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I have a system running ubuntu 13.10, booting from a 50GB SSD. Attached to the motherboard are also three 2TB disks. configured into a 4TB RAID array. After ubuntu boots, I can mount the RAD volume successfully with:

sudo mount /dev/vg1/lv1 /data

after which I can access the files in the array in /data

I am uncertain as to how to get this mounting process to happen automatically during booting, however. I tried the "Disks" GUI program without success.

I have seen posts mentioning how I should edit fstab and/or mdadm.conf, but I have not seen any really clear instructions regarding exactly what lines to add to either of these files.

I don't remember how the three 2TB disks were setup, formatted, etc. to become a RAID volume. I vaguely recall that both mdadm and Logical Volume Manager were used, but it was a long time ago. So when I see instructions requiring me to know how the disks are formatted, I am stuck. All I really know for sure is that the above command works.

Any pointers to really clear, noob-level instructions for me?

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2 Answers 2

Your array is probably reassembled either automatically (by looking at the metadata on the disks) or in the /etc/mdadm/mdadm.conf file.

LVM, which lives on top of that, is initialized automatically as well.

To just have a certain volume mounted at boot is simply adding an entry in /etc/fstab, e.g.:

/dev/vgname/lvname      /path/to/mountpoint     ext4    defaults         0      2

Read the fstab(5) manpage for more information on the exact settings (man fstab). This example is of an ext4 filesystem with all default settings for a file system without dependencies for booting up (nothing related to /usr, /lib or something like that).

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Put

mount /dev/vg1/lv1 /data

into

/etc/rc.local

Make sure it is between lines

#!/bin/sh -e

and

exit 0

and does not have a # in front of it. That should mount it on boot.

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1  
Mounting a volume from /etc/rc.local (or any other script run at boot) is not the way. Really. –  gertvdijk Dec 23 '13 at 19:09

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