database and Oracle Solaris engineering teams have been doing together. And here's a good one: In this screencast, Jon Haslam describes how on Oracle Solaris 11, DTrace is now integrated into Oracle Database V$ views to provide a top-to-bottom picture of a database transaction I/O -- from storage devices, through the Oracle Solaris kernel, up to Oracle Database 12c itself: With this end-to-end view, you can easily identify I/O outliers -- transactions that are taking an unusually long time to complete -- and use this comprehensive data to identify and mitigate storage system problems that were previously extremely hard to debug. This is a great example of the power of DTrace, which is just about to celebrate its 10th anniversary in the wild. The screencast has some nice examples of DTrace's power on its own, as well as diving into the DTrace/Oracle Database 12c synergy. There's more, of course.  Over on the OTN Garage blog, Rick Ramsey has put together a nice compendium of ways the OS makes the database scream, and Ginny Henningsen's written an article on the same topic.  And, we've also got an OTN page that digs further into Oracle Database / Oracle Solaris synergies.

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• Can't install or update Ubuntu after using parameter acpi_osi = Linux

  - by Lucas Leitão

  I recently had an issue with my acer 4736z notebook because I was having a blank screen after booting the OS, then someone told me to use the parameter GRUB_CMDLINE_LINUX_DEFAULT = "quiet splash acpi_osi = Linux" after quiet splash inside the grub. It worked for me, but since then I can't install a thing or update anything on Linux because it says Removing linux-image-extra-3.5.0-17-generic ... Examining /etc/kernel/postrm.d . run-parts: executing /etc/kernel/postrm.d/initramfs-tools 3.5.0-17-generic /boot/vmlinuz-3.5.0-17-generic update-initramfs: Deleting /boot/initrd.img-3.5.0-17-generic run-parts: executing /etc/kernel/postrm.d/zz-update-grub 3.5.0-17-generic /boot/vmlinuz-3.5.0-17-generic /usr/sbin/grub-mkconfig: 11: /etc/default/grub: GRUB_CMDLINE_LINUX_DEFAULT: not found run-parts: /etc/kernel/postrm.d/zz-update-grub exited with return code 127 Failed to process /etc/kernel/postrm.d at /var/lib/dpkg/info/linux-image-extra-3.5.0-17-generic.postrm line 328. dpkg: erro ao processar linux-image-extra-3.5.0-17-generic (--remove): sub-processo script post-removal instalado retornou estado de saída de erro 1 Removendo linux-image-3.5.0-17-generic ... Examining /etc/kernel/postrm.d . run-parts: executing /etc/kernel/postrm.d/initramfs-tools 3.5.0-17-generic /boot/vmlinuz-3.5.0-17-generic update-initramfs: Deleting /boot/initrd.img-3.5.0-17-generic run-parts: executing /etc/kernel/postrm.d/zz-update-grub 3.5.0-17-generic /boot/vmlinuz-3.5.0-17-generic /usr/sbin/grub-mkconfig: 11: /etc/default/grub: GRUB_CMDLINE_LINUX_DEFAULT: not found run-parts: /etc/kernel/postrm.d/zz-update-grub exited with return code 127 Failed to process /etc/kernel/postrm.d at /var/lib/dpkg/info/linux-image-3.5.0-17-generic.postrm line 328. dpkg: erro ao processar linux-image-3.5.0-17-generic (--remove): sub-processo script post-removal instalado retornou estado de saída de erro 1 Erros foram encontrados durante o processamento de: linux-image-extra-3.5.0-17-generic linux-image-3.5.0-17-generic E: Sub-process /usr/bin/dpkg returned an error code (1) I already tried to remove older kernels but it gives me the same message. Do you have a clue about what should I do?

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• iSCSI RAID1 on two servers, fail scenario

  - by Franz Kafka

  Hallo, a simple question: Image I have two servers, each server has two disks in RAID1. Now I merge the two arrays with iSCSI to one RAID1 disk. Two questions: Can I do the merging of the 4 disks in one go? I can't image how. First I will have to install the os, and then the raid controller is already set up to RAID1. If a whole server fails the other server would continue working without any problems? Does iSCSI notice that the other server is missing and treet this as if the two disks were broken? When the server comes back online the data is resynced, as if I installed new disks into a array? Can I image that this way? Thanks alot.

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• PDF rendering of images seems to vary from viewer to viewer with blurring?

  - by AndyL

  I'm generating PDF figures in Adobe Illustrator CS5 that include embedded images. I've noticed that the images look dramatically different when I display the same PDF in Preview, Skim or Adobe Reader (I'm on OS X). See screenshots. Adobe Reader displays them "correctly" while Skim and Preview blurs the image out each in a different way. Is there a setting I can set when saving my PDF from Illustrator so that the images are displayed correctly in Skim and Preview? The PDF was generated in Illustrator and saved without any compression or downsampling. The original PDF is here: http://ge.tt/8iZMR2A Adobe Reader 9 Skim 1.3.18 Preview 4.2 Super User's client-side PDF renderer

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• How to add command line arguments to command line arguments in Windows shortcut?

  - by Pawin

  I know I can add a command line argument/option to a shortcut this way; for example: "C:\Program Files\Internet Explorer\iexplore.exe" www.a.com So IE will connect to a.com when it starts up. What I would like to do is to get IE connecting to a.com when I call it through another program like the following: C:\Windows\SysWOW64\ForceBindIP.exe 192.168.1.151 "C:\Program Files\Internet Explorer\iexplore.exe" www.a.com This does not work. IE starts up but doesn't go to a.com. It seems like the argument is either ignored or is understood as an argument of ForceBindIP instead (I'm not sure). What I am trying to do is to create 2 IE shortcuts such each of them binds one IE window to one NIC and one particular website. So adding the www.a.com etc in its startup list won't help. OS is Windows 8. Apologize if this has been asked and answered before. Please suggest keywords for searching if that's the case.

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• How can I check whether a volume is mounted where it is supposed to be using Python?

  - by Ben Hymers

  I've got a backup script written in Python which creates the destination directory before copying the source directory to it. I've configured it to use /external-backup as the destination, which is where I mount an external hard drive. I just ran the script without the hard drive being turned on (or being mounted) and found that it was working as normal, albeit making a backup on the internal hard drive, which has nowhere near enough space to back itself up. My question is: how can I check whether the volume is mounted in the right place before writing to it? If I can detect that /external-backup isn't mounted, I can prevent writing to it. The bonus question is why was this allowed, when the OS knows that directory is supposed to live on another device, and what would happen to the data (on the internal hard drive) should I later mount that device (the external hard drive)? Clearly there can't be two copies on different devices at the same path! Thanks in advance!

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• VPS for Glassfish

  - by Harry Pham

  Our small startup company plan to deploy a web application on Glassfish, I and wonder if some of the experience user out there can answer me couple question. When I shopping for server, I usually look at RAM amount, as GF does required good amount of RAM to run, below are the two sites with significant price different for the same amount of RAM. I wonder why?? Godaddy: http://www.godaddy.com/hosting/virtual-dedicated-servers.aspx?ci=9013 Versus http://entic.net/Servers Does below plan from Godaddy consider good to run GF application. OS: Linux CentOS • RAM: 4 GB • Storage: 60 GB • Bandwidth: 2,000 GB/mo Our web application is a social network, expected to have 2000-4000 users to start with

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• Introducing the New Boot Framework in CE 7

  - by Kate Moss' Open Space

  CE 7 introduces a new boot loader framework, BLDR (platform\common\src\common\bldr\). Some people like its powerful and flexbility, others may feel its too complicate as a boot loader framework. Despite to the favor, it is already there; so let's take a look at its features. Unlike the previous BL framwork (CE7 still provides it in platform\common\src\common\boot\) is a monolithic library, the new framework has more architecture structure. It not only defines main body but also provides rich components, such as filesystem (BinFS/FAT), download transportations, display, logging and block devices: bios INT13, FAL, IDE, Flash ( and etc. Note that in the block device category, the FAL is for legacy FMD/FAL, Flash is for latest MSFlash. Some of you may have encountered MSFlash MDD/PDD compatible partition is hard to created in bootloader and now it provides a clean solution! (Since this is a big topic, I will introduce it in future post) Today, I am going to show you some basic helper components - Image Loading functions. When OS image stored in the block device, it can be a file format, says your NK.BIN in the FAT volume or a RAW format, says the image is programmed to a BINFS partition. For the first one you can use BootFileSystemReadBinFile (platform\common\src\common\bldr\fileSystem\utils\fileSystemReadBinFile.c) and use BootBlockLoadBinFsImage (platform\common\src\common\bldr\block\utils\loadBinFs.c) to load from a partition. Need a sample code? No problem, the BootLoaderLoadOs in platform\cepc\src\boot\bldr\loados.c just provide a perfect example.

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• connect to paltalk server using a proxy

  - by user40026

  Hi I want to use paltalk, which is a kind of chat software, but the ports that this applications uses are closed in my country. What I need to do is to use a proxy server. Unfortunately the software itself does not provide a proxy setting. I though it would be possible to run paltalk on an O.S. installed on a virtual machine (say virtualbox) and configure the network setting of virtual machine to direct all its traffic through a proxy on host Operating system, but I could not find a way to do so neither. can anyone please help me?

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• Digital audio does not work on MacBook Pro

  - by mathk

  I have a MacBook Pro (8,2). Using a TOSLINK cable I have no digital output. Oddly enough, sometime I can hear a glitch when I plug in the cable or when I give it a gentle wiggle. My guess is that the output is not correctly detecting that I have a digital link. So is there a way to force digital audio output on a MacBook Pro? Some say that in the Audio MIDI Setup there is an option but I can't find it. I am running OS X 10.7.5.

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• Intelligent Conflict Detection and Resolution

  - by Doug Reid

  0 false 18 pt 18 pt 0 0 false false false /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:12.0pt; font-family:"Times New Roman"; mso-ascii-font-family:Cambria; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Cambria; mso-hansi-theme-font:minor-latin;} Conflict Detection and Resolution in Oracle GoldenGate11gR2 has gone through a significant overhaul. The improvements that have been made to this area are substantial and will make it easier for customers to implement complex, heterogeneous GoldenGate configurations. GoldenGate has provided methods for conflict detection and resolution for a number of past releases, but at Oracle we have the opportunity to take advantage of some of the great ideas in this area. Oracle has had feature rich conflict detection and resolution framework in other products, which has been implemented in Oracle GoldenGate 11gR2. These improvements are geared toward helping customers more easily implement advanced configurations that require conflict detection and resolution by providing a robust framework for conflict detection for all DML statements and resolution via pre-built methods, all with less code and simpler syntax than in prior releases. Conflict Detection and Resolution in Oracle GoldenGate 11gR2 is available for our supported heterogeneous platforms, which includes Oracle Database, MySQL, Sybase ASE, SQL Server, and DB2 Linux, Unix, Windows, z/OS, plus DB2 on i Series, which is newly supported in this release. Additional information on the Conflict Detection and Resolution capabilities can be found in our documentation. 

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• Old notebook internal display randomly not recognized

  - by jfcfar

  I have an old Acer TM4001 notebook. If the laptop is powered-off, with the lid closed, when I power it on, it generally works. Then, without touching anything, if I reboot the computer the internal display wil not work anymore. To make it working again I need to shut down the pc, close and reopen the lid and then turn it on. If I close and reopen the lid if it is not working after power the pc on, it won't work. When the screen is working, closing and opening it has no effect (the data cable seems ok). The external monitor always works as expected: If the internal display is not detected, the external will be the main (and only) display. This is not OS-related. When the screen is not working I cannot see the POST. What could be the cause for this?

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• Any opinions on Paragon's NTFS for Mac solution?

  - by AngryHacker

  I am currently using the free NTFS-3G to access my NTFS drive from the Mac. It seems pretty stable (except once in the very beginning, it locked up the Mac and corrupted my NTFS drive, which I then fixed with chkdsk from a PC). However, speed is NOT one of its virtues. I've been looking at buying Paragon NTFS for Mac OS X 7.0. Their product comparison PDF claims nearly double the speed (vs NTFS-3G) in almost every category (read, write, etc...). Can someone tell me whether the product is stable and whether the speed claims are true.

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• OLTP Sql Server RAID configuration with 10 disks, allocation Unit and disk stripe size

  - by Chris Wood

  On a new db server I only have 10 disks to play with, The usage is about a booking every 3-5 seconds, so not high volume, I know compromises have to be made, but my initial thoughts are - DISK 1 & 2 - RAID 1 - OS DISKS 3,4,5,6 - RAID 10 - Data, Indexes & TempDB DISKS 7,8,9,10 - RAID 10 - Logs & Backup Full backups will take place when there is virtually no traffic on the website so not bothered about the contention with the logs. disk 3-10 - 8kb NTFS unit allocation size disk 3-10 - 64kb Disk Stripe size does this seems to be sensible, any other considerations I have omitted ? thanks

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• Is it possible to to have all pre-unity effects in latest ubuntu?

  - by iamserious

  I've been an Ubuntu dilettante for a long, long time. It is not my primary OS but I've always had it on all my laptops and desktop machines for over 8 years now. What I really, really like(d) about ubuntu (or linux, for that matter) was the effects - desktop cube, wobbly windows and other such "cool" effects. Needless to say, I was heartbroken with Unity. I gave it the benefit of doubt and tried to like it, tried to love it. Stuck with it for over a year. But I recently came to the conclusion that unity is really not for me. I want my old ubuntu back, with all it's eye candy effects. I tried messing around with ccsm but it only seemed to make the matters worse. Now, I could just install the old version of ubuntu - but getting my bamboo pen and Nvidia to work with it is a son of a.. anyway, the point is, old version of ubuntu is outdated to work with my newer machines. I'd rather have a new version of ubuntu but without unity- I don't know what the eye candy stuff is called - and so my question is this - Is it possible to rid ubuntu of unity and get all the eye candy stuff and if it is not possible, can you please advice me what other linux supports all the effects, please? I've searched high and low for unity alternatives but didn't find any satisfactory solutions; so I think my question is mainly about what other linux flavour is better suited for the task - sorry if it is out of topic.

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