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Forum Discussion
NumberFour
Aug 23, 2016Tutor
Reading single disk volume (JBOD) on a computer
Hi everybody, I searched over network but didn't find a clear answer to my question. I would like to configure my NAS with a first RAID volume (let's say volume A) with 3 disks, to prevent from ...
- Oct 22, 2016
It looks like your enclosure can't handle disks > 2 TB.
You might need to get a USB 3 enclosure or SATA->USB adapter.
NumberFour
Oct 22, 2016Tutor
Hi again,
Thanks for the answer.
I tried, but I don't manage to mount the volume...
As I am using a laptop, I don't have sata directly accessible, that's why I'm using an external hard drive box, which is correctly detected as USB to SATA bridge
When I connect it, this is what appears (fdisk -l) :
Disque /dev/sdb : 746,5 GiB, 801569726464 octets, 1565565872 secteurs
Unités : sectors of 1 * 512 = 512 octets
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x00000000
Périphérique Amorçage Start Fin Secteurs Size Id Type
/dev/sdb1 1 4294967295 4294967295 2T ee GPT
It's a 3TB HDD, so I'm surprised not seeing anywhere the size, maybe due to JBOD format ?
And then, here are the results of the different commands I tried :
sudo mount -t btrfs -o ro /dev/sdb1 /mnt
>mount: special device /dev/sdb1 does not exist
sudo mount -t btrfs -o ro /dev/sdb /mnt
>mount: wrong fs type, bad option, bad superblock on /dev/sdb,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
dmesg | tail or so.
sudo mdadm --examine /dev/sdb --scan
sudo mdadm --examine /dev/sdb1 --scan
(There is no output for boty of those commands)
sudo btrfs device scan /dev/sdb
>Scanning for Btrfs filesystems in '/dev/sdb'
>ERROR: device scan failed '/dev/sdb' - Invalid argument
sudo btrfs device scan /dev/sdb1
>ERROR: not a block device: /dev/sdb1
I'm not a linux expert (far from that) and I don't find enough information of how to do it on Internet.
Maybe someone has an idea of what has to be done, or of what I'm doing wrong ?
Thanks in advance for all help !
StephenB
Oct 22, 2016Guru - Experienced User
It looks like your enclosure can't handle disks > 2 TB.
You might need to get a USB 3 enclosure or SATA->USB adapter.
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