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I have a ThinkServer RD440 running RHEL 7.2 with a LSI MegaRAID which is configured as a RAID 10 over 4 disks. It is configured on a partition level, not the raw disks. The root partition is not part of the RAID. For various reasons the original maintainer is no longer available and I don't have the root password. But I need to backup the data because we need the server.

I tried to create a USB drive with Ubuntu 15.10 and boot from it. This works as intended but I cannot mount the partitions that are part of the RAID because mount says it cannot find the superblocks. The disks are 1 TB each and this is what fdisk reports:

Disk /dev/sdb: 931.5 GiB, 1000204886016 bytes, 1953525168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0xe79b4f2
Device    Boot     Start        End    Sectors Size Id Type
/dev/sdb1           2048  209717247  209715200 100G 83 Linux
/dev/sdb2      209717248 3902341119 3692623872 1.7T 83 Linux

Disk /dev/sdc: 931.5 GiB, 1000204886016 bytes, 1953525168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0xe79b4f2
Device    Boot     Start        End    Sectors Size Id Type
/dev/sdc1           2048  209717247  209715200 100G 83 Linux
/dev/sdc2      209717248 3902341119 3692623872 1.7T 83 Linux

Disk /dev/sdd: 931.5 GiB, 1000204886016 bytes, 1953525168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk /dev/sde: 931.5 GiB, 1000204886016 bytes, 1953525168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes

The LSI Software RAID Configuration Utility, that can be accessed at boot time, says that the disks are healthy and are part of the RAID. RHEL also boots without any problem.

Does anybody know how I can get the partitions mounted? Am I missing a driver that RHEL has but Ubuntu doesn't?

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Well, sometimes one is pretty dumb. I generated a new root password with the following command and restarted the server:

openssl passwd -1 newpassword

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