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Re: Disk failure, XFS shutting down, trying to recover as much as possible

Always consider using ddrescue [1] instead of dd - especially once you are not sure about the state of the drive.
Tool ddrescue is taking 'dd' image of the drive, but will skip all the areas where the read will return an error. Standard 'dd' will try to continuously re-read that area which could cause more damages.
Have fun! ;-)

[1] http://www.gnu.org/software/ddrescue/


On Fri, Jun 12, 2015 at 1:20 AM, David Christensen <dpchrist@holgerdanske.com> wrote:
On 06/11/2015 12:32 AM, Alejandro Exojo wrote:
Yesterday I found out that my extra disk shut down. I don't know what steps to
follow from now on. I'm searching online about the error as I found in the
logs, and I don't know what steps to follow.
I don't know where to proceed from here. The error seems hardware, but I'm not
totally sure. After that, what should I try to do to recover as much as
possible? I'm reading about ddrescue now.
I don't have space in the other partitions to hold all the data in the failed
disk, but I'm only interested in recovering some parts of it as safely as
possible. Should I just buy a new disk, try to replicate the original one
there, and find out which files are damaged? Or should I create an image as a
file stored somewhere else?

1.  Buy a large disk that you can use for backups.  I use 3 TB Seagate ST3000DM001 because they have the best gigabyte/dollar ratio that I am aware of.

2.  Try to mount the file system and backup your files.  If you can't get the filesystem mounted, copy the raw disk image to a file using 'dd'.  You might have to get the image in pieces using the 'skip' and 'seek' options.

3.  Download the disk drive manufacturer's diagnostic toolset and run it.  For example:



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