CentOS - Jan 2017 - software raid 1 failure

Hi All,

I had a machine with software RAID-1 have a disk crash. I am attempting to
get the data off the good disk. Using a USB to SATA device I plugged it
into another machine. I tried many things to mount it, to mdadm add it but
could not get it to cooperate.

Another thought I had is can I use fdisk to change the "type" of the
partition from "linux raid" to "linux" and then mount as
normal?

Does that work?
Thanks,

Jerry

On Thu, January 26, 2017 7:27 pm, Jerry Geis wrote:
> Hi All,
>
> I had a machine with software RAID-1 have a disk crash. I am attempting to
> get the data off the good disk.
If only one of two drives of mirror failed, on the original machine you
should be able to mount everything hosted on that RAID (the last will be
running in degraded mode). Why not to copy it from there (using network,
or extra drives attached to that machine)?

Valeri
> Using a USB to SATA device I plugged it
> into another machine. I tried many things to mount it, to mdadm add it but
> could not get it to cooperate.
>
> Another thought I had is can I use fdisk to change the "type" of
the
> partition from "linux raid" to "linux" and then mount
as normal?
>
> Does that work?
> Thanks,
>
> Jerry
> _______________________________________________
> CentOS mailing list
> CentOS at centos.org
> https://lists.centos.org/mailman/listinfo/centos
>

++++++++++++++++++++++++++++++++++++++++
Valeri Galtsev
Sr System Administrator
Department of Astronomy and Astrophysics
Kavli Institute for Cosmological Physics
University of Chicago
Phone: 773-702-4247
++++++++++++++++++++++++++++++++++++++++

On 01/26/2017 05:27 PM, Jerry Geis wrote:
> I tried many things to mount it, to mdadm add it but
> could not get it to cooperate.

You probably want to "mdadm --assemble --scan".  If there were logical
volumes on it, you'd also want to "lvchange -a y" afterward.