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  • Disk names in Solaris 10 for ZFS: SAS WWN instead of c0t0d0

    - by notpeter
    I currently have a server running Solaris 10u9 with a SAS enclosure (Dell PowerVault MD1000) filled with SATA disks attached to an SAS card (LSI 3801E). It happily recognizes the 15 disks in the MD1000 and presents them each disk in the traditional solaris form (c1t12d0, c1t13d0, c1t15d0, etc). My home ZFS setup (Nexenta CP3 + LSI 9200-16E + directly cabled SATA disks) presents disks as their SAS WWN ID (ex: c3t600039300001EA56d0). Although this ID is longer, I've found it much easier to troubleshoot because the cabling/slot is irrelevant, ZFS just identifies the disk by ID, if it's connected it finds it. Most manufacturers print the WWN right on the disk's top label, can't get much easier than that. So how can I get Solaris to identify disks by SAS WWN instead of by the cXtXdX?

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  • How to change harddrive spindown time?

    - by norpol
    if I run my notebook on battery mode, ubuntu spindown my hardrive every few seconds. How can I fix that? I have tried it with sudo hdparm -S 127 /dev/sda* but I am not able to disable the spindown and can´t find the reason for this "bug". Running Ubuntu 12.04 - Bug is since 12.04 Recent updates are installed, the problem is still recent. I can change the settings via. sudo hdparm -B 127 but if I change hdparm.conf, Ubuntu does not recognize it. /dev/sda { apm_battery=127 }

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  • Programming is easy, Designing is hard

    - by Rachel
    I work as Programmer and I feel if design documents are properly in place and requirements are clearly specified than programming is not that difficult but when I think in terms of Designing a Software than it gives chills to me and I think its a very difficult part. I want to develop my Design Skills so, How should I go about it ? Are there any books, blogs, websites or other approaches that SO community can suggest ? Update: By Design I meant Design of overall Application or particular problem at hand and not UI Design.

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  • "Bootmgr is missing...." Upon reboot [closed]

    - by Gabe
    Possible Duplicate: Install/running ubuntu on extarnal HDD with a windows laptop? Ill take you through the steps I did. Sorry if this question has already been resolved, I'm new to Ubuntu and forums in general. I have 2 internal HDDs in my computer, both with Win7. One HDD is my mothers, the other is mine. I did this because she didn't want my games on her computer, and my PCs motherboard took a crap on me, so I set up a dual boot. I also have an external HDD. This is what I am trying to install Ubuntu 12.04 on. I formatted the drive by right clicking it, then selecting "Format". It is now in NTSF format. I downloaded the Windows installer, ran it, and selected "I:/" (my externl hdd) as the install location. The download and installation ran smoothly, and it gave me the reboot prompt. I selected "Reboot now" and my PC rebooted. I was then interrupted by the "Bootmgr is missing. Press CTRL + ALT + DEL TO REBOOT" message. NOTE: I would like to use my HDD for a FULL Ubuntu installation, not the Live (i think thats what its called). I want all my files and settings from Ubuntu saved to the External drive as if it was my only drive. If you need more information just ask. Any help would be appreciated. Thanks in advance.

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  • Limit disk I/O one program creates?

    - by Posipiet
    Hardware: one virtualization server. Dual Nehalem, 24GB RAM, 2 TB mirrored HD. Software: Debian, KVM, virt-manager on the server with several virtual machines that use Linux too. 2 TB Disk is a big LVM, each VM gets a logical volume and makes its own partitions in that. Problem: One of the programs that runs on one of the VMs creates huge disk load. This never was an issue, because the program never ran on such a powerful hardware. Now the CPUs are fast, and lots of I/O is the result. We cant do much against that at the moment, because the tool is a black box. On the other hand, the speedy computation is welcome. The program creates about 5 GB of temp files which get overwritten during the next iteration. Question: How can we limit the disk I/O for the process?

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  • Unable to Boot from USB External Hard Drive

    - by Josh Stodola
    I recently upgraded my main development machine to Windows 7. This involved wiping out my primary boot drive (Windows XP 64-bit) and starting clean. Before I wiped it, I did a direct disk-to-disk copy to a big external hard drive I have. While I have been able to migrate most of the necessary files without any problems, I was wanting to boot from it today to check a few settings. I plugged in the hard drive, rebooted, changed the BIOS to boot from USB-HDD first. But, no mattter what I do, it always boots from my primary drive to Windows 7. I do not see any kind of error message or anything. How can I boot to Windows XP 64-bit on this external hard drive?

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  • Preseed Partman: multiple partitions on one disk /tmp /data /usr swap

    - by Moritz
    trying to get preseeding on 12.04 64bit with what should be a basic setup to work: /dev/sda - the only drive beeing used / - rootfs - 100GB /boot - 1GB /tmp - 10GB /data - should take all available space swap - 10GB - d-i partman-auto/expert_recipe string \ boot-root :: \ 1000 50 1000 ext4 \ $primary{ } $bootable{ } \ method{ format } format{ } \ use_filesystem{ } filesystem{ ext4 } \ mountpoint{ /boot } \ . \ 500 1000 10000 ext4 \ method{ format } format{ } \ use_filesystem{ } filesystem{ ext4 } \ mountpoint{ /tmp } \ . \ 500 5000 100000000 ext4 \ method{ format } format{ } \ use_filesystem{ } filesystem{ ext4 } \ mountpoint{ /data } \ . \ 64 2000 10000 linux-swap \ method{ swap } format{ } \ . \ 500 3000 100000 ext4 \ method{ format } format{ } \ use_filesystem{ } filesystem{ ext4 } \ mountpoint{ / } \ . If i only use the code for /boot,swap and / it works. Also i was wondering weather i have to specify some other recipe name than "boot-root", but trying "thisNameIsNotDefinedInPartman" the result was the same. The Error message displayed by the ubuntu installer is always "no root file system is defined" Thanks for your help, Moritz

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  • How to detect which edges of a rectange touch when they collide in iOS

    - by Mike King
    I'm creating a basic "game" in iOS 4.1. The premise is simple, there is a green rectangle ("disk") that moves/bounces around the screen, and red rectangle ("bump") that is stationary. The user can move the red "bump" by touching another coordinate on the screen, but that's irrelevant to this question. Each rectangle is a UIImageView (I will replace them with some kind of image/icon once I get the mechanics down). I've gotten as far as detecting when the rectangles collide, and I'm able to reverse the direction of the green "disk" on the Y axis if they do. This works well when the green "disk" approaches the red "bump" from top or bottom, it bounces off in the other direction. But when it approaches from the side, the bounce is incorrect; I need to reverse the X direction instead. Here's the timer I setup: - (void)viewDidLoad { xSpeed = 3; ySpeed = -3; gameTimer = [NSTimer scheduledTimerWithTimeInterval:0.05 target:self selector:@selector(mainGameLoop:) userInfo:nil repeats:YES]; [super viewDidLoad]; } Here's the main game loop: - (void) mainGameLoop:(NSTimer *)theTimer { disk.center = CGPointMake(disk.center.x + xSpeed, disk.center.y + ySpeed); // make sure the disk does not travel off the edges of the screen // magic number values based on size of disk's frame // startAnimating causes the image to "pulse" if (disk.center.x < 55 || disk.center.x > 265) { xSpeed = xSpeed * -1; [disk startAnimating]; } if (disk.center.y < 55 || disk.center.y > 360) { ySpeed = ySpeed * -1; [disk startAnimating]; } // check to see if the disk collides with the bump if (CGRectIntersectsRect(disk.frame, bump.frame)) { NSLog(@"Collision detected..."); if (! [disk isAnimating]) { ySpeed = ySpeed * -1; [disk startAnimating]; } } } So my question is: how can I detect whether I need to flip the X speed or the Y speed? ie: how can I calculate which edge of the bump was collided with?

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  • Representing heightmaps, on disk and when drawing

    - by gardian06
    This is a conglomeration question when answering please specify which part you are addressing. I am looking at creating a maze type game that utilizes elevation. I have a few features I would like to have, but am unsure as to some of the implementation. I have done work doing fileIO maze generation (using a key to read the file, and then generate the level based on that file), but I am unsure how to think about this with elevation in the mix. I think height maps might be a good approach, but don't know how to represent them effectively. for a height map which is more beneficial XML(containing h[u,v] data and key definition), CSV (item1 is key reference, item2 is elevation), or another approach that I have not thought of yet? When it comes to placing the elevation values themselves what kind of deltah values are appropriate to have it noticeable at about a 60degree angle while not really effecting gravity driven physics (assuming some effect while moving up/down hill)? I am thinking of maybe going to procedural generation at some point, but am wondering if it is practical to have a procedurally generated grid (wall squares possibly same dimensions as the open space squares), or if designing to a thin wall open spaces is better? this decision will effect the amount of work need on the graphics end for uniform vs. irregular walls. EDIT: Game will be a elevation maze shooter. Levels/maps will be mazes with elevation the player has to negotiate. Elevations will have effects on "combat" vision, and movement.

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  • Using physical disk with VMware Workstation

    - by chx
    I am using VMware Workstation 9.0 under Windows 7 and trying to load my Linux from Physicaldisk0. And it boots, grub sees the two partitions on the disk (I checked in command line) and the kernel and the initrd loads and then it stops saying "device not found"and drops me into an emergency shell. Indeed there is absolutely nothing in /dev not the /sda device it expects not /hda nothing that looks like a disk. Edit: I can boot the Linux disk just fine if I boot it from BIOS and not as a VM. Edit2: The question is, how can I make this setup work?

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  • Dual Boot, Dual Hard Drives!

    - by Mars
    I'm posting this question after reading most of similar ones. My situation is different here in the fact that I'm installing on SSD and not partitioning my HDD, and that I can actually boot! I'm just looking to improve the convenience of having easier way to choose. 1- I have a Dell Inspiron 15R SE. It has HDD (1TB) and SSD (32GB). I managed to do whatever things I did in distant past to set the SSD free (I don't really care how fast my system boots). Now I wanted to install Linux on the SSD and leave the HDD untouched. It's way too precious for me to mess with it. So, I repartitioned the SSD to: 30GB for /root, 1GB for /swap, and 100MB for /boot. I installed Linux on the root and the GRUB on boot (of the SSD). Now GRUB immediately boots into linux and doesn't allow me to boot to Windows. BUT! If I enable UEFI Boot manager and choose "Windows Boot Manager" after hitting F12, I can boot into Windows 8 normally. I'd say that's pretty ok, except, I'd prefer to have the option to boot into which one or at the very least, default to boot to Windows. 2- I'm concerned that if I now delete the SSD partition, that the boot will break and I won't be able to boot anything! Does this seem like a valid concern? I made that choice of having linux on SSD because I'm going to be training on it, so I expect multiple resets from time to time.

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  • Unable to Mount an external hard drive (NTFS)

    - by Mediterran81
    Ubuntu 11.10. When I plug my external Drive Western Digital MyPassport (500Go NTFS) I named WD. I get the following error: Unable to mount WD Error mounting: mount exited with exit code 1: helper failed with: mount: according to mtab, /dev/sdb1 is already mounted on /media/WD mount failed I have no problem with the internal NTFS partitions that auto-mounts on startup (ntfs-config does that). If I plug the WD before I boot Ubuntu, upon login, it's recognized and I can access without no problem. But if I remove it using (Safely remove) and then replug it, I get the error above. Here is my fstab: # /etc/fstab: static file system information. # # <file system> <mount point> <type> <options> <dump> <pass> proc /proc proc nodev,noexec,nosuid 0 0 #Entry for /dev/sda5 : UUID=24540d0f-5803-493c-ace9-e3b3c0cedb26 / ext4 errors=remount-ro 0 1 #Entry for /dev/sda3 : UUID=E4C43F7EC43F51D2 /media/OS ntfs-3g defaults,locale=en_US.UTF-8 0 0 #Entry for /dev/sda2 : UUID=6A0070F10070C61B /media/RECOVERY ntfs-3g defaults,locale=en_US.UTF-8 0 0 #Entry for /dev/sdb1 : UUID=EA6854D268549F5F /media/WD ntfs-3g defaults,nosuid,nodev,locale=en_US.UTF-8 0 0 #Entry for /dev/sda6 : UUID=ed077c52-c50e-406c-9120-9cb6f86ec204 none swap sw 0 0 Here is my mtab /dev/sda5 / ext4 rw,errors=remount-ro,commit=0 0 0 proc /proc proc rw,noexec,nosuid,nodev 0 0 sysfs /sys sysfs rw,noexec,nosuid,nodev 0 0 fusectl /sys/fs/fuse/connections fusectl rw 0 0 none /sys/kernel/debug debugfs rw 0 0 none /sys/kernel/security securityfs rw 0 0 udev /dev devtmpfs rw,mode=0755 0 0 devpts /dev/pts devpts rw,noexec,nosuid,gid=5,mode=0620 0 0 tmpfs /run tmpfs rw,noexec,nosuid,size=10%,mode=0755 0 0 none /run/lock tmpfs rw,noexec,nosuid,nodev,size=5242880 0 0 none /run/shm tmpfs rw,nosuid,nodev 0 0 /dev/sda3 /media/OS fuseblk rw,nosuid,nodev,allow_other,blksize=4096 0 0 /dev/sda2 /media/RECOVERY fuseblk rw,nosuid,nodev,allow_other,blksize=4096 0 0 /dev/sdb1 /media/WD fuseblk rw,nosuid,nodev,allow_other,blksize=4096 0 0 binfmt_misc /proc/sys/fs/binfmt_misc binfmt_misc rw,noexec,nosuid,nodev 0 0 gvfs-fuse-daemon /home/hanine/.gvfs fuse.gvfs-fuse-daemon rw,nosuid,nodev,user=hanine 0 0 Appearently it cannot be mounted because upon login, it finds that it is already mounted. Some sort of conflict. Does anyone have a clue on how to solve this. Thanks.

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  • Virtual PC lost parent disk for differential vhd

    - by SeeR
    2 years ago I had that brilliant idea to create base Windows XP disk which all of my VM with XP will use. Of course it ended that I had only one VM with XP :-). Today I needed to make some free space on my HDD so I found one not used VM named "Windows XP" which had only 5GB. I deleted it as fast as possible :-) and of course I used shift to not use "Recycle bin". Now when I want to run my XP VM I have following error: "One of the parent hard disks of ... is missing." It's not a problem for me as soon as I can restore files from this differential vhd that I have right now. So: I have differential disk with files I need I don't have parent disk My question is: How can I restore files from this differential hvd?

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  • Proof Identify stolen computer getting computer identification info from Launchpad bugs and comparing

    - by Kangarooo
    I sold my old laptop to neighbours and it was stolen from them. Well i think i have found thief so i want to check his computer id and compare it to my old Launchpad bugs id. How in Launchpad i can find from my bugs: Motherboard HDD Somthing else that can help identify it Maybe how to recover or find some overwritten files (couse now there is windows) I found in Launchpad one my bugs has LSPCI autogenerated from bug 682846 https://launchpadlibrarian.net/70611231/Lspci.txt but i dont see any id that can be used to identify specificly my comp. This can be used to identify many same models. Or i missed something in there? And what commands should i use to get all identification on that comp in one go fast? Just lspci? How to get same lspci as it is in that Launchpad link? Now testing laspci on my computer i dont get so much info. Also im now doing a search in my external hdd where i have many backups and maybe i have there result from lspci. So what containing keywords would help doing search with for small lspci and full reports ive done? I might have done sudo lshw somefilename

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  • Why are software schedules so hard to define?

    - by 0A0D
    It seems that, in my experience, getting us engineers to accurately estimate and determine tasks to be completed is like pulling teeth. Rather than just giving a swag estimate of 2-3 weeks or 3-6 months... what is the simplest way to define software schedules so they are not so painful to define? For instance, customer A wants a feature by 02/01/2011. How do you schedule time to implement this feature knowing that other bug fixes may be needed along the way and take up additional engineering time?

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  • Why are software schedules so hard to define?

    - by 0A0D
    It seems that, in my experience, getting us engineers to accurately estimate and determine tasks to be completed is like pulling teeth. Rather than just giving a swag estimate of 2-3 weeks or 3-6 months... what is the simplest way to define software schedules so they are not so painful to define? For instance, customer A wants a feature by 02/01/2011. How do you schedule time to implement this feature knowing that other bug fixes may be needed along the way and take up additional engineering time?

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  • Sata drive overiding IDE?

    - by Aznbinladen
    I recently just bought a Sata Hard drive and hooked it up and installed a OS. I am making it my Primary hard drive. What I had before that though was 2 IDE hard drives that I used. One of them was my Prime and the other one was just a second to keep stuff on. My problem is that now since I hooked up the Sata drive, my IDE drives are not being detected at all. I even tried to remove the Sata drive completely and use my IDE drives, but it couldn't be detected. What should I do? Am I connecting them wrong?

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  • Ubuntu slow on HP 2000 notebook with Apu e1-1200

    - by user169861
    I am using HP 2000 notebook which initially came with Windows 7 64bit. It has 4gb ram, AMD APU E1-1200 (1.4ghz) with Radeon 7310. With Windows it worked ok, so I decided to switch to Ubuntu. I installed 13.04 64bit at first, but responsiveness wasn't that good (opening windows, menus, Firefox, dash search) even if it was way better during the testing from live USB. I tried different kind of drivers for graphic card, 13.6beta, 13.4, fgrlx proprietary, upgraded kernel but the situation was the same. Then I tried installing 32bit version but the results were identical. After that I tried LTS version 12.04 and Xubuntu 13.04.. Responsiveness wasn't that different at all. Not sure what to do, and I wouldn't want to go back to Windows. This machine is not a beast, but it should be enough to deal with Unity or Xfce without troubles. Oh yes, I have insydeH20 BIOS with not so many options at my disposal. Thanks and best regards,

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  • Install Ubuntu on USB + Disk Encryption

    - by snipey
    I want to create an Operating System installed upon a USB instead HDD (4 GB) So I wanted to know if there were any special steps for it or simply choosing usb in installation menu. P.S - I want to do full install and not live boot. And After that I want to encrypt the entire Operating System using TrueCypt , guide already present on their website , I just wanted to know if it would be compatible with this method. THanks :)

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  • How to install Ubuntu 13.10 on Hybrid Disk alongside Windows 8.1

    - by user205691
    I am having trouble installing Ubuntu 13.10 on HP Envy 4-1046tx ultrabook. When i bought this, it came with windows 7 pre-installed, but i upgraded it to 8 and now recently to 8.1. But somehow, i feel 8.1 is slower or something went wrong with the upgrade and made my system slow. I want to try Dual booting Ubuntu 13.10 with windows 8.1 The system recovery drive has windows 7 recovery files. SSD has 4GB allocated to windows 8 (i think for hibernation/rapid start). 25GB of SSD is free and i want to install ubuntu on this SSD pointing it to "/" I will also shrink the windows partition (the only other partition available apart from recovery & SSD) to free up 100GB and allocate this space to "/home" during ubuntu installation. I tried the above steps while on windows 8, but not successful. Ubuntu installation went fine, but the grub was not loaded. I tried to deploy linux via EasyBCD, but after that also, selecting linux in the boot would load grub on command prompt and do nothing. While ubuntu installation, i also deleted the raid drivers with sudo dmraid -rE, but still ubuntu didnt recognize my windows. I think i am missing some steps, so this time i want to do it right with proper info before starting the process. My requirements: dual boot Ubuntu with windows 8.1 c:\ shrinked windows with 300GB on sda1, 100GB for /home on sda1 & ubuntu installed on 25GB SSD volume sda2 (this is mSata i think) GRUB or EFI that helps me load both OS properly without breaking anything SWAP partition can be added if needed on sda1 (4gb?)? I have backed up my drive and have a 16GB usb3.0 with ubuntu loaded. I hope i have mentioned everything i need and know.. All i need now is some guidance and what to do right so that this installation goes as planned :)

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  • Ubuntu will not start due to full partitions

    - by mike
    I left my computer downloading all the night and I did download 35 GB of movies (legal ...). I restarted the computed in the morning then I booted in my encrypted Windows partition for my work. I have left my computer downloading 35GB of files and when I restarted in the morning, I booted Windows. When I tried to access Ubuntu, it failed to boot and in low-graphic mode told me that it won't boot because the partition is full. I tried rescue and it reported 0 MB free. I also cannot delete files with sudo rm as all are impossible due to a read-only file system. I can mount it in Windows but there is a "write protection" there, also. Should I try a live USB?

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  • How to install my current Ubuntu based OS on to an external drive? [closed]

    - by Godel Fishbreath
    Possible Duplicate: How do I install Ubuntu to a USB key? How to copy an Ubuntu install from one laptop to another I have found urls to install ubuntu to a HD. But my current system has been upgraded and updated so often that it does not resemble anything on the web or on my drive disks. So giving my a url to how to install ubuntu will fail. Give me instead 'how to install my current Linux/Ubuntu based system (11.04) and all the upgrades to my external HD. Or alternately how to back up the OS into a bootable external HD. I am looking for either urls or a very complete explanation.

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  • prevent OS X from prompting disk initialization/formatting

    - by Just-A-User.A-Superuser
    i have TrueCrypt partition, when i insert it in OS X, it always prompt me to initialize the hard disk. is there a way to prevent os x from detecting uninitialize hard disk? [UPDATE] by the way, as Truecrypt suggested while i'm in Windows, i must make partitions so the os won't detect the hard drive as uninitialized. Windows respected that the drive already have contents by the mere fact that it has partitions, while OS X thinks that it is still uninitialized. i think OS X is trying to be smart by detecting if each partition has a valid filesystem id/marker

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