Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.debian.user > #178078

Re: "Invalid arch-independent ELF magic" in grub after SSD migration

Show all headers | View raw

On Wed, 2017-02-22 at 18:56 +0100, Lucio Crusca wrote:
> Il 22/02/2017 17:40, Tixy ha scritto:
> > On Wed, 2017-02-22 at 09:18 +0100, Lucio Crusca wrote:
> >> I booted a live Ubuntu from CD media, checked with fdisk that every
> >> partition is starting 4K aligned and used the following command to
> >> copy the disk contents:
> >>
> >> dd if=/dev/sda of=/dev/sdb status=progress bs=4K
> >
> > Did you unmount all partitions on /dev/sda and /dev/sdb first?
> 
> Yes I did. But, even if I didn't, I fail to understand how that could break grub.

If the target disk (your SSD) already had partitions with filesystem and
Ubuntu mounted them, then any activity that modified those filesystem
could be written back to the disk at any time, e.g. to the sectors where
grub was copied to it after it was copied there.

At the very least, Ubuntu would cause writes to the SSD due to things
like superblock updates for mount time and count, and possibly access
timestamps in file inodes. But if it's a GUI desktop live CD, I wouldn't
be surprised if there wasn't background file indexing and thumbnailing
tasks running too, writing who knows what to the filesystem.

-- 
Tixy


If you don't think Ubuntu would write to a file-system unnecessarily,
(which I do, because I'm sure it'll have indexing an thumbnailing tasks
running in the backround)


 you coppied it could cause modifications to be written to the SSD at
any time, say to the sectors where grub got copied to. If you don't
think Ubuntu would cause
 Who knows what background tasks Ubuntu has indexi

then you copying a disk image to the SSD could result in corruption if
Ubuntu caused modifications to the SSD to happen in the same sectors
where Grub was. Say a filesystem superblock was near the start of the
original contents, an the loast mount time or file access times were
written out to that after grub was coppied there  

Back to linux.debian.user | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

"Invalid arch-independent ELF magic" in grub after SSD migration Lucio Crusca <lucio@sulweb.org> - 2017-02-22 09:30 +0100
  Re: "Invalid arch-independent ELF magic" in grub after SSD migration Lucio Crusca <lucio@sulweb.org> - 2017-02-22 14:30 +0100
    Re: "Invalid arch-independent ELF magic" in grub after SSD migration Eero Volotinen <eero.volotinen@iki.fi> - 2017-02-22 15:50 +0100
      Re: "Invalid arch-independent ELF magic" in grub after SSD migration Lucio Crusca <lucio@sulweb.org> - 2017-02-22 16:40 +0100
        Re: "Invalid arch-independent ELF magic" in grub after SSD migration Mark Fletcher <mark27q1@gmail.com> - 2017-02-23 00:00 +0100
          Re: "Invalid arch-independent ELF magic" in grub after SSD migration <tomas@tuxteam.de> - 2017-02-23 11:30 +0100
            Re: "Invalid arch-independent ELF magic" in grub after SSD migrationy Mark Fletcher <mark27q1@gmail.com> - 2017-02-23 12:20 +0100
  Re: "Invalid arch-independent ELF magic" in grub after SSD migration Tixy <tixy@yxit.co.uk> - 2017-02-22 17:50 +0100
    Re: "Invalid arch-independent ELF magic" in grub after SSD migration Lucio Crusca <lucio@sulweb.org> - 2017-02-22 19:00 +0100
      Re: "Invalid arch-independent ELF magic" in grub after SSD migration Tixy <tixy@yxit.co.uk> - 2017-02-22 21:20 +0100
        Re: "Invalid arch-independent ELF magic" in grub after SSD migration Lucio Crusca <lucio@sulweb.org> - 2017-02-22 21:50 +0100
          Re: "Invalid arch-independent ELF magic" in grub after SSD migration Lucio Crusca <lucio@sulweb.org> - 2017-02-23 00:30 +0100
  Re: "Invalid arch-independent ELF magic" in grub after SSD migration Richard Hector <richard@walnut.gen.nz> - 2017-02-23 11:10 +0100
  Re: "Invalid arch-independent ELF magic" in grub after SSD migration Stefan Monnier <monnier@iro.umontreal.ca> - 2017-02-23 15:10 +0100
  Re: "Invalid arch-independent ELF magic" in grub after SSD migration Jonathan Dowland <jmtd@debian.org> - 2017-02-23 15:30 +0100
    Re: "Invalid arch-independent ELF magic" in grub after SSD migration <tomas@tuxteam.de> - 2017-02-23 16:10 +0100
      Re: "Invalid arch-independent ELF magic" in grub after SSD migration Stefan Monnier <monnier@iro.umontreal.ca> - 2017-02-23 16:50 +0100
        Re: "Invalid arch-independent ELF magic" in grub after SSD migration <tomas@tuxteam.de> - 2017-02-24 10:50 +0100
          Re: "Invalid arch-independent ELF magic" in grub after SSD migration "Thomas Schmitt" <scdbackup@gmx.net> - 2017-02-24 11:50 +0100
            Re: "Invalid arch-independent ELF magic" in grub after SSD migration <tomas@tuxteam.de> - 2017-02-24 12:30 +0100
              Re: "Invalid arch-independent ELF magic" in grub after SSD migration deloptes <deloptes@gmail.com> - 2017-02-24 17:10 +0100
                Re: "Invalid arch-independent ELF magic" in grub after SSD migration Lucio Crusca <lucio@sulweb.org> - 2017-02-25 10:20 +0100
                Re: "Invalid arch-independent ELF magic" in grub after SSD migration Felix Miata <mrmazda@earthlink.net> - 2017-02-25 10:30 +0100
                Re: "Invalid arch-independent ELF magic" in grub after SSD migration <tomas@tuxteam.de> - 2017-02-25 10:40 +0100
                Re: "Invalid arch-independent ELF magic" in grub after SSD migration Lucio Crusca <lucio@sulweb.org> - 2017-02-25 11:30 +0100
                Re: "Invalid arch-independent ELF magic" in grub after SSD migration <tomas@tuxteam.de> - 2017-02-25 10:40 +0100
                Re: "Invalid arch-independent ELF magic" in grub after SSD migration "Thomas Schmitt" <scdbackup@gmx.net> - 2017-02-25 11:30 +0100
                Re: "Invalid arch-independent ELF magic" in grub after SSD migration deloptes <deloptes@gmail.com> - 2017-02-25 14:40 +0100
    Re: "Invalid arch-independent ELF magic" in grub after SSD migration Stefan Monnier <monnier@iro.umontreal.ca> - 2017-02-23 16:40 +0100

csiph-web