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  • How to boot Chromebook from SD card without entering developer mode?

    - by Caleb Strutz
    I have a question. Is it at all possible to install Ubuntu or Chrubuntu onto a SD Card and then boot a chromebook from said SD card? I know this is easily possible, but the chromebook in question belongs to my school, so I cannot enter developer mode, because that would void the license agreement. I don't really care how technical or how many steps this will take, as long as it can be possible. Thanks in advance.

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  • How do I find out which boot loader I have?

    - by binW
    I know Grub is the one installed by default when installing Ubuntu but I am faced with an embedded system running 9.10 Desktop Edition. Following are the contents of lsb-release file ubuntu@ubuntu-desktop:/boot$ cat /etc/lsb-release DISTRIB_ID=Ubuntu DISTRIB_RELEASE=9.10 DISTRIB_CODENAME=karmic DISTRIB_DESCRIPTION="Ubuntu 9.10" but this system does not have Grub bootloader and I want to find out which one its using. So any ideas?

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  • How do I find out which boot loader I have?

    - by binW
    I know Grub is the one installed by default when installing Ubuntu but I am faced with an embedded system running 9.10 Desktop Edition. Following are the contents of lsb-release file ubuntu@ubuntu-desktop:/boot$ cat /etc/lsb-release DISTRIB_ID=Ubuntu DISTRIB_RELEASE=9.10 DISTRIB_CODENAME=karmic DISTRIB_DESCRIPTION="Ubuntu 9.10" but this system does not have Grub bootloader and I want to find out which one its using. So any ideas?

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  • Register Now to the New Oracle Argus Safety 7 Implementation Boot Camp - Tokyo, Japan - Dec 10-13, 2013!

    - by Roxana Babiciu
    Oracle's Argus Safety 7 boot camp is an instructor-led training course which provides a good understanding of how Oracle Argus Safety Standard Edition and Oracle Argus Safety Japan products addresses complex pharmacovigilance requirements and helps ensure global regulatory compliance by enabling sound safety decisions. Oracle Argus Safety's advanced database helps ensure global regulatory compliance thus in turn enabling sound safety decisions. Read more here. 

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  • How do I alter/customize the GRUB boot menu for Ubuntu 12.10?

    - by Kyle Payne
    I use a shared computer, so I need to make it user friendly for my-less-than-computer-knowledgable friend currently have Ubuntu 12.10 installed I would like to change the GRUB menu so that Windows 7 is at the top of the list (thus allowing the automatic timeout to automatically select it on startup) and Ubuntu down below I've already used the information used at { How do I change the grub boot order? } and that didn't work.

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  • What would happen if I did a "Boot to VHD" to a VHD that was configured to run under Hyper-V?

    - by tbone
    Microsoft has a Hyper-V based VM I'm interested in running, however, I don't have access to a Windows Server 2008 machine to try it on, only a Windows 7 Pro x64 machine (Windows 7 does not support Hyper-V). This is the VM in question: This download contains three Windows Server 2008 R2 SP1 Hyper-V Virtual Machine set for evaluating and demonstrating Office 2010, SharePoint 2010 and Project Server 2010. 2010 Information Worker Demonstration and Evaluation Virtual Machine (SP1) http://www.microsoft.com/en-us/download/details.aspx?displaylang=en&id=27417 I came across a somewhat relevant article from Scott Hanselman: Less Virtual, More Machine - Windows 7 and the magic of Boot to VHD: http://www.hanselman.com/blog/LessVirtualMoreMachineWindows7AndTheMagicOfBootToVHD.aspx I realize other options are to convert this VM to a VMWare compatible VM or some of the options to run it under VirtualBox. But instead of those routes, I'm wondering: What would happen if I tried to go the "Boot to VHD" route using this Hyper-V VHD? Is it possible that during the boot process, Windows would simply notice that hardware had changed and adjust accordingly, installing the appropriate drivers and continuing on without a hitch?

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  • What is a good partitioning design/scheme for a multi-boot *nix system?

    - by static
    I'm planning to install Debian on my server. I would like to design the partitioning scheme in such a way, that I could install one or more other *nix distributives on that. So, reading many articles I think this scheme could be a good one for the initial idea of multi-boot: /grub /swap /LVM VG1 (for OS1) -> /boot (LV1) / (LV2) /tmp (LV3) /var ... /var/log /home /LVM VG2 (for OS2) -> /boot / /tmp /var /var/log /home ... (other distros) /LVM VG0 (for data) -> /data (LV1) But I'm confused a little bit now: what should be the labels for these partitions (unique or not) and what should be the mounting points looking as (/home (OS1) mounted to /home as well as /home (OS2)...)?

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  • How to blacklist a PCI device so a system can boot?

    - by Reda Lazri
    I installed Ubuntu 10.10 on someone's computer which it had a 'Connexant Fusion 878A' PCI card installed, the card is problematic, I had to unplug it just to use the Live CD. Now my question is how to know which module to blacklist, so he can use the card in Windows and override it when he boots into Ubuntu. There's a twist, I can't plug it and lsmod it because it won't let the system boot up even in 'Recovery Mode'. Kernel: 2.6.35-22

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  • Is it possible to dual boot Mac OSX Lion with Ubuntu 12.04?

    - by tofu_bacon
    I've read that it can be dangerous for your computer to try to run Ubuntu and that the safest option is to run it on an external hard drive. Is this true? (I don't want to run it through a Virtual Machine.) I would prefer to dual boot it, given that my hard drive has so much space. Update: So does this mean that even if I have Ubuntu installed, that my data would still be at risk due to, say, stability issues?

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  • Apache Shiro, INI-Configuration, Perms per URL: How to get URL params?

    - by Marcus Schultö
    I want to use Apache Shiro[1] in my JSF-Application to perform URL-based authorization checks, configuration done in shiro.ini As I see in the Shiro-documentation[2] there is a way to use a "perms"-filter /remoting/rpc/** = authc, perms["remote:invoke"] In my scenario I want this functionality, but on entity-level[3], where the entity-Id is in the http-request # "Open settings for user with id=123": # /user/settings.xhtml?user_id=123 /user/settings.xhtml = perms["user:update:XXX"] So, how do I do this with Shiro? How to I tell the perms-filter to check for http-params? Or is this supposed to be done in my Realm-Implemenation, concrete by calling FacesContext? [1] https://shiro.apache.org [2] https://shiro.apache.org/web.html#Web-webini [3] This can be done at least programmatically: SecurityUtils.getSubject().isPermitted("printer:query:lp7200") https://shiro.apache.org/permissions.html

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  • Optimum php.ini and my.cnf settings for a small Drupal 7 site on a virtual server

    - by the other dude
    I looking for advice on how to set up the default configuration of php.ini and my.cnf for a small site (100 pages) with very little traffic (300 visitors per day). All pages have a bit of text, some images, no video, no audio, no flash/silverlight, very little javascript and jquery. For tracking I'm using GA and Piwik. The main site database is around 50MB. The site is hosted on a virtual server with 20GB RAM and 6 vCPUs so there's hopefully a lot of muscle to make it run very fast. I don't know much about tweaking php and mysql settings and would appreciate it if your answers can be as detailed as possible. Thanks

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  • Can't see my partitions after grub recovery

    - by dimbo
    I stupidly inserted the windows CD into my dual boot Ubuntu 11.10 / windows xp system. I just wanted to see if I could install windows on my external usb HD, but didn't actually go ahead with the install. It seems like the windows CD messed up my MBR and I had to use boot-repair and the ubuntu 11.10 live CD to gain access to ubuntu again. It seems to boot up a little differently (slower) but works. However, I now cant see any of my partitions in nautilus (there are 3). When I open gparted, it just shows my whole hard drive as unallocated (I know it has a windows partition that works and my ubuntu partition that I am using now). If I insert a usb pen, it is also not visible in nautilus but in gparted shows up as a FAT32 partition (which is correct although I cannot access it). sudo fdisk -l gives the following : demian@dimbo-TP:~$ sudo fdisk -l [sudo] password for demian: omitting empty partition (5) Disk /dev/sda: 320.1 GB, 320072933376 bytes 240 heads, 63 sectors/track, 41345 cylinders, total 625142448 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x877b877b Device Boot Start End Blocks Id System /dev/sda1 * 63 63842309 31921123+ 7 HPFS/NTFS/exFAT /dev/sda2 63844350 133484084 34819867+ 5 Extended /dev/sda3 127636488 133484084 2923798+ 82 Linux swap / Solaris /dev/sda4 133484085 625137344 245826630 83 Linux /dev/sda5 63844352 123445247 29800448 83 Linux /dev/sda6 123447296 127635455 2094080 82 Linux swap / Solaris Disk /dev/sdb: 8100 MB, 8100249600 bytes 12 heads, 40 sectors/track, 32960 cylinders, total 15820800 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0xc3072e18 Device Boot Start End Blocks Id System /dev/sdb1 * 5992 15820799 7907404 c W95 FAT32 (LBA) Here is my grub.conf file. Like I said before, I had to use the 'boot-repair' utility with the live cd to get grub working again. I think that this utility maybe created a new grub for me because the startup is definitely not the same. The screen goes blank for a while, and then the ubuntu loading dots come up for a brief moment (instead of during the whole startup process) before the dektop is displayed. Anyway : # DO NOT EDIT THIS FILE # # It is automatically generated by grub-mkconfig using templates # from /etc/grub.d and settings from /etc/default/grub # ### BEGIN /etc/grub.d/00_header ### if [ -s $prefix/grubenv ]; then set have_grubenv=true load_env fi set default="0" if [ "${prev_saved_entry}" ]; then set saved_entry="${prev_saved_entry}" save_env saved_entry set prev_saved_entry= save_env prev_saved_entry set boot_once=true fi function savedefault { if [ -z "${boot_once}" ]; then saved_entry="${chosen}" save_env saved_entry fi } function recordfail { set recordfail=1 if [ -n "${have_grubenv}" ]; then if [ -z "${boot_once}" ]; then save_env recordfail; fi; fi } function load_video { insmod vbe insmod vga insmod video_bochs insmod video_cirrus } insmod part_msdos insmod ext2 set root='(hd0,msdos6)' search --no-floppy --fs-uuid --set=root 5349ff67-b7b7-489f-a881-ae49c1dcd84a if loadfont /usr/share/grub/unicode.pf2 ; then set gfxmode=auto load_video insmod gfxterm insmod part_msdos insmod ext2 set root='(hd0,msdos6)' search --no-floppy --fs-uuid --set=root 5349ff67-b7b7-489f-a881-ae49c1dcd84a set locale_dir=($root)/boot/grub/locale set lang=en_US insmod gettext fi terminal_output gfxterm if [ "${recordfail}" = 1 ]; then set timeout=10 else set timeout=10 fi ### END /etc/grub.d/00_header ### ### BEGIN /etc/grub.d/05_debian_theme ### set menu_color_normal=white/black set menu_color_highlight=black/light-gray if background_color 44,0,30; then clear fi ### END /etc/grub.d/05_debian_theme ### ### BEGIN /etc/grub.d/10_linux ### if [ ${recordfail} != 1 ]; then if [ -e ${prefix}/gfxblacklist.txt ]; then if hwmatch ${prefix}/gfxblacklist.txt 3; then if [ ${match} = 0 ]; then set linux_gfx_mode=keep else set linux_gfx_mode=text fi else set linux_gfx_mode=text fi else set linux_gfx_mode=keep fi else set linux_gfx_mode=text fi export linux_gfx_mode if [ "$linux_gfx_mode" != "text" ]; then load_video; fi menuentry 'Ubuntu, with Linux 3.0.0-12-generic' --class ubuntu --class gnu-linux --class gnu --class os { recordfail set gfxpayload=$linux_gfx_mode insmod gzio insmod part_msdos insmod ext2 set root='(hd0,msdos6)' search --no-floppy --fs-uuid --set=root 5349ff67-b7b7-489f-a881-ae49c1dcd84a linux /boot/vmlinuz-3.0.0-12-generic root=UUID=5349ff67-b7b7-489f-a881-ae49c1dcd84a ro quiet splash vt.handoff=7 initrd /boot/initrd.img-3.0.0-12-generic } menuentry 'Ubuntu, with Linux 3.0.0-12-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os { recordfail insmod gzio insmod part_msdos insmod ext2 set root='(hd0,msdos6)' search --no-floppy --fs-uuid --set=root 5349ff67-b7b7-489f-a881-ae49c1dcd84a echo 'Loading Linux 3.0.0-12-generic ...' linux /boot/vmlinuz-3.0.0-12-generic root=UUID=5349ff67-b7b7-489f-a881-ae49c1dcd84a ro recovery nomodeset echo 'Loading initial ramdisk ...' initrd /boot/initrd.img-3.0.0-12-generic } ### END /etc/grub.d/10_linux ### ### BEGIN /etc/grub.d/20_linux_xen ### ### END /etc/grub.d/20_linux_xen ### ### BEGIN /etc/grub.d/20_memtest86+ ### menuentry "Memory test (memtest86+)" { insmod part_msdos insmod ext2 set root='(hd0,msdos6)' search --no-floppy --fs-uuid --set=root 5349ff67-b7b7-489f-a881-ae49c1dcd84a linux16 /boot/memtest86+.bin } menuentry "Memory test (memtest86+, serial console 115200)" { insmod part_msdos insmod ext2 set root='(hd0,msdos6)' search --no-floppy --fs-uuid --set=root 5349ff67-b7b7-489f-a881-ae49c1dcd84a linux16 /boot/memtest86+.bin console=ttyS0,115200n8 } ### END /etc/grub.d/20_memtest86+ ### ### BEGIN /etc/grub.d/30_os-prober ### menuentry "Microsoft Windows XP Professional (on /dev/sda1)" --class windows --class os { insmod part_msdos insmod ntfs set root='(hd0,msdos1)' search --no-floppy --fs-uuid --set=root 72A89361A89322A1 drivemap -s (hd0) ${root} chainloader +1 } ### END /etc/grub.d/30_os-prober ### ### BEGIN /etc/grub.d/40_custom ### # This file provides an easy way to add custom menu entries. Simply type the # menu entries you want to add after this comment. Be careful not to change # the 'exec tail' line above. ### END /etc/grub.d/40_custom ### ### BEGIN /etc/grub.d/41_custom ### if [ -f $prefix/custom.cfg ]; then source $prefix/custom.cfg; fi ### END /etc/grub.d/41_custom ### How can I get things back to normal. Thanks, Demian.

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  • Problem recreating BCD on Windows 7 64bit - The requested system device cannot be found

    - by Domchi
    NVIDIA drivers upgrade crashed my Windows 7 installation, so I'm working to undo the damage. What I can do: I can boot Windows install from the USB drive, and I can boot the Hiren's Boot CD. Although automated Windows repair fails, I can get to command prompt when I boot Windows install from USB drive, and I can see my drive and all my data. What I cannot do: I cannot boot into Windows - I get this message: Windows failed to start. A recent hardwware or software change might be the cause. To fix the problem: 1.insert windos cd and run a repair your computer option. File: /boot/bcd Status: 0xc000000f Info: an error occured while attempting to read the boot configuration data. It seems that something is wrong with my /Boot/BCD, so I'm trying to recreate it from scratch. I've tried all the methods detailed here (including Windows repair which fails), and I'm left with the last one (near the bottom of that page). When I type the following command as in the tutorial: bcdedit.exe /import c:\boot\bcd.temp ...it fails with the following error: The store import operation has failed. The requested system device cannot be found. Many Google results say that I must use diskpart to set my partition active, however it's already set as active. Also, when I try this: bcdedit /enum It fails with similar message: The boot configuration data store could not be opened. The requested system device cannot be found. Does anyone know what does that error message mean, and what is the requested system device? I'd like to avoid having to reinstall Windows since all the files on disk seem to be fine.

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  • Solaris10 x86 mirror. Making second disk booteable when failure

    - by Kani
    Did a mirror (RAID1) with Solaris 10 in x86. Everything OK. Now, I´m trying to make the second disk booteable, this is: from grub or in case of failure of disk1. I edited /boot/grub/menu.lst: #---------- ADDED BY BOOTADM - DO NOT EDIT ---------- title Solaris 10 9/10 s10x_u9wos_14a X86 findroot (rootfs1,0,a) kernel /platform/i86pc/multiboot module /platform/i86pc/boot_archive #---------------------END BOOTADM-------------------- #---------- ADDED BY BOOTADM - DO NOT EDIT ---------- title Solaris failsafe findroot (rootfs1,0,a) kernel /boot/multiboot -s module /boot/amd64/x86.miniroot-safe #---------------------END BOOTADM-------------------- #---------- ADDED BY BOOTADM - DO NOT EDIT ---------- title Solaris failsafe findroot (rootfs1,0,a) kernel /boot/multiboot kernel/unix -s module /boot/x86.miniroot-safe #---------------------END BOOTADM-------------------- #Make second disk booteable!!!!!!! title alternate boot findroot (rootfs1,1,a) kernel /boot/multiboot kernel/unix -s module /boot/x86.miniroot-safe But is not working. In the BIOS, when I select "alternate boot" I get: Error 15: 15 file not found also, how to configure to GRUB to make the disk2 to boot in case of error in disk1? Additionally, I did (but not related to GRUB): eeprom altbootpath=/devices/pci@0,0/pci108e,5352@1f,2/disk@1,0:a Here is the output of some commands that may help you: /sbin/biosdev 0x80 /pci@0,0/pci108e,5352@1f,2/disk@0,0 0x81 /pci@0,0/pci108e,5352@1f,2/disk@1,0 ls -l /dev/dsk/c1t?d0s0 lrwxrwxrwx 1 root root 50 Jul 7 12:01 /dev/dsk/c1t0d0s0 -> ../../devices/pci@0,0/pci108e,5352@1f,2/disk@0,0:a lrwxrwxrwx 1 root root 50 Jul 7 12:01 /dev/dsk/c1t1d0s0 -> ../../devices/pci@0,0/pci108e,5352@1f,2/disk@1,0:a more /boot/solaris/bootenv.rc setprop ata-dma-enabled '1' setprop atapi-cd-dma-enabled '0' setprop ttyb-rts-dtr-off 'false' setprop ttyb-ignore-cd 'true' setprop ttya-rts-dtr-off 'false' setprop ttya-ignore-cd 'true' setprop ttyb-mode '9600,8,n,1,-' setprop ttya-mode '9600,8,n,1,-' setprop lba-access-ok '1' setprop prealloc-chunk-size '0x2000' setprop bootpath '/pci@0,0/pci108e,5352@1f,2/disk@0,0:a' setprop keyboard-layout 'US-English' setprop console 'text' setprop altbootpath '/pci@0,0/pci108e,5352@1f,2/disk@1,0:a' cat /etc/vfstab #device device mount FS fsck mount mount #to mount to fsck point type pass at boot options # fd - /dev/fd fd - no - /proc - /proc proc - no - #/dev/dsk/c1t0d0s1 - - swap - no - /dev/md/dsk/d1 - - swap - no - /dev/md/dsk/d0 /dev/md/rdsk/d0 / ufs 1 no - /devices - /devices devfs - no - sharefs - /etc/dfs/sharetab sharefs - no - ctfs - /system/contract ctfs - no - objfs - /system/object objfs - no - swap - /tmp tmpfs - yes - df -h Filesystem size used avail capacity Mounted on /dev/md/dsk/d0 909G 11G 889G 2% / /devices 0K 0K 0K 0% /devices ctfs 0K 0K 0K 0% /system/contract proc 0K 0K 0K 0% /proc mnttab 0K 0K 0K 0% /etc/mnttab swap 14G 972K 14G 1% /etc/svc/volatile objfs 0K 0K 0K 0% /system/object sharefs 0K 0K 0K 0% /etc/dfs/sharetab /usr/lib/libc/libc_hwcap1.so.1 909G 11G 889G 2% /lib/libc.so.1 fd 0K 0K 0K 0% /dev/fd swap 14G 40K 14G 1% /tmp swap 14G 28K 14G 1% /var/run

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  • How to remove USB dependency form the boot process?

    - by vijay.shad
    Hi friend, I have just installed the centos 5.3 on my server machine. It looks for a USB media to boot. But I am not able to figure it out what i have done wrong. Why does it asks for USB media? If I have created a dependency of USB to boot, Is there any way i can remove this dependency. Or I have to reinstall the OS again? Regards, Vijay Shanker Dubey

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  • Is it possible to boot from a passthrough lsi2008 under esxi?

    - by Kurt
    I currently have Solaris 11 Express running on bare metal. I'd like to convert the machine to an ESXI host and run the existing os as a virtual machine. I have ESXI setup, the virtual machine made, if I boot the vm from the recovery disk the drives and lsi2008 controller is visible. Everything looks like it should work, but the vm bios does not seem to try and boot from the controller. Is this just impossible?

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  • How to set up GRUB2 chainloader to other Grub (Fedora, Debian) on GPT

    - by basic6
    I'm trying to set up a dedicated GRUB2 which (chain-)loads another GRUB on a disk with GPT partition table. Relevant partitions: /dev/sda1 BIOS_BOOT /dev/sda2 BOOT (ext2) /dev/sda3 FEDORA (ext4) /dev/sda6 DEBIAN (ext4) I installed Fedora first, using /dev/sda2 as boot partition. Then I installed Debian. The Debian installer recognized the Fedora installation and added it as boot entry, then installed its GRUB into the MBR. While this works for the moment, it's pretty messy, because every Debian update may change the boot config, removing the Fedora entry (tried it) and the other way around. That's why I want both systems to have their own boot loader and one main boot loader (that could reside on /dev/sda2), which loads one of them. This is what I've tried: Moved everything from /dev/sda2 to /dev/sda3/boot Removed /boot mount point in Fedora (so /dev/sda2 isn't used anymore) From a live Linux, installed GRUB2 to the MBR (grub-install --boot-directory=sda2 /dev/sda) Wrote a menu.lst: title Fedora root (hd0,2) chainloader +1 (Again, for Debian) Converted that to a grub.cfg script (grub-menu2cfg or something like that) When booting, actually got a GRUB2 menu with "Fedora" (and "Debian") When selecting any one of those: error: invalid signature Issued "grub-install /dev/sda6" (and ...sda3) from all kinds of live Linux systems, all of which failed with another error message (in the case of the Debian installer, without explanation at all) Added --force to the chainloader line, now it says "loading", then reboots Found douzens of howtos, none of which seem to work for me Since I get the self-made GRUB2 menu on bootup, I've at least successfully installed the first stage of GRUB, right? When trying to chainload, some signature is checked and seems to be wrong - how do I fix it? The boot menus (Fedora with its different Kernel versions and Debian with Debian and Fedora as well) are now on the system partitions (/dev/sda3, /dev/sda6), is there anything else to do on these partitions, so they can be chainloaded? Any help is greatly appreciated.

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  • How to restore windows.old for windows 7

    - by Jim Thio
    I reinstall windows. Then I regret that and want to go back. Fortunately the old windows is stored at windows.old I follow the instruction in http://support.microsoft.com/kb/971760 I did it all with small catches When I insert the windows 7 installer, the drive for installer is X and my hard disk is D rather than C. However, on normal windows operation the drive is C. Only when I boot through CD the partition is assigned to the letter D. There is no file bootsect on my windows installer So I can't do **D:\boot\bootsect /nt60 c:** Which should be changed to X:\boot\bootsect /nt60 C: or X:\boot\bootsect /nt60 D: depending on what it really does. As I said if I boot through windows dvd my hard disk letter is D but normally it's C. I am not even sure what that bootsect does anyway. I also can't do this one Attrib –h –s –r boot.ini.saved Copy boot.ini.saved boot.ini There is no file boot.ini or boot.ini.saved It's hidden but I don't see it if I try to look unhidden files either. Because I simply switch from windows 7 to windows 7 and the directory for windows don't change c:\windows I thought it should still work. Well, it doesn't. When windows restart it only goes to the logo and then restart the computer.

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  • Why does unpartitioned Hitachi HDS5C3020 drive start consuming 50% more power 15 minutes after boot?

    - by Pro Backup
    In a Debian 6.0.6 system there are 74 pieces of 2TB Toshiba DT01ABA200 drives. These drives are identified as Hitachi HDS5C3020BLE630 drives running firmware revision MZ4OAAB0. 64 Drives attached via HP SAS expander cards to an LSI 2008 SAS controller, another 5 drives are connected directly to the mainboard, 4 drives are connected to a Sil based PCI controller and last 1 drive is only powered and has no data cable connected. The controller LSI and Sil card's their onboard BIOS are both disabled and the mpt2sas and sata_sil modules are removed from the Linux debian 2.6.32-5-amd64 #1 SMP Sun Sep 23 10:07:46 UTC 2012 x86_64 GNU/Linux kernel. The mpt2sas module is loaded after boot using a modprobe command in /etc/rc.local. These 74 drives are not partitioned, neither formatted and also not mounted. The system consumes: with 0 drives: 70.6 - 70.9 Watt (also 15 minutes after boot); with 74 drives: 330 - 360 Watt, just after boot (is equivalent to 3.5 - 3.9W per drive in idle state); with 74 drives: 420 - 466 Watt, each time in the 15th minute of uptime (is equivalent to 4.7 - 5.3W per drive in idle state). The drive specification lists 4.7W as read/write, and 3.3W as idle power consumption. The increased power consumption is most likely on the 5V line, because after roughly 1 minute an "over current protection" (OCP) of the power supply (PSU) shuts down the power. The used PSU is a single rail model with an OCP of 122A on the 12V line and 55A on the 5V line. Regression: It doesn't matter whether the drive its APM value is set to disabled or 1 (maximum power saving). The operating system records no read/write activity in /proc/diskstats. The values there are identical (28 read, 0 write operations) as immediately after the modprobe operation. Can't test what happens when booting into the mainboard it's BIOS - to exclude any OS intervention - because the Super Micro X8SI6-F mainboard running firmware 06/27/12 has a bug that incorrectly reads a +74.0 C CPU sensor temperature as "High" in BIOS mode, and shuts down the power after 1 minute. What might be causing the drive read/write activity on all drives in the 15th minute after boot and how to prevent it from happening?

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  • Dead laptop screen rewired to external only right from boot-up?

    - by Wesley
    I have a Compaq CQ50-215CA laptop and after a year and 5 months, the screen is completely distorted now. I plan on removing the screen soon, but I realize that the BIOS screen, OS select and Vista boot sequence are all displayed on the laptop screen rather than the external display. Is there some way to get the laptop to display everything (From boot-up to shutdown) on an external display (VGA port)?

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  • Ubuntu 12.04: Does grub support multidevice boot from btrfs?

    - by Propantriol
    I'm using Ubuntu 12.04 LTS (Precise Pangolin) with grub 1.99. I installed on a RAID10 multidevice BTRFS partition. I thought that multidevice support is included in grub for a while but on boot I'm dropped to a initramfs shell, because it fails to mount root ("invalid argument"). This is actually the same message I get if I want to mount a btrfs volume without executing btrfs device scan. Therefore I wonder: Does Ubuntu's grub version even support boot from btrfs mutlidevice ?

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