From mboxrd@z Thu Jan  1 00:00:00 1970
From: "John Stoffel" <john@stoffel.org>
Subject: Re: Can't mount /dev/md0 Raid5
Date: Wed, 11 Oct 2017 15:49:09 -0400
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To: Mikael Abrahamsson <swmike@swm.pp.se>
Cc: Joseba Ibarra <wajalotnet@gmail.com>, Adam Goryachev <adam@websitemanagers.com.au>, Rudy Zijlstra <rudy@grumpydevil.homelinux.org>, list linux-raid <linux-raid@vger.kernel.org>
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>>>>> "Mikael" == Mikael Abrahamsson <swmike@swm.pp.se> writes:

Mikael> On Wed, 11 Oct 2017, Joseba Ibarra wrote:
>> Now I see the RAID, however can't be mounted. So, I'm not sure how to backup 
>> the data. Gparted shows the partition /dev/md0p1 with the used and free 
>> space.

Mikael> Do you know what file system you had? Looks like next step is to try to 
Mikael> run fsck -n (read-only) on md0 and/or md0p1.

Mikael> What does /etc/fstab contain regarding md0?

Did you have the RAID5 setup as a PV inside a VG?  What does:

    vgscan

give you back when you run it as root?