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I have a hard drive that is not configured, it shows this in fdisk -l:

Disk /dev/dm-2: 107.4 GB, 107369988096 bytes 
255 heads, 63 sectors/track, 13053 cylinders 
Units = cylinders of 16065 * 512 = 8225280 bytes 
Sector size (logical/physical): 512 bytes / 512 bytes 
I/O size (minimum/optimal): 512 bytes / 512 bytes 
Disk identifier: 0x00000000

How would I configure this, and mount it to /var/t3?

Also how would I make it stay configured in case of a reboot?

dmsetup info /dev/dm-2 output:

Name:              tier3-tier3
State:             ACTIVE
Read Ahead:        256
Tables present:    LIVE
Open count:        0
Event number:      0
Major, minor:      254, 2
Number of targets: 1
UUID: LVM-9CdeuLeSVEJHBbjAJfFYRxxTfYYA0U5khb86NlUcyBAJC1JxP7FIhERCIoInYHLl
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migrated from serverfault.com Jul 3 '13 at 23:17

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2 Answers 2

up vote 4 down vote accepted

This doesn't look like a physical hard drive, more likely it's a LV (Logical Volume) or an encrypted partition or something like that. In any case it's being managed by Device Mapper (hence the /dev/dm- prefix).

Run dmsetup info /dev/dm-2 and post the result here. We'll take it from there.

EDIT: Ok, it's a LVM volume. All you need now is:

  1. Format it (unless it already is formatted)

    mkfs.ext4 -m0 /dev/tier3/tier3
    

    Make sure there are no existing data before formatting.

  2. Add a record to /etc/fstab for after-reboot automatic mount:

    /dev/tier3/tier3  /var/t3   ext4   defaults   1 2
    
  3. Try to mount it:

    mount -a
    df /var/t3
    

    and verify that the first column (Filesystem) shows tier3/tier3 volume

That's it.

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It is a virtual hard drive. I have updated the question with the output. –  Petah Jul 3 '13 at 23:13
    
@Petah - Thx. See my edit above for further steps. –  MLu Jul 3 '13 at 23:37
    
It shows /dev/mapper/tier3-tier3 is that correct? Seemed to work though –  Petah Jul 3 '13 at 23:52
    
Yes that's correct. /dev/tier3/tier3 and /dev/mapper/tier3-tier3 are both symlinks to /dev/dm-2. Congrats, looks like it works :) –  MLu Jul 4 '13 at 0:08
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fdisk /dev/dm-2
n
p
1

Then i forget the next question but you'll want to use all the space you can, I think.

then:

fdisk -l /dev/dm-2

Find the name of the partition and run:

mkfs.ext4 /dev/dm-21 

Or what ever your partition was named.

mount /dev/dm-21 /var/t3
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If it's a LV or something similar you don't want to partition it again. –  MLu Jul 3 '13 at 23:04
    
true enough. I didn't put two and two together with dm && device mapper –  lVlint67 Jul 3 '13 at 23:07
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