LinuxQuestions.org
Help answer threads with 0 replies.
Go Back   LinuxQuestions.org > Forums > Linux Forums > Linux - Software
User Name
Password
Linux - Software This forum is for Software issues.
Having a problem installing a new program? Want to know which application is best for the job? Post your question in this forum.

Notices

Reply
 
Search this Thread
Old 11-14-2011, 02:36 AM   #1
King_DuckZ
Member
 
Registered: Nov 2009
Location: Rome, IT
Distribution: Sabayon
Posts: 61

Rep: Reputation: 2
Grub2 on removable hard disk


Hello, I have recently installed Sabayon Linux at work on a esata disk, and I have problems at boot if the disk is switched off.

The original configuration of the machine was:
sda1: generic hard disk
sdb1/sdb2: windows 7 partitions

and sdb2 is the boot partition.
Now, I installed my Linux on sdc1, which is the esata disk, and during installation I put grub on sdb.
If sdc is switched off at boot, grub can't load and gets to recovery mode. I would rather expect the usual list to show up normally. I kind of understand what the problem is, but being no grub expert I'm asking for help here!
 
Old 11-14-2011, 04:34 AM   #2
Larry Webb
LQ Veteran
 
Registered: Jul 2006
Location: Crystal Beach, Texas
Distribution: Suse for mail +
Posts: 5,100
Blog Entries: 7

Rep: Reputation: 229Reputation: 229Reputation: 229
You will need to configure grub to partition on sdb, now when you switch off your sdc all that is left is the mbr of your sdb pointing the boot at sdc1 which is no longer there. One solution would be to make a small boot partition on sdb say of 20 meg. If you are using windows 7 I understand its bootloader can be used to boot a linux distro also.
 
Old 11-14-2011, 05:51 AM   #3
King_DuckZ
Member
 
Registered: Nov 2009
Location: Rome, IT
Distribution: Sabayon
Posts: 61

Original Poster
Rep: Reputation: 2
If I don't know much about Grub, I know absolutely nothing about Windows' boot loader That said, I'm interested in the solution of making a 20 mib partition. Can you guide me a little please? Like, what file system should I use, how can I resize the ntfs partition? sdb is an SSD, if that matters.
Also, once I get the partition ready, how do I change the loader in the mbr to point to the new place?
 
Old 11-14-2011, 07:19 AM   #4
syg00
LQ Veteran
 
Registered: Aug 2003
Location: Australia
Distribution: Lots ...
Posts: 12,222

Rep: Reputation: 1019Reputation: 1019Reputation: 1019Reputation: 1019Reputation: 1019Reputation: 1019Reputation: 1019Reputation: 1019
I would suggest you reconsider.
If you proceed as you plan, that external will only be usable on that machine. If you install grub to the MBR of the external, it will be portable in that you can take it to another machine and boot it directly if the BIOS supports external booting.
Let's get some data data on your set-up - go here, do as it says and post the RESULTS.txt
 
Old 11-14-2011, 07:43 AM   #5
Larry Webb
LQ Veteran
 
Registered: Jul 2006
Location: Crystal Beach, Texas
Distribution: Suse for mail +
Posts: 5,100
Blog Entries: 7

Rep: Reputation: 229Reputation: 229Reputation: 229
Quote:
Originally Posted by syg00 View Post
I would suggest you reconsider.
He is right, I did not consider you moving this from one machine to another.

Another thought is using a cd to boot with.

Last edited by Larry Webb; 11-14-2011 at 07:44 AM.
 
Old 11-15-2011, 02:34 AM   #6
King_DuckZ
Member
 
Registered: Nov 2009
Location: Rome, IT
Distribution: Sabayon
Posts: 61

Original Poster
Rep: Reputation: 2
Ok, here is the file you asked:
Code:
                  Boot Info Script 0.60    from 17 May 2011


============================= Boot Info Summary: ===============================

 => Windows is installed in the MBR of /dev/sda.
 => Grub2 (v1.99) is installed in the MBR of /dev/sdb and looks at sector 1 of 
    the same hard drive for core.img. core.img is at this location and looks 
    in partition 1 for .
 => Windows is installed in the MBR of /dev/sdc.

sda1: __________________________________________________________________________

    File system:       ntfs
    Boot sector type:  Windows Vista/7
    Boot sector info:   No errors found in the Boot Parameter Block.
    Operating System:  
    Boot files:        

sdb1: __________________________________________________________________________

    File system:       ntfs
    Boot sector type:  Windows Vista/7
    Boot sector info:   No errors found in the Boot Parameter Block.
    Operating System:  
    Boot files:        /bootmgr /BOOTMGR /boot/bcd /BOOT/bcd /Boot/bcd 
                       /boot/BCD /BOOT/BCD /Boot/BCD

sdb2: __________________________________________________________________________

    File system:       ntfs
    Boot sector type:  Windows Vista/7
    Boot sector info:   No errors found in the Boot Parameter Block.
    Operating System:  Windows 7
    Boot files:        /Windows/System32/winload.exe

sdc1: __________________________________________________________________________

    File system:       ext4
    Boot sector type:  -
    Boot sector info:  
    Operating System:   This is .()
    Boot files:        /boot/grub/grub.cfg /boot/grub/grub.conf /etc/fstab 
                       /boot/grub/core.img

sdc2: __________________________________________________________________________

    File system:       swap
    Boot sector type:  -
    Boot sector info:  

sdc3: __________________________________________________________________________

    File system:       ext4
    Boot sector type:  -
    Boot sector info:  
    Operating System:  
    Boot files:        

============================ Drive/Partition Info: =============================

Drive: sda _____________________________________________________________________

Disk /dev/sda: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes

Partition  Boot  Start Sector    End Sector  # of Sectors  Id System

/dev/sda1               2,048 1,953,521,663 1,953,519,616   7 NTFS / exFAT / HPFS


Drive: sdb _____________________________________________________________________

Disk /dev/sdb: 128.0 GB, 128035676160 bytes
255 heads, 63 sectors/track, 15566 cylinders, total 250069680 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes

Partition  Boot  Start Sector    End Sector  # of Sectors  Id System

/dev/sdb1    *          2,048       206,847       204,800   7 NTFS / exFAT / HPFS
/dev/sdb2             206,848   250,066,943   249,860,096   7 NTFS / exFAT / HPFS


Drive: sdc _____________________________________________________________________

Disk /dev/sdc: 251.0 GB, 251000193024 bytes
255 heads, 63 sectors/track, 30515 cylinders, total 490234752 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes

Partition  Boot  Start Sector    End Sector  # of Sectors  Id System

/dev/sdc1    *          2,048    52,430,847    52,428,800  83 Linux
/dev/sdc2          52,430,848    77,596,671    25,165,824  82 Linux swap / Solaris
/dev/sdc3          77,596,672   490,233,855   412,637,184  83 Linux


"blkid" output: ________________________________________________________________

Device           UUID                                   TYPE       LABEL

/dev/sda1        86CEC90FCEC8F887                       ntfs       WD 1 TB
/dev/sdb1        4CE0728CE0727BD0                       ntfs       System Reserved
/dev/sdb2        1E2A81782A814E29                       ntfs       
/dev/sdc1        a1fce21e-fc0a-4593-b3fe-cd646c9fab62   ext4       
/dev/sdc2        6b8a485f-2416-4303-96df-210a14092745   swap       
/dev/sdc3        0e98187b-f194-4c1f-a5dd-e9f2c111f7d6   ext4       

================================ Mount points: =================================

Device           Mount_Point              Type       Options

/dev/sdc1        /                        ext4       (rw,commit=0)
/dev/sdc3        /home                    ext4       (rw,commit=0)


=========================== sdc1/boot/grub/grub.cfg: ===========================

--------------------------------------------------------------------------------
#
# 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_fonts ###
### END /etc/grub.d/00_fonts ###

### BEGIN /etc/grub.d/00_header ###
if [ -s $prefix/grubenv ]; then
  load_env
fi
set default="${saved_entry}"
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 load_video {
  insmod vbe
  insmod vga
  insmod video_bochs
  insmod video_cirrus
}

insmod part_msdos
insmod ext2
set root='(hd2,msdos1)'
search --no-floppy --fs-uuid --set=root a1fce21e-fc0a-4593-b3fe-cd646c9fab62
if loadfont /usr/share/grub/unicode.pf2 ; then
  set gfxmode=1024x768
  load_video
  # vga= is deprecated, grub2 handles this just fine
  # making grub2 res == linux fb res
  set gfxpayload=keep
  insmod gfxterm
  insmod part_msdos
  insmod ext2
  set root='(hd2,msdos1)'
  search --no-floppy --fs-uuid --set=root a1fce21e-fc0a-4593-b3fe-cd646c9fab62
  set locale_dir=($root)/boot/grub/locale
  set lang=en_US
  insmod gettext
fi
terminal_output gfxterm
if sleep --interruptible 0 ; then
  set timeout=5
fi
### END /etc/grub.d/00_header ###

### BEGIN /etc/grub.d/05_distro_theme ###
insmod part_msdos
insmod ext2
set root='(hd2,msdos1)'
search --no-floppy --fs-uuid --set=root a1fce21e-fc0a-4593-b3fe-cd646c9fab62
insmod png
if background_image /boot/grub/default-splash.png ; then
  set color_normal=white/black
  set color_highlight=magenta/black
else
  set menu_color_normal=cyan/blue
  set menu_color_highlight=white/blue
fi
### END /etc/grub.d/05_distro_theme ###

### BEGIN /etc/grub.d/10_linux ###
menuentry 'Sabayon GNU/Linux, with Linux x86_64-2.6.39-sabayon' --class sabayon --class gnu-linux --class gnu --class os {
	load_video
	insmod gzio
	insmod part_msdos
	insmod ext2
	set root='(hd2,msdos1)'
	search --no-floppy --fs-uuid --set=root a1fce21e-fc0a-4593-b3fe-cd646c9fab62
	echo	'Loading Linux x86_64-2.6.39-sabayon ...'
	linux	/boot/kernel-genkernel-x86_64-2.6.39-sabayon ro init=/linuxrc splash=silent,theme:sabayon vga=791 console=tty1 quiet dokeymap keymap=it domdadm resume=swap:UUID=6b8a485f-2416-4303-96df-210a14092745 real_resume=UUID=6b8a485f-2416-4303-96df-210a14092745 root=UUID=a1fce21e-fc0a-4593-b3fe-cd646c9fab62 docrypt 
	echo	'Loading initial ramdisk ...'
	initrd	/boot/initramfs-genkernel-x86_64-2.6.39-sabayon
}
menuentry 'Sabayon GNU/Linux, with Linux x86_64-2.6.39-sabayon (recovery mode)' --class sabayon --class gnu-linux --class gnu --class os {
	load_video
	insmod gzio
	insmod part_msdos
	insmod ext2
	set root='(hd2,msdos1)'
	search --no-floppy --fs-uuid --set=root a1fce21e-fc0a-4593-b3fe-cd646c9fab62
	echo	'Loading Linux x86_64-2.6.39-sabayon ...'
	linux	/boot/kernel-genkernel-x86_64-2.6.39-sabayon ro single init_opts=single init=/linuxrc splash=verbose,theme:sabayon vga=791 console=tty1 quiet dokeymap keymap=it domdadm resume=swap:UUID=6b8a485f-2416-4303-96df-210a14092745 real_resume=UUID=6b8a485f-2416-4303-96df-210a14092745 root=UUID=a1fce21e-fc0a-4593-b3fe-cd646c9fab62 docrypt
	echo	'Loading initial ramdisk ...'
	initrd	/boot/initramfs-genkernel-x86_64-2.6.39-sabayon
}
### END /etc/grub.d/10_linux ###

### BEGIN /etc/grub.d/20_linux_xen ###
### END /etc/grub.d/20_linux_xen ###

### BEGIN /etc/grub.d/30_os-prober ###
menuentry "Windows 7 (loader) (on /dev/sdb1)" --class windows --class os {
	insmod part_msdos
	insmod ntfs
	set root='(hd1,msdos1)'
	search --no-floppy --fs-uuid --set=root 4CE0728CE0727BD0
	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 ###
--------------------------------------------------------------------------------

========================== sdc1/boot/grub/grub.conf: ===========================

--------------------------------------------------------------------------------
default=0
timeout=10
title=Sabayon Linux (kernel-genkernel-x86_64-2.6.39-sabayon)
	root (hd0,0)
	kernel /boot/kernel-genkernel-x86_64-2.6.39-sabayon BOOT_IMAGE=/boot/kernel-genkernel-x86_64-2.6.39-sabayon ro init=/linuxrc splash=silent,theme:sabayon vga=791 console=tty1 quiet dokeymap keymap=it domdadm resume=swap:UUID=6b8a485f-2416-4303-96df-210a14092745 real_resume=UUID=6b8a485f-2416-4303-96df-210a14092745 root=UUID=a1fce21e-fc0a-4593-b3fe-cd646c9fab62 docrypt
	initrd /boot/initramfs-genkernel-x86_64-2.6.39-sabayon
	savedefault

--------------------------------------------------------------------------------

=============================== sdc1/etc/fstab: ================================

--------------------------------------------------------------------------------

#
# /etc/fstab
# Created by anaconda on Thu Nov 10 18:42:54 2011
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
UUID=a1fce21e-fc0a-4593-b3fe-cd646c9fab62 /                       ext4    defaults        1 1
UUID=0e98187b-f194-4c1f-a5dd-e9f2c111f7d6 /home                   ext4    defaults        1 2
UUID=6b8a485f-2416-4303-96df-210a14092745 swap                    swap    defaults        0 0
tmpfs                   /dev/shm                tmpfs   defaults        0 0
devpts                  /dev/pts                devpts  gid=5,mode=620  0 0
sysfs                   /sys                    sysfs   defaults        0 0
proc                    /proc                   proc    defaults        0 0
--------------------------------------------------------------------------------

=================== sdc1: Location of files loaded by Grub: ====================

           GiB - GB             File                                 Fragment(s)

   0.132469177 = 0.142237696    boot/grub/core.img                             1
  18.184619904 = 19.525586944   boot/grub/grub.cfg                             1
  20.158660889 = 21.645197312   boot/grub/grub.conf                            1
  20.133995056 = 21.618712576   boot/grub/stage2                               1
   7.754722595 = 8.326569984    boot/initramfs-genkernel-x86_64-2.6.39-sabayon  2

=============================== StdErr Messages: ===============================

unlzma: (stdin): Compressed data is corrupt
umount: /tmp/BootInfo0/sdb2: device is busy.
        (In some cases useful info about processes that use
         the device is found by lsof(8) or fuser(1))
  No volume groups found
mdadm: No arrays found in config file or automatically
I'm not really concerned about moving the hard disk around. I'm currently using this config at work because I volounteered to port an existing game to Linux. In order to better convince the boss, I asked for an external drive, that way I can switch it off when I don't work on Linux and save power. You see, they kind of don't know what Linux is here, so opting for the less intrusive option "it's as if it wasn't there" was my best bet - that said, the disk should never leave this computer.
Hopefully, as the maintainer I can start to permanently work on Linux later, but one step at a time
 
Old 11-15-2011, 04:27 AM   #7
Larry Webb
LQ Veteran
 
Registered: Jul 2006
Location: Crystal Beach, Texas
Distribution: Suse for mail +
Posts: 5,100
Blog Entries: 7

Rep: Reputation: 229Reputation: 229Reputation: 229
In your case I would think a boot cd would be the best option, then you would not have to change your bios. There are a lot of tutorials and downloads for (Super) grub2 boot cd in google.
 
  


Reply

Tags
boot, external, grub2, sabayon


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
How can I mount a removable hard disk and make it can be written? spychan Linux - Newbie 2 04-12-2009 07:36 PM
Xubuntu on Removable hard disk somitras Ubuntu 1 05-02-2007 08:20 PM
Removable Hard Disk yyarin Suse/Novell 6 02-20-2007 09:29 AM
How can I reinstall grub into my removable hard disk? whut-linux Linux - Laptop and Netbook 5 09-23-2006 04:24 PM
LAN backup to a removable hard disk chakkerz Linux - Networking 3 12-16-2003 06:11 PM


All times are GMT -5. The time now is 04:35 AM.

Main Menu
My LQ
Write for LQ
LinuxQuestions.org is looking for people interested in writing Editorials, Articles, Reviews, and more. If you'd like to contribute content, let us know.
Main Menu
Syndicate
RSS1  Latest Threads
RSS1  LQ News
Twitter: @linuxquestions
identi.ca: @linuxquestions
Facebook: linuxquestions Google+: linuxquestions
Open Source Consulting | Domain Registration