how to mount raid

I have the following funny experiment. I used a live usb to install ubuntu server 12.04 i386 and webmin on a usb plugged to an intel ss4200-e, i would like to make a headless samba server out of it. webmin shows the following situation on the partitions menu:

Disk name Total size Make and model Partitions Actions
SCSI device A 7.39 GB Kingston DataTraveler 3.0 3 Identify drive
SATA device B 953.83 GB ATA Hitachi HDE72101 1 IDE parameters | Identify drive
SATA device C 953.83 GB ATA Hitachi HDE72101 1 IDE parameters | Identify drive
SATA device D 953.83 GB ATA Hitachi HDE72101 1 IDE parameters | Identify drive
SATA device E 953.83 GB ATA Hitachi HDE72101 1 IDE parameters | Identify drive

the raid menu shows:

Device name Status RAID level Usable size Member disk devices
/dev/md0 clean RAID5 (Distributed Parity) 2.60 TB /dev/sdb1 | /dev/sdc1 | /dev/sdd1 | /dev/sde1

and then the \dev\md0 tab shows

Device file /dev/md0
UUID fcf48163:7efca14a:7bb08b15:81161d20
RAID level RAID5 (Distributed Parity)
Filesystem status Used in LVM VG volume
Usable size 2794526208 blocks (2.60 TB)
Persistent superblock? Yes
Layout left-symmetric
Chunk size 128 kB
RAID status clean
Partitions in RAID SATA device B partition 1
SATA device C partition 1
SATA device D partition 1
SATA device E partition 1 

fstab looks like this:

# /etc/fstab: static file system information.
#
# Use 'blkid' to print the universally unique identifier for a
# device; this may be used with UUID= as a more robust way to name devices
# that works even if disks are added and removed. See fstab(5).
#
# <file system> <mount point> <type> <options> <dump> <pass>
proc /proc proc nodev,noexec,nosuid 0 0
# / was on /dev/sdb1 during installation
UUID=437ea85c-1a1a-449f-a87f-e358cce2ba7e / ext2 errors=remount -ro 0 1
# swap was on /dev/sdb5 during installation
UUID=8800da26-a98b-4a6b-aa96-917fc529bfe1 none swap sw 0 0

pvs

 PV VG Fmt Attr PSize PFree /dev/md0 volume lvm2 a- 2,60t 0

how do I mount that /dev/md0 into /mnt/raidarray at boot for example?

1 Answer

Assuming your block device /dev/md0 is formatted, you issue the following command:

sudo blkid /dev/md0

This will give you a UUID and normally will tell you what filesystem it is formatted in.

Then add the following line to your /etc/fstab

UUID=the-uui-blkid-gave-you /mnt/raidarray file-system-you-used defaults 0 0

Afterwards type sudo mount -a and your device should get mounted. Do note that the directory /mnt/raidarray should exist.